51,20 → 51,18 |
; get number in range [bl,bh] (bl,bh in ['0'..'9']) |
; in: bx=range |
; out: ax=digit (1..9, 10 for 0) |
mov ah, 0 ; If 'int 16h' is called with 'ah' equal to zero, the BIOS will not return control to the caller |
int 16h ; until a key is available in the system type ahead buffer. On return, 'al' contains the ASCII |
cmp al, 27 ; code for the key read from the buffer and 'ah' contains the keyboard scan code. (27=>ESC) |
jz @f ; If ESC is pressed, return (user doesn't want to change any value). |
cmp al, bl ; Compare 'al' (ASCII code of key pressed) with 'bl' (lowest accepted char from the range). |
jb getkey ; ASCII code is below lowest accepted value => continue waiting for another key. |
cmp al, bh ; Compare 'al' (ASCII code of key pressed) with 'bh' (highest accepted char from the range). |
ja getkey ; ASCII code is above highest accepted value => continue waiting for another key. |
mov ah, 0 ; If 'int 16h' is called with 'ah' equal to zero, the BIOS will not return control |
int 16h ; to the caller until a key is available in the system type ahead buffer. On return, |
cmp al, bl ; 'al' contains the ASCII code for the key read from the buffer and 'ah' contains |
jb getkey ; the keyboard scan code. Here we compare 'al' with the range of accepted characters. |
cmp al, bh ; If the key pressed is not in the range, continue waiting for another key. |
ja getkey |
push ax ; If the pressed key is in the accepted range, save it on the stack and echo to screen. |
call putchar |
pop ax |
and ax, 0Fh ; Convert ASCII code to number: '1'->1, '2'->2, etc. 0Fh=1111b. |
jnz @f ; ASCII code for '0' is 48 (110000b). (110000b AND 1111b) = 0 |
mov al, 10 ; So if key '0' was entered, return 10 in 'ax' |
and ax, 0Fh ; ASCII code for '0' is 48 (110000b). 0F4=1111b. (110000b AND 1111b) = 0 |
jnz @f ; So if key '0' was entered, return 10 in 'ax' |
mov al, 10 |
@@: |
ret |
|
81,18 → 79,6 |
call setcursor |
} |
|
macro _ask_question question,range,variable_to_set |
{ |
_setcursor 16,0 |
mov si, question ; Print the question |
call print |
mov bx, range ; range accepted for answer |
call getkey |
cmp al, 27 ; If ESC was pressed, do not change the value |
jz .esc_pressed |
mov [variable_to_set], al |
} |
|
boot_read_floppy: |
push si |
xor si, si |
789,21 → 775,23 |
cmp al, 'e' ; select boot origin |
jnz .show_remarks |
; e) preboot_device = from where to boot? |
_setcursor 16,0 |
mov si, bdev |
call print |
if defined extended_primary_loader |
_ask_question bdev,'12',preboot_device ; range accepted for answer: 1-2 |
mov bx, '12' ; range accepted for answer: 1-2 |
else |
_ask_question bdev,'14',preboot_device ; range accepted for answer: 1-4 |
mov bx, '14' ; range accepted for answer: 1-4 |
end if |
call getkey |
mov [preboot_device], al |
_setcursor 14,0 |
|
.d: |
if ~ defined extended_primary_loader |
mov [.bSettingsChanged], 1 |
end if |
.esc_pressed: |
call clear_vmodes_table ;clear vmodes_table |
jmp .printcfg |
|
.change_a: |
call clear_vmodes_table ;clear vmodes_table |
.loops: |
815,9 → 803,6 |
|
mov si, word [cursor_pos] |
|
cmp al, 27 ; If ESC was pressed, do not change the value |
jz .esc_pressed ; Just exit the resolution selection box |
|
cmp ah, 0x48;x,0x48E0 ; up |
jne .down |
cmp si, modes_table |
888,13 → 873,17 |
jmp .d |
|
.change_b: ; b) preboot_biosdisk = use BIOS disks through V86 emulation? |
; _setcursor 16,0 |
_setcursor 16,0 |
; mov si, ask_dma // (earlier was: preboot_dma = use DMA access?) |
; call print |
; mov bx, '13' ; range accepted for answer: 1-3 |
; call getkey |
; mov [preboot_dma], al |
_ask_question ask_bd,'12',preboot_biosdisk ; range accepted for answer: 1-2 |
mov si, ask_bd |
call print |
mov bx, '12' ; range accepted for answer: 1-2 |
call getkey |
mov [preboot_biosdisk], al |
_setcursor 11,0 |
jmp .d |
;.change_c: ; // VRR is an obsolete functionality, used only with CRT monitors |
907,11 → 896,21 |
; _setcursor 12,0 |
; jmp .d |
.change_c: ; c) preboot_debug = duplicates kernel debug output to the screen |
_ask_question ask_debug,'12',preboot_debug ; range accepted for answer: 1-2 |
_setcursor 16,0 |
mov si, ask_debug |
call print |
mov bx, '12' ; range accepted for answer: 1-2 |
call getkey |
mov [preboot_debug], al |
_setcursor 12,0 |
jmp .d |
.change_d: ; d) preboot_launcher = start the first app (right now it's LAUNCHER) after kernel is loaded? |
_ask_question ask_launcher,'12',preboot_launcher ; range accepted for answer: 1-2 |
_setcursor 16,0 |
mov si, ask_launcher |
call print |
mov bx, '12' ; range accepted for answer: 1-2 |
call getkey |
mov [preboot_launcher], al |
_setcursor 13,0 |
jmp .d |
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