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Function 21

and its subfunctions (1,2,5,11,12)

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'>Subfunction

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'> 1 - set the base port MPU MIDI

Options:

  * eax =

21 - function number

  * ebx = 1

- number of subfunction

  * ecx =

base port number

Return value:

  * eax = 0

- successful

  * eax =

-1 - wrong port number

Remarks:

style='mso-spacerun:yes'> The port number must satisfy the conditions

0x100 <= ecx <= 0xFFFF.

 Base installation is

necessary for the operation of function 20.

 You can get the installed

base port by calling subfunctions 1 

class=GramE>functions 26.

Constants for registers:

  eax -

SF_SYSTEM_SET (21)

  ebx -

SSF_MPU_MIDI_BASE (1)

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'>Subfunction

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'> 2 - set keyboard layout

The keyboard layout is used to convert scancodes

coming from the keyboard into ASCII codes readable by function 2.

Options:

  * eax =

21 - function number

  * ebx = 2

- subfunction number

  * ecx =

which layout to install:

    * 1 = normal

    * 2 = layout when Shift is pressed

    * 3 = Layout while pressing Alt

  * edx =

pointer to layout - 128 bytes table

Or:

  * ecx = 9

  * dx = country identifier (1 = 

class=SpellE>eng, 2 = fi, 3 = ger, 4 = 

class=SpellE>rus)

Return value:

  * eax = 0

- successful

  * eax = 1

- the parameter is set incorrectly

Remarks:

  * If Alt is pressed,

then the Alt; if Alt is not pressed, but Shift is pressed, then the layout with

Shift is used; if Alt and Shift are not pressed, but Ctrl is pressed, then the

normal layout is used, after which 0x60 is subtracted from the code; if none of

the control keys are pressed, then the normal layout is used.

  * You can get layouts

and country identifiers using subfunction 2 of

function 26.

  * Country Identifier

- a global system variable that is not used by the kernel itself; however, the

@taskbar application displays an icon corresponding to the current country.

  * The @taskbar application

switches layouts on user request.

Constants for registers:

  eax -

SF_SYSTEM_SET (21)

  ebx -

SSF_KEYBOARD_LAYOUT (2)

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'>Subfunction

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'> 5 - set the system language

Options:

  * eax =

21 - function number

  * ebx = 5

- subfunction number

  * ecx = system

language (1 = eng, 2 = fi, 3 = ger,

4 = rus)

Return value:

  * eax = 0

Remarks:

  The system language

is a global system variable that is not used by the kernel itself,

however, the @taskbar application draws the corresponding icon.

Checks for correctness are not

done, because the kernel does not use this variable.

You can get the system language

by calling subfunction 5 of function 26.

Constants for registers:

  eax -

SF_SYSTEM_SET (21)

  ebx -

SSF_SYS_LANG (5)

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'>Subfunction

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'> 11 - Allow / block low-level access to HD

Options:

  * eax =

21 - function number

  * ebx =

11 - number of subfunction

  * ecx =

0/1 - disable / allow

Return value:

  * eax = 0

Remarks:

 Used in

LBA reading (subfunction 8 of function 58).

 The current implementation

uses only the low bit ecx.

 You can get the current

status by calling subfunction 11 of function 26.

Constants for registers:

  eax -

SF_SYSTEM_SET (21)

  ebx -

SSF_ACCESS_HD_LBA (11)

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'>Subfunction

lang=EN-US style='font-size:14.0pt;font-family:"Arial","sans-serif";mso-ansi-language:

EN-US'> 12 - Allow / block low-level access to PCI

style='mso-bidi-font-weight:normal'>

Options:

   * eax =

21 - function number

   * ebx =

12 - subfunction number

   * ecx =

0/1 - disable / allow

Return value:

   * eax =

0

Remarks:

   Used when working

with the PCI bus (function 62).

   The current

implementation uses only the low bit ecx.

   You can get the

current status by calling subfunction 12 of function

26.

Constants for registers:

   eax -

SF_SYSTEM_SET (21)

   ebx

style='font-family:"Arial","sans-serif"'> - SSF_ACCESS_PCI (12)