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Rev | Author | Line No. | Line |
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110 | heavyiron | 1 | --------p-155300----------------------------- |
2 | INT 15 - Advanced Power Management v1.0+ - INSTALLATION CHECK |
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3 | AX = 5300h |
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4 | BX = device ID of system BIOS (0000h) |
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5 | Return: CF clear if successful |
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6 | AH = major version (BCD) |
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7 | AL = minor version (BCD) |
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8 | BX = 504Dh ("PM") |
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9 | CX = flags (see #00472) |
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10 | CF set on error |
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11 | AH = error code (06h,09h,86h) (see #00473) |
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12 | BUG: early versions of the Award Modular BIOS with built-in APM support |
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13 | reportedly do not set BX on return |
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14 | |||
15 | Bitfields for APM flags: |
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16 | Bit(s) Description (Table 00472) |
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17 | |||
18 | 1 32-bit protected mode interface supported |
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19 | 2 CPU idle call reduces processor speed |
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20 | 3 BIOS power management disabled |
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21 | 4 BIOS power management disengaged (APM v1.1) |
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22 | 5-7 reserved |
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23 | |||
24 | (Table 00473) |
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25 | Values for APM error code: |
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26 | 01h power management functionality disabled |
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27 | 02h interface connection already in effect |
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28 | 03h interface not connected |
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29 | 04h real-mode interface not connected |
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30 | 05h 16-bit protected-mode interface already connected |
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31 | 06h 16-bit protected-mode interface not supported |
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32 | 07h 32-bit protected-mode interface already connected |
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33 | 08h 32-bit protected-mode interface not supported |
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34 | 09h unrecognized device ID |
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35 | 0Ah invalid parameter value in CX |
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36 | 0Bh (APM v1.1) interface not engaged |
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37 | 0Ch (APM v1.2) function not supported |
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38 | 0Dh (APM v1.2) Resume Timer disabled |
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39 | 0Eh-1Fh reserved for other interface and general errors |
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40 | 20h-3Fh reserved for CPU errors |
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41 | 40h-5Fh reserved for device errors |
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42 | 60h can't enter requested state |
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43 | 61h-7Fh reserved for other system errors |
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44 | 80h no power management events pending |
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45 | 81h-85h reserved for other power management event errors |
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46 | 86h APM not present |
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47 | 87h-9Fh reserved for other power management event errors |
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48 | A0h-FEh reserved |
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49 | FFh undefined |
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50 | --------p-155301----------------------------- |
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51 | INT 15 - Advanced Power Management v1.0+ - CONNECT REAL-MODE INTERFACE |
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52 | AX = 5301h |
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53 | BX = device ID of system BIOS (0000h) |
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54 | Return: CF clear if successful |
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55 | CF set on error |
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56 | AH = error code (02h,05h,07h,09h) (see #00473) |
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57 | Note: on connection, an APM v1.1 or v1.2 BIOS switches to APM v1.0 |
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58 | compatibility mode until it is informed that the user supports a |
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59 | newer version of APM (see AX=530Eh) |
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60 | SeeAlso: AX=5302h,AX=5303h,AX=5304h |
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61 | --------p-155302----------------------------- |
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62 | INT 15 R - Advanced Power Management v1.0+ - CONNECT 16-BIT PROTMODE INTERFACE |
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63 | AX = 5302h |
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64 | BX = device ID of system BIOS (0000h) |
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65 | Return: CF clear if successful |
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66 | AX = real-mode segment base address of protected-mode 16-bit code |
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67 | segment |
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68 | BX = offset of entry point |
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69 | CX = real-mode segment base address of protected-mode 16-bit data |
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70 | segment |
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71 | ---APM v1.1--- |
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72 | SI = APM BIOS code segment length |
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73 | DI = APM BIOS data segment length |
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74 | CF set on error |
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75 | AH = error code (02h,05h,06h,07h,09h) (see #00473) |
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76 | Notes: the caller must initialize two consecutive descriptors with the |
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77 | returned segment base addresses; these descriptors must be valid |
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78 | whenever the protected-mode interface is called, and will have |
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79 | their limits arbitrarily set to 64K. |
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80 | the protected mode interface is invoked by making a far call with the |
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81 | same register values as for INT 15; it must be invoked while CPL=0, |
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82 | the code segment descriptor must have a DPL of 0, the stack must be |
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83 | in a 16-bit segment and have enough room for BIOS use and possible |
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84 | interrupts, and the current I/O permission bit map must allow access |
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85 | to the I/O ports used for power management. |
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86 | functions 00h-03h are not available from protected mode |
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87 | on connection, an APM v1.1 or v1.2 BIOS switches to APM v1.0 |
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88 | compatibility mode until it is informed that the user supports a |
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89 | newer version of APM (see AX=530Eh) |
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90 | SeeAlso: AX=5301h,AX=5303h,AX=5304h |
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91 | --------p-155303----------------------------- |
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92 | INT 15 - Advanced Power Management v1.0+ - CONNECT 32-BIT PROTMODE INTERFACE |
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93 | AX = 5303h |
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94 | BX = device ID of system BIOS (0000h) |
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95 | Return: CF clear if successful |
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96 | AX = real-mode segment base address of protected-mode 32-bit code |
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97 | segment |
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98 | EBX = offset of entry point |
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99 | CX = real-mode segment base address of protected-mode 16-bit code |
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100 | segment |
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101 | DX = real-mode segment base address of protected-mode 16-bit data |
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102 | segment |
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103 | ---APM v1.1--- |
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104 | SI = APM BIOS code segment length |
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105 | DI = APM BIOS data segment length |
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106 | CF set on error |
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107 | AH = error code (02h,05h,07h,08h,09h) (see #00473) |
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108 | Notes: the caller must initialize three consecutive descriptors with the |
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109 | returned segment base addresses for 32-bit code, 16-bit code, and |
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110 | 16-bit data, respectively; these descriptors must be valid whenever |
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111 | the protected-mode interface is called, and will have their limits |
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112 | arbitrarily set to 64K. |
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113 | the protected mode interface is invoked by making a far call to the |
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114 | 32-bit code segment with the same register values as for INT 15; it |
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115 | must be invoked while CPL=0, the code segment descriptor must have a |
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116 | DPL of 0, the stack must be in a 32-bit segment and have enough room |
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117 | for BIOS use and possible interrupts, and the current I/O permission |
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118 | bit map must allow access to the I/O ports used for power management. |
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119 | functions 00h-03h are not available from protected mode |
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120 | on connection, an APM v1.1 or v1.2 BIOS switches to APM v1.0 |
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121 | compatibility mode until it is informed that the user supports a |
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122 | newer version of APM (see AX=530Eh) |
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123 | SeeAlso: AX=5301h,AX=5302h,AX=5304h |
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124 | --------p-155304----------------------------- |
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125 | INT 15 - Advanced Power Management v1.0+ - DISCONNECT INTERFACE |
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126 | AX = 5304h |
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127 | BX = device ID of system BIOS (0000h) |
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128 | Return: CF clear if successful |
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129 | CF set on error |
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130 | AH = error code (03h,09h) (see #00473) |
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131 | SeeAlso: AX=5301h,AX=5302h,AX=5303h |
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132 | --------p-155305----------------------------- |
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133 | INT 15 - Advanced Power Management v1.0+ - CPU IDLE |
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134 | AX = 5305h |
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135 | Return: CF clear if successful (after system leaves idle state) |
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136 | CF set on error |
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137 | AH = error code (03h,0Bh) (see #00473) |
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138 | Notes: call when the system is idle and should be suspended until the next |
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139 | system event or interrupt |
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140 | should not be called from within a hardware interrupt handler to avoid |
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141 | reentrance problems |
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142 | if an interrupt causes the system to resume normal processing, the |
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143 | interrupt may or may not have been handled when the BIOS returns |
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144 | from this call; thus, the caller should allow interrupts on return |
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145 | interrupt handlers may not retain control if the BIOS allows |
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146 | interrupts while in idle mode even if they are able to determine |
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147 | that they were called from idle mode |
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148 | the caller should issue this call continuously in a loop until it needs |
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149 | to perform some processing of its own |
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150 | SeeAlso: AX=1000h,AX=5306h,INT 2F/AX=1680h |
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151 | --------p-155306----------------------------- |
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152 | INT 15 - Advanced Power Management v1.0+ - CPU BUSY |
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153 | AX = 5306h |
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154 | Return: CF clear if successful |
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155 | CF set on error |
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156 | AH = error code (03h,0Bh) (see #00473) |
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157 | Notes: called to ensure that the system runs at full speed even on systems |
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158 | where the BIOS is unable to recognize increased activity (especially |
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159 | if interrupts are hooked by other programs and not chained to the |
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160 | BIOS) |
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161 | this call may be made even when the system is already running at full |
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162 | speed, but it will create unnecessary overhead |
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163 | should not be called from within a hardware interrupt handler to avoid |
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164 | reentrance problems |
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165 | SeeAlso: AX=5305h |
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166 | --------p-155307----------------------------- |
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167 | INT 15 - Advanced Power Management v1.0+ - SET POWER STATE |
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168 | AX = 5307h |
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169 | BX = device ID (see #00474) |
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170 | CX = system state ID (see #00475) |
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171 | Return: CF clear if successful |
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172 | CF set on error |
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173 | AH = error code (01h,03h,09h,0Ah,0Bh,60h) (see #00473) |
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174 | Note: should not be called from within a hardware interrupt handler to avoid |
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175 | reentrance problems |
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176 | SeeAlso: AX=530Ch |
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177 | |||
178 | (Table 00474) |
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179 | Values for APM device IDs: |
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180 | 0000h system BIOS |
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181 | 0001h all devices for which the system BIOS manages power |
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182 | 01xxh display (01FFh for all attached display devices) |
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183 | 02xxh secondary storage (02FFh for all attached secondary storage devices) |
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184 | 03xxh parallel ports (03FFh for all attached parallel ports) |
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185 | 04xxh serial ports (04FFh for all attached serial ports) |
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186 | ---APM v1.1+ --- |
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187 | 05xxh network adapters (05FFh for all attached network adapters) |
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188 | 06xxh PCMCIA sockets (06FFh for all) |
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189 | 0700h-7FFFh reserved |
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190 | 80xxh system battery devices (APM v1.2) |
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191 | 8100h-DFFFh reserved |
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192 | Exxxh OEM-defined power device IDs |
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193 | F000h-FFFFh reserved |
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194 | |||
195 | (Table 00475) |
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196 | Values for system state ID: |
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197 | 0000h ready (not supported for device ID 0001h) |
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198 | 0001h stand-by |
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199 | 0002h suspend |
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200 | 0003h off (not supported for device ID 0001h in APM v1.0) |
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201 | ---APM v1.1--- |
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202 | 0004h last request processing notification (only for device ID 0001h) |
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203 | 0005h last request rejected (only for device ID 0001h) |
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204 | 0006h-001Fh reserved system states |
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205 | 0020h-003Fh OEM-defined system states |
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206 | 0040h-007Fh OEM-defined device states |
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207 | 0080h-FFFFh reserved device states |
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208 | --------p-155307CX0001----------------------- |
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209 | INT 15 - Advanced Power Management v1.0+ - SYSTEM STAND-BY |
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210 | AX = 5307h |
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211 | CX = 0001h |
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212 | BX = 0001h (device ID for all power-managed devices) |
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213 | Return: CF clear |
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214 | Notes: puts the entire system into stand-by mode; normally called in response |
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215 | to a System Stand-by Request notification after any necessary |
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216 | processing, but may also be invoked at the caller's discretion |
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217 | should not be called from within a hardware interrupt handler to avoid |
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218 | reentrance problems |
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219 | the stand-by state is typically exited on an interrupt |
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220 | SeeAlso: AX=4280h,AX=5307h/CX=0002h"SUSPEND",AX=5307h/CX=0003h,AX=530Bh |
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221 | --------p-155307CX0002----------------------- |
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222 | INT 15 - Advanced Power Management v1.0+ - SUSPEND SYSTEM |
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223 | AX = 5307h |
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224 | CX = 0002h |
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225 | BX = 0001h (device ID for all power-managed devices) |
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226 | Return: after system is resumed |
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227 | CF clear |
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228 | Notes: puts the entire system into a low-power suspended state; normally |
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229 | called in response to a Suspend System Request notification after |
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230 | any necessary processing, but may also be invoked at the caller's |
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231 | discretion |
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232 | should not be called from within a hardware interrupt handler to avoid |
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233 | reentrance problems |
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234 | the caller may need to update its date and time values because the |
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235 | system could have been suspended for a long period of time |
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236 | SeeAlso: AX=5307h/CX=0001h"STAND-BY",AX=530Bh |
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237 | --------p-155307CX0003----------------------- |
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238 | INT 15 - Advanced Power Management v1.2 - TURN OFF SYSTEM |
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239 | AX = 5307h |
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240 | CX = 0003h |
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241 | BX = 0001h (device ID for all power-managed devices) |
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242 | Return: after system is resumed |
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243 | CF clear |
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244 | Notes: if supported by the system's power supply, turns off the system power |
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245 | SeeAlso: AX=5307h/CX=0001h"STAND-BY",AX=530Bh |
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246 | --------p-155308----------------------------- |
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247 | INT 15 - Advanced Power Management v1.0+ - ENABLE/DISABLE POWER MANAGEMENT |
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248 | AX = 5308h |
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249 | BX = device ID for all devices power-managed by APM |
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250 | 0001h (APM v1.1+) |
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251 | FFFFh (APM v1.0) |
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252 | CX = new state |
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253 | 0000h disabled |
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254 | 0001h enabled |
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255 | Return: CF clear if successful |
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256 | CF set on error |
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257 | AH = error code (01h,03h,09h,0Ah,0Bh) (see #00473) |
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258 | Notes: when power management is disabled, the system BIOS will not |
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259 | automatically power down devices, enter stand-by or suspended mode, |
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260 | or perform any power-saving actions in response to AX=5305h calls |
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261 | should not be called from within a hardware interrupt handler to avoid |
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262 | reentrance problems |
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263 | the APM BIOS should never be both disabled and disengaged at the same |
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264 | time |
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265 | SeeAlso: AX=5309h,AX=530Dh,AX=530Fh |
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266 | --------p-155309----------------------------- |
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267 | INT 15 - Advanced Power Management v1.0+ - RESTORE POWER-ON DEFAULTS |
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268 | AX = 5309h |
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269 | BX = device ID for all devices power-managed by APM |
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270 | 0001h (APM v1.1) |
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271 | FFFFh (APM v1.0) |
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272 | Return: CF clear if successful |
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273 | CF set on error |
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274 | AH = error code (03h,09h,0Bh) (see #00473) |
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275 | Note: should not be called from within a hardware interrupt handler to avoid |
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276 | reentrance problems |
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277 | SeeAlso: AX=5308h |
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278 | --------p-15530A----------------------------- |
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279 | INT 15 - Advanced Power Management v1.0+ - GET POWER STATUS |
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280 | AX = 530Ah |
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281 | BX = device ID |
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282 | 0001h all devices power-managed by APM |
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283 | 80xxh specific battery unit number XXh (01h-FFh) (APM v1.2) |
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284 | Return: CF clear if successful |
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285 | BH = AC line status |
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286 | 00h off-line |
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287 | 01h on-line |
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288 | 02h on backup power (APM v1.1) |
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289 | FFh unknown |
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290 | other reserved |
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291 | BL = battery status (see #00476) |
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292 | CH = battery flag (APM v1.1+) (see #00477) |
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293 | CL = remaining battery life, percentage |
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294 | 00h-64h (0-100) percentage of full charge |
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295 | FFh unknown |
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296 | DX = remaining battery life, time (APM v1.1) (see #00478) |
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297 | ---if specific battery unit specified--- |
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298 | SI = number of battery units currently installed |
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299 | CF set on error |
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300 | AH = error code (09h,0Ah) (see #00473) |
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301 | Notes: should not be called from within a hardware interrupt handler to avoid |
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302 | reentrance problems |
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303 | supported in real mode (INT 15) and both 16-bit and 32-bit protected |
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304 | mode |
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305 | |||
306 | (Table 00476) |
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307 | Values for APM v1.0+ battery status: |
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308 | 00h high |
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309 | 01h low |
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310 | 02h critical |
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311 | 03h charging |
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312 | FFh unknown |
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313 | other reserved |
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314 | SeeAlso: #00477,#00478 |
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315 | |||
316 | Bitfields for APM v1.1+ battery flag: |
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317 | Bit(s) Description (Table 00477) |
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318 | |||
319 | 1 low |
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320 | 2 critical |
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321 | 3 charging |
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322 | 4 selected battery not present (APM v1.2) |
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323 | 5-6 reserved (0) |
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324 | 7 no system battery |
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325 | Note: all bits set (FFh) if unknown |
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326 | SeeAlso: #00476,#00478 |
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327 | |||
328 | Bitfields for APM v1.1+ remaining battery life: |
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329 | Bit(s) Description (Table 00478) |
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330 | 15 time units: 0=seconds, 1=minutes |
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331 | 14-0 battery life in minutes or seconds |
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332 | Note: all bits set (FFFFh) if unknown |
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333 | SeeAlso: #00476,#00477 |
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334 | --------p-15530B----------------------------- |
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335 | INT 15 - Advanced Power Management v1.0+ - GET POWER MANAGEMENT EVENT |
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336 | AX = 530Bh |
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337 | Return: CF clear if successful |
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338 | BX = event code (see #00479) |
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339 | CX = event information (APM v1.2) if BX=0003h or BX=0004h |
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340 | bit 0: PCMCIA socket was powered down in suspend state |
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341 | CF set on error |
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342 | AH = error code (03h,0Bh,80h) (see #00473) |
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343 | Notes: although power management events are often asynchronous, notification |
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344 | will not be made until polled via this call to permit software to |
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345 | only receive event notification when it is prepared to process |
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346 | power management events; since these events are not very time- |
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347 | critical, it should be sufficient to poll once or twice per second |
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348 | the critical resume notification is made after the system resumes |
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349 | from an emergency suspension; normally, the system BIOS only notifies |
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350 | its partner that it wishes to suspend and relies on the partner to |
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351 | actually request the suspension, but no notification is made on an |
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352 | emergency suspension |
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353 | should not be called from within a hardware interrupt handler to avoid |
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354 | reentrance problems |
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355 | SeeAlso: AX=5307h,AX=5307h/CX=0001h"STAND-BY",AX=5307h/CX=0002h"SUSPEND" |
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356 | |||
357 | (Table 00479) |
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358 | Values for APM event code: |
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359 | 0001h system stand-by request |
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360 | 0002h system suspend request |
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361 | 0003h normal resume system notification |
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362 | 0004h critical resume system notification |
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363 | 0005h battery low notification |
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364 | ---APM v1.1--- |
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365 | 0006h power status change notification |
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366 | 0007h update time notification |
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367 | 0008h critical system suspend notification |
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368 | 0009h user system standby request notification |
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369 | 000Ah user system suspend request notification |
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370 | 000Bh system standby resume notification |
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371 | ---APM v1.2--- |
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372 | 000Ch capabilities change notification (see AX=5310h) |
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373 | ------ |
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374 | 000Dh-00FFh reserved system events |
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375 | 01xxh reserved device events |
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376 | 02xxh OEM-defined APM events |
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377 | 0300h-FFFFh reserved |
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378 | --------p-15530C----------------------------- |
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379 | INT 15 - Advanced Power Management v1.1+ - GET POWER STATE |
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380 | AX = 530Ch |
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381 | BX = device ID (see #00474) |
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382 | Return: CF clear if successful |
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383 | CX = system state ID (see #00475) |
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384 | CF set on error |
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385 | AH = error code (01h,09h) (see #00473) |
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386 | SeeAlso: AX=5307h |
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387 | --------p-15530D----------------------------- |
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388 | INT 15 - Advanced Power Management v1.1+ - EN/DISABLE DEVICE POWER MANAGEMENT |
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389 | AX = 530Dh |
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390 | BX = device ID (see #00474) |
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391 | CX = function |
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392 | 0000h disable power management |
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393 | 0001h enable power management |
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394 | Return: CF clear if successful |
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395 | CF set on error |
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396 | AH = error code (01h,03h,09h,0Ah,0Bh) (see #00473) |
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397 | Desc: specify whether automatic power management should be active for a |
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398 | given device |
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399 | SeeAlso: AX=5308h,AX=530Fh |
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400 | --------p-15530E----------------------------- |
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401 | INT 15 - Advanced Power Management v1.1+ - DRIVER VERSION |
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402 | AX = 530Eh |
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403 | BX = device ID of system BIOS (0000h) |
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404 | CH = APM driver major version (BCD) |
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405 | CL = APM driver minor version (BCD) (02h for APM v1.2) |
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406 | Return: CF clear if successful |
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407 | AH = APM connection major version (BCD) |
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408 | AL = APM connection minor version (BCD) |
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409 | CF set on error |
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410 | AH = error code (03h,09h,0Bh) (see #00473) |
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411 | SeeAlso: AX=5300h,AX=5303h |
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412 | --------p-15530F----------------------------- |
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413 | INT 15 - Advanced Power Management v1.1+ - ENGAGE/DISENGAGE POWER MANAGEMENT |
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414 | AX = 530Fh |
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415 | BX = device ID (see #00474) |
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416 | CX = function |
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417 | 0000h disengage power management |
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418 | 0001h engage power management |
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419 | Return: CF clear if successful |
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420 | CF set on error |
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421 | AH = error code (01h,09h) (see #00473) |
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422 | Notes: unlike AX=5308h, this call does not affect the functioning of the APM |
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423 | BIOS |
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424 | when cooperative power management is disengaged, the APM BIOS performs |
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425 | automatic power management of the system or device |
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426 | SeeAlso: AX=5308h,AX=530Dh |
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427 | --------p-155310----------------------------- |
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428 | INT 15 - Advanced Power Management v1.2 - GET CAPABILITIES |
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429 | AX = 5310h |
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430 | BX = device ID (see #00474) |
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431 | 0000h (APM BIOS) |
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432 | other reserved |
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433 | Return: CF clear if successful |
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434 | BL = number of battery units supported (00h if no system batteries) |
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435 | CX = capabilities flags (see #00480) |
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436 | CF set on error |
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437 | AH = error code (01h,09h,86h) (see #00473) |
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438 | Notes: this function is supported via the INT 15, 16-bit protected mode, and |
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439 | 32-bit protected mode interfaces; it does not require that a |
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440 | connection be established prior to use |
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441 | this function will return the capabilities currently in effect, not |
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442 | any new settings which have been made but do not take effect until |
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443 | a system restart |
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444 | SeeAlso: AX=5300h,AX=530Fh,AX=5311h,AX=5312h,AX=5313h |
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445 | |||
446 | Bitfields for APM v1.2 capabilities flags: |
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447 | Bit(s) Description (Table 00480) |
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448 | 15-8 reserved |
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449 | 7 PCMCIA Ring Indicator will wake up system from suspend mode |
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450 | 6 PCMCIA Ring Indicator will wake up system from standby mode |
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451 | 5 Resume on Ring Indicator will wake up system from suspend mode |
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452 | 4 Resume on Ring Indicator will wake up system from standby mode |
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453 | 3 resume timer will wake up system from suspend mode |
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454 | 2 resume timer will wake up system from standby mode |
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455 | 1 can enter global suspend state |
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456 | |||
457 | --------p-155311----------------------------- |
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458 | INT 15 - Advanced Power Management v1.2 - GET/SET/DISABLE RESUME TIMER |
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459 | AX = 5311h |
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460 | BX = device ID (see #00474) |
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461 | 0000h (APM BIOS) |
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462 | other reserved |
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463 | CL = function |
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464 | 00h disable Resume Timer |
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465 | 01h get Resume Timer |
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466 | 02h set Resume Timer |
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467 | CH = resume time, seconds (BCD) |
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468 | DL = resume time, minutes (BCD) |
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469 | DH = resume time, hours (BCD) |
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470 | SI = resume date (BCD), high byte = month, low byte = day |
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471 | DI = resume date, year (BCD) |
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472 | Return: CF clear if successful |
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473 | ---if getting timer--- |
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474 | CH = resume time, seconds (BCD) |
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475 | DL = resume time, minutes (BCD) |
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476 | DH = resume time, hours (BCD) |
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477 | SI = resume date (BCD), high byte = month, low byte = day |
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478 | DI = resume date, year (BCD) |
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479 | CF set on error |
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480 | AH = error code (03h,09h,0Ah,0Bh,0Ch,0Dh,86h) (see #00473) |
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481 | Notes: this function is supported via the INT 15, 16-bit protected mode, and |
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482 | 32-bit protected mode interfaces |
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483 | SeeAlso: AX=5300h,AX=5310h,AX=5312h,AX=5313h |
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484 | --------p-155312----------------------------- |
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485 | INT 15 - Advanced Power Management v1.2 - ENABLE/DISABLE RESUME ON RING |
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486 | AX = 5312h |
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487 | BX = device ID (see #00474) |
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488 | 0000h (APM BIOS) |
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489 | other reserved |
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490 | CL = function |
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491 | 00h disable Resume on Ring Indicator |
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492 | 01h enable Resume on Ring Indicator |
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493 | 02h get Resume on Ring Indicator status |
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494 | Return: CF clear if successful |
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495 | CX = resume status (0000h disabled, 0001h enabled) |
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496 | CF set on error |
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497 | AH = error code (03h,09h,0Ah,0Bh,0Ch,86h) (see #00473) |
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498 | Notes: this function is supported via the INT 15, 16-bit protected mode, and |
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499 | 32-bit protected mode interfaces |
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500 | SeeAlso: AX=5300h,AX=5310h,AX=5311h,AX=5313h |
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501 | --------p-155313----------------------------- |
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502 | INT 15 - Advanced Power Management v1.2 - ENABLE/DISABLE TIMER-BASED REQUESTS |
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503 | AX = 5313h |
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504 | BX = device ID (see #00474) |
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505 | 0000h (APM BIOS) |
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506 | other reserved |
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507 | CL = function |
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508 | 00h disable timer-based requests |
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509 | 01h enable timer-based requests |
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510 | 02h get timer-based requests status |
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511 | Return: CF clear if successful |
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512 | CX = timer-based requests status (0000h disabled, 0001h enabled) |
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513 | CF set on error |
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514 | AH = error code (03h,09h,0Ah,0Bh,86h) (see #00473) |
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515 | Notes: this function is supported via the INT 15, 16-bit protected mode, and |
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516 | 32-bit protected mode interfaces |
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517 | some BIOSes set AH on return even when successful |
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518 | SeeAlso: AX=5300h,AX=5310h,AX=5311h,AX=5312h |