| 47,21 → 47,21 |
|---|
| popa |
| ret |
| |
| getkey: |
| getkey: ; Use BIOS INT 16h to read a key from the keyboard |
| ; 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 |
| int 16h |
| cmp al, bl |
| jb getkey |
| cmp al, bh |
| 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 |
| 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 |
| jnz @f |
| 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 |
| 779,9 → 779,9 |
|---|
| mov si, bdev |
| call print |
| if defined extended_primary_loader |
| mov bx, '12' |
| mov bx, '12' ; range accepted for answer: 1-2 |
| else |
| mov bx, '14' |
| mov bx, '14' ; range accepted for answer: 1-4 |
| end if |
| call getkey |
| mov [preboot_device], al |
| 875,12 → 875,12 |
|---|
| _setcursor 16,0 |
| ; mov si, ask_dma // (earlier was: preboot_dma = use DMA access?) |
| ; call print |
| ; mov bx, '13' |
| ; mov bx, '13' ; range accepted for answer: 1-3 |
| ; call getkey |
| ; mov [preboot_dma], al |
| mov si, ask_bd |
| call print |
| mov bx, '12' |
| mov bx, '12' ; range accepted for answer: 1-2 |
| call getkey |
| mov [preboot_biosdisk], al |
| _setcursor 11,0 |
| 889,7 → 889,7 |
|---|
| ; _setcursor 16,0 |
| ; mov si, vrrmprint |
| ; call print |
| ; mov bx, '12' |
| ; mov bx, '12' ; range accepted for answer: 1-2 |
| ; call getkey |
| ; mov [preboot_vrrm], al |
| ; _setcursor 12,0 |
| 898,7 → 898,7 |
|---|
| _setcursor 16,0 |
| mov si, ask_debug |
| call print |
| mov bx, '12' |
| mov bx, '12' ; range accepted for answer: 1-2 |
| call getkey |
| mov [preboot_debug], al |
| _setcursor 12,0 |
| 907,7 → 907,7 |
|---|
| _setcursor 16,0 |
| mov si, ask_launcher |
| call print |
| mov bx, '12' |
| mov bx, '12' ; range accepted for answer: 1-2 |
| call getkey |
| mov [preboot_launcher], al |
| _setcursor 13,0 |