| 51,18 → 51,20 |
|---|
| ; 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 |
| 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 |
| 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. |
| 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 ; 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 |
| 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' |
| @@: |
| ret |
| |
| 79,6 → 81,18 |
|---|
| 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 |
| 775,23 → 789,21 |
|---|
| 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 |
| mov bx, '12' ; range accepted for answer: 1-2 |
| _ask_question bdev,'12',preboot_device ; range accepted for answer: 1-2 |
| else |
| mov bx, '14' ; range accepted for answer: 1-4 |
| _ask_question bdev,'14',preboot_device ; 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: |
| 803,6 → 815,9 |
|---|
| |
| 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 |
| 873,17 → 888,13 |
|---|
| 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 |
| mov si, ask_bd |
| call print |
| mov bx, '12' ; range accepted for answer: 1-2 |
| call getkey |
| mov [preboot_biosdisk], al |
| _ask_question ask_bd,'12',preboot_biosdisk ; range accepted for answer: 1-2 |
| _setcursor 11,0 |
| jmp .d |
| ;.change_c: ; // VRR is an obsolete functionality, used only with CRT monitors |
| 896,21 → 907,11 |
|---|
| ; _setcursor 12,0 |
| ; jmp .d |
| .change_c: ; c) preboot_debug = duplicates kernel debug output to the screen |
| _setcursor 16,0 |
| mov si, ask_debug |
| call print |
| mov bx, '12' ; range accepted for answer: 1-2 |
| call getkey |
| mov [preboot_debug], al |
| _ask_question ask_debug,'12',preboot_debug ; range accepted for answer: 1-2 |
| _setcursor 12,0 |
| jmp .d |
| .change_d: ; d) preboot_launcher = start the first app (right now it's LAUNCHER) after kernel is loaded? |
| _setcursor 16,0 |
| mov si, ask_launcher |
| call print |
| mov bx, '12' ; range accepted for answer: 1-2 |
| call getkey |
| mov [preboot_launcher], al |
| _ask_question ask_launcher,'12',preboot_launcher ; range accepted for answer: 1-2 |
| _setcursor 13,0 |
| jmp .d |
| ;;;;;;;;;;;;;;;;;;;;;;;;;;;; |