PS/2 mouse driver [need help]
Posted: Thu May 08, 2025 12:31 am
Hello everyone. I am making my own operating system and I would like to implement a simple PS/2 mouse driver in it, but after many attempts I have failed. I came here to ask for help from experienced OS developers. I am developing my OS on NASM. Here is the source code I am working with:
I would like to draw the cursor as some kind of ASCII symbol
Code: Select all
; ==================================================================
; x16-PRos -- The x16-PRos Operating System kernel
; Copyright (C) 2025 PRoX2011
;
; This is loaded from the second disk sector by boot.bin
; ==================================================================
[BITS 16]
[ORG 500h]
start:
cli
call set_video_mode
; Set up frequency (1193180 Hz / 1193 = ~1000 Hz)
mov al, 0xB6
out 0x43, al
mov ax, 1193
out 0x42, al
mov al, ah
out 0x42, al
call print_interface ; Help menu and headler
mov si, start_melody
call play_melody ; Sturtup sound
call shell ; PRos terminal
jmp $
set_video_mode:
; VGA 640*460, 16 colors
mov ax, 0x12
int 0x10
ret
print_string:
mov ah, 0x0E
mov bl, 0x0F
.print_char:
lodsb
cmp al, 0
je .done
int 0x10
jmp .print_char
.done:
ret
print_newline:
mov ah, 0x0E
mov al, 0x0D
int 0x10
mov al, 0x0A
int 0x10
ret
; ------ Wait 1 second using BIOS delay (CX:DX = microseconds) ------
one_sec_dealy:
mov cx, 0x000F
mov dx, 0x4240
mov ah, 0x86
int 0x15
ret
print_interface:
mov si, header
call print_string
call print_newline
mov si, menu
call print_string_green
call print_newline
ret
print_help:
mov si, menu
call print_string_green
call print_newline
ret
shell:
mov si, prompt
call print_string
call read_command
call print_newline
call execute_command
jmp shell
; ===================== Shell =====================
read_command:
mov di, command_buffer
xor cx, cx
.read_loop:
mov ah, 0x00
int 0x16
cmp al, 0x0D
je .done_read
cmp al, 0x08
je .handle_backspace
cmp cx, 255
jge .done_read
stosb
mov ah, 0x0E
mov bl, 0x1F
int 0x10
inc cx
jmp .read_loop
.handle_backspace:
cmp di, command_buffer
je .read_loop
dec di
dec cx
mov ah, 0x0E
mov al, 0x08
int 0x10
mov al, ' '
int 0x10
mov al, 0x08
int 0x10
jmp .read_loop
.done_read:
mov byte [di], 0
ret
execute_command:
mov si, command_buffer
; Checking the command "help"
mov di, help_str
call compare_strings
je do_help
mov si, command_buffer
; Checking the command "info"
mov di, info_str
call compare_strings
je print_OS_info
mov si, command_buffer
; Checking the command "cls"
mov di, cls_str
call compare_strings
je do_cls
mov si, command_buffer
; Checking the command "CPU"
mov di, CPU_str
call compare_strings
je do_CPUinfo
mov si, command_buffer
; Checking the command "disk-i"
mov di, disk_info_str
call compare_strings
je display_disk_info
mov si, command_buffer
; Checking the command "date"
mov di, date_str
call compare_strings
je print_date
mov si, command_buffer
; Checking the command "time"
mov di, time_str
call compare_strings
je print_time
mov si, command_buffer
; Checking the command "shut"
mov di, shut_str
call compare_strings
je do_shutdown
mov si, command_buffer
; Checking the command "reboot"
mov di, reboot_str
call compare_strings
je do_reboot
mov si, command_buffer
; Checking the command "writer"
mov di, writer_str
call compare_strings
je start_writer
mov si, command_buffer
; Checking the command "brainf"
mov di, brainf_str
call compare_strings
je start_brainf
mov si, command_buffer
; Checking the command "barchart"
mov di, barchart_str
call compare_strings
je start_barchart
mov si, command_buffer
; Checking the command "snake"
mov di, snake_str
call compare_strings
je start_snake
mov si, command_buffer
; Checking the command "calc"
mov di, calc_str
call compare_strings
je start_calc
mov si, command_buffer
; Checking the command "disk-tools"
mov di, disk_tools_str
call compare_strings
je start_disk_tools
mov si, command_buffer
; Checking the command "BASIC"
mov di, BASIC_str
call compare_strings
je start_BASIC
mov si, command_buffer
; Checking the command "mine"
mov di, mine_str
call compare_strings
je start_mine
mov si, command_buffer
; Checking the command "memory"
mov di, memory_str
call compare_strings
je start_memory
mov si, command_buffer
; Checking the command "space"
mov di, space_str
call compare_strings
je start_space
mov si, command_buffer
; Checking the command "load"
mov di, load_str
call compare_strings
je load_program
call unknown_command
ret
compare_strings:
xor cx, cx
.next_char:
lodsb
cmp al, [di]
jne .not_equal
cmp al, 0
je .equal
inc di
jmp .next_char
.not_equal:
ret
.equal:
ret
; ===================== Other =====================
do_banner:
call print_interface
call print_newline
ret
do_help:
call print_newline
call print_help
call print_newline
ret
do_cls:
pusha
mov ax, 0x12
int 0x10
popa
ret
unknown_command:
mov si, unknown_msg
call print_string_red
call print_newline
ret
do_shutdown:
mov si, shut_melody
call play_melody ; Shutdown sound
mov ax, 0x5307
mov bx, 0x0001
mov cx, 0x0003
int 0x15
ret
do_reboot:
int 0x19
ret
; ------ Print information about OS ------
print_OS_info:
mov si, info
call print_string_green
call print_newline
ret
;===================== Functions for running programs =====================
; AL - number of disk sectors to read
; CH - track number
; DH - head number
; CL - disk sector number
; BX - download adress
; ------ Writer program (write.asm) ------
start_writer:
pusha
mov ah, 0x02
mov al, 2
mov ch, 0
mov dh, 0
mov cl, 11
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Brainf program (brainf.asm) ------
start_brainf:
pusha
mov ah, 0x02
mov al, 2
mov ch, 0
mov dh, 0
mov cl, 14
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Barchart program (barchart.asm) ------
start_barchart:
pusha
mov ah, 0x02
mov al, 1
mov ch, 0
mov dh, 0
mov cl, 17
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Snake game (snake.asm) ------
start_snake:
pusha
mov ah, 0x02
mov al, 2
mov ch, 0
mov dh, 0
mov cl, 18
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Calculator program (calc.asm) ------
start_calc:
pusha
mov ah, 0x02
mov al, 2
mov ch, 0
mov dh, 0
mov cl, 20
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Disk-tools utility (disk-tools.asm) ------
start_disk_tools:
push bx
mov ah, 0x02
mov al, 4
mov ch, 0
mov dh, 0
mov cl, 22
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
pop bx
ret
; ------ micro BASIC programing language (https://github.com/PRoX2011/micro-BASIC/blob/main/SRC/ILM.ASM) ------
start_BASIC:
mov ax, 0x02
int 0x10
pusha
mov ah, 0x02
mov al, 9
mov ch, 0
mov dh, 0
mov cl, 27
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Minesweeper game (mine.asm) ------
start_mine:
mov ax, 0x02
int 0x10
pusha
mov ah, 0x02
mov al, 1
mov ch, 0
mov dh, 0
mov cl, 36
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Memory viewer program (memory.asm) ------
start_memory:
mov ax, 0x02
int 0x10
pusha
mov ah, 0x02
mov al, 1
mov ch, 0
mov dh, 0
mov cl, 37
mov bx, 900h ; I use specical program offset. It doesn't work any other way. Idk why
int 0x13
jc .disk_error
jmp 900h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ------ Space arcade game (space.asm) ------
start_space:
pusha
mov ah, 0x02
mov al, 3
mov ch, 0
mov dh, 0
mov cl, 38
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
.disk_error:
mov si, disk_error_msg
call print_string_red
call print_newline
popa
ret
; ===================== CPU info functions =====================
print_edx:
mov ah, 0eh
; mov bh, 0 (Use it for very old BIOS)
mov bx, 4
loop4r:
mov al, dl
int 10h
ror edx, 8
dec bx
cmp bx, 0
jne loop4r
ret
print_full_name_part:
cpuid
push edx
push ecx
push ebx
push eax
mov cx, 4
loop4n:
pop edx
call print_edx
dec cx
cmp cx, 0
jne loop4n
ret
; ------ Print CPU cores number ------
print_cores:
mov si, cores
call print_string
mov eax, 1
cpuid
ror ebx, 16
mov al, bl
call print_al
ret
; ------ Print CPU cache line ------
print_cache_line:
mov si, cache_line
call print_string
mov eax, 1
cpuid
ror ebx, 8
mov al, bl
mov bl, 8
mul bl
call print_al
ret
; ------ Print CPU stepping ID ------
print_stepping:
mov si, stepping
call print_string
mov eax, 1
cpuid
and al, 15
call print_al
ret
print_al:
mov ah, 0
mov dl, 10
div dl
add ax, '00'
mov dx, ax
mov ah, 0eh
mov al, dl
cmp dl, '0'
jz skip_fn
mov bl, 0x0F
int 10h
skip_fn:
mov al, dh
mov bl, 0x0F
int 10h
ret
; ------- Print all CPU information ------
do_CPUinfo:
pusha
mov si, cpu_name
call print_string
; Displaying information about the CPU
mov eax, 80000002h
call print_full_name_part
mov eax, 80000003h
call print_full_name_part
mov eax, 80000004h
call print_full_name_part
mov si, mt
call print_string
call print_cores
mov si, mt
call print_string
call print_cache_line
mov si, mt
call print_string
call print_stepping
mov si, mt
call print_string
popa
ret
; ------ CPU ------
cpu_name db ' CPU name: ', 0
cores db ' CPU cores: ', 0
stepping db ' Stepping ID: ', 0
cache_line db ' Cache line: ', 0
; ===================== Date and time functions =====================
; Function for displaying date
; Displays date in DD.MM.YY format
print_date:
mov si, date_msg
call print_string
pusha
; Get the date: ch - century, cl - year, dh - month, dl - day
mov ah, 0x04
int 0x1a
mov ah, 0x0e
; Print day (dl)
mov al, dl
shr al, 4
add al, '0'
mov bl, 0x0B
int 0x10
mov al, dl
and al, 0x0F
add al, '0'
int 0x10
; Print dot
mov al, '.'
mov bl, 0x0B
int 0x10
; Print mounth (dh)
mov al, dh
shr al, 4
add al, '0'
mov bl, 0x0B
int 0x10
mov al, dh
and al, 0x0F
add al, '0'
mov bl, 0x0B
int 0x10
; Print dot
mov al, '.'
mov bl, 0x0B
int 0x10
; Print year (cl)
mov al, cl
shr al, 4
add al, '0'
mov bl, 0x0B
int 0x10
mov al, cl
and al, 0x0F
add al, '0'
mov bl, 0x0B
int 0x10
mov si, mt
call print_string
popa
ret
; Function for displaying time
; Displays date in HH.MM.SS format
print_time:
mov si, time_msg
call print_string
pusha
; Get time: ch - hours, cl - minutes, dh - seconds
mov ah, 0x02
int 0x1a
mov ah, 0x0e
; Print hours (ch)
mov al, ch
shr al, 4
add al, '0'
mov bl, 0x0B
int 0x10
mov al, ch
and al, 0x0F
add al, '0'
mov bl, 0x0B
int 0x10
; Print separator
mov al, ':'
mov bl, 0x0B
int 0x10
; Print minutes (cl)
mov al, cl
shr al, 4
add al, '0'
mov bl, 0x0B
int 0x10
mov al, cl
and al, 0x0F
add al, '0'
mov bl, 0x0B
int 0x10
; Print separator
mov al, ':'
mov bl, 0x0B
int 0x10
; Print seconds (dh)
mov al, dh
shr al, 4
add al, '0'
mov bl, 0x0B
int 0x10
mov al, dh
and al, 0x0F
add al, '0'
mov bl, 0x0B
int 0x10
mov si, mt
call print_string
popa
ret
; ------ Date & time ------
time_msg db 'Current time: ', 0
date_msg db 'Current date: ', 0
; ===================== Load Command functions =====================
load_program:
mov si, load_prompt
call print_string
call read_number
call print_newline
call start_program
ret
; ------ Read number input ------
read_number:
mov di, number_buffer
xor cx, cx
.read_loop:
mov ah, 0x00
int 0x16
cmp al, 0x0D
je .done_read
cmp al, 0x08
je .handle_backspace
cmp cx, 5
jge .read_loop
cmp al, '0'
jb .read_loop
cmp al, '9'
ja .read_loop
stosb
mov ah, 0x0E
mov bl, 0x1F
int 0x10
inc cx
jmp .read_loop
.handle_backspace:
cmp cx, 0
je .read_loop
dec di
dec cx
mov ah, 0x0E
mov al, 0x08
int 0x10
mov al, ' '
int 0x10
mov al, 0x08
int 0x10
jmp .read_loop
.done_read:
mov byte [di], 0
call convert_to_number
ret
; ------ Convert ASCII to number ------
convert_to_number:
mov si, number_buffer
xor ax, ax
xor cx, cx
.convert_loop:
lodsb
cmp al, 0
je .done_convert
sub al, '0'
imul cx, 10
add cx, ax
jmp .convert_loop
.done_convert:
mov [sector_number], cx
ret
convert_ah_to_hex:
push ax
push bx
mov bx, hex_nums
; Convert high nibble
mov al, ah
shr al, 4
xlatb
mov [error_code_hex], al
; Convert low nibble
mov al, ah
and al, 0x0F
xlatb
mov [error_code_hex+1], al
pop bx
pop ax
ret
; ------ Start program from the disk sec ------
start_program:
pusha
mov ah, 0x02
mov al, 1
mov ch, 0
mov dh, 0
mov cl, [sector_number]
mov bx, 800h
int 0x13
jc .disk_error
jmp 800h
ret
.disk_error:
mov si, error_sound
call play_melody
push ax
call convert_ah_to_hex
mov si, disk_error_msg
call print_string_red
mov al, [error_code_hex]
call print_char_red
mov al, [error_code_hex+1]
call print_char_red
call print_newline
pop ax
popa
ret
print_char_red:
mov ah, 0x0E
mov bl, 0x0C
int 0x10
ret
load_prompt db 'Enter sector number: ', 0
disk_error_msg db 'Disk error! Error code: 0x', 0
error_code_hex db '00', 0
hex_nums db "0123456789ABCDEF"
number_buffer db 6 dup(0)
sector_number dw 0
; ===================== Colored prints =====================
; ------ Green ------
print_string_green:
mov ah, 0x0E
mov bl, 0x0A
.print_char:
lodsb
cmp al, 0
je .done
int 0x10
jmp .print_char
.done:
ret
; ------ Cyan ------
print_string_cyan:
mov ah, 0x0E
mov bl, 0x0B
.print_char:
lodsb
cmp al, 0
je .done
int 0x10
jmp .print_char
.done:
ret
; ------ Red ------
print_string_red:
mov ah, 0x0E
mov bl, 0x0C
.print_char:
lodsb
cmp al, 0
je .done
int 0x10
jmp .print_char
.done:
ret
; ------ Print decimal number ------
print_number:
pusha
xor cx, cx
mov bx, 10
xor dx, dx
.next_digit:
xor dx, dx
div bx
push dx
inc cx
test ax, ax
jnz .next_digit
.print_digits:
pop dx
add dl, '0'
mov ah, 0x0E
mov al, dl
int 0x10
loop .print_digits
mov ah, 0x0E
mov al, ' '
int 0x10
popa
ret
; Print AL as 2-digit hex number
print_hex_byte:
push ax
push cx
mov cl, 4
mov ah, al
shr al, cl
call .print_nibble
mov al, ah
and al, 0x0F
call .print_nibble
pop cx
pop ax
ret
.print_nibble:
cmp al, 10
jl .digit
add al, 'A' - 10 - '0'
.digit:
add al, '0'
call print_char
ret
print_char:
pusha
mov ah, 0x0E
mov bh, 0x00
int 0x10
popa
ret
; ===================== Disk information =====================
; ------------------------------------------
; Get Disk Parameters
; Input: DL = drive number (0x80, etc.)
; Output: CF=0 on success, CF=1 on error
; On success:
; - [lba_support] = 1 if LBA supported
; - CHS params filled (if available)
; Modifies: AX, BX, CX, DX
; ------------------------------------------
get_disk_params:
push es
push di
push si
mov ah, 0x41
mov bx, 0x55AA
int 0x13
jc .no_lba
mov byte [lba_support], 1
mov ah, 0x48
mov si, disk_parameters_packet
int 0x13
jnc .lba_success
.no_lba:
mov byte [lba_support], 0
mov ah, 0x08
int 0x13
jc .error
mov [disk_count], dl
mov al, ch
mov ah, cl
shr ah, 6
mov [cylinder], ax
xor ax, ax
mov al, dh
inc ax
mov [heads], ax
mov al, cl
and al, 0x3F
mov [sectors], ax
mul word [heads]
mul word [cylinder]
mov [total_sectors], ax
mov [total_sectors+2], dx
clc
jmp .done
.lba_success:
mov eax, [disk_parameters_packet+4]
mov [cylinder], ax
mov eax, [disk_parameters_packet+8]
mov [heads], ax
mov eax, [disk_parameters_packet+12]
mov [sectors], ax
cmp word [cylinder], 0
jne .done
mov word [cylinder], 1024
mov word [heads], 16
mov word [sectors], 63
.error:
stc
.done:
pop si
pop di
pop es
ret
; ------ Display Disk Information ------
display_disk_info:
mov si, disk_info_msg
call print_string
call get_disk_params
jc .error
mov si, lba_support_msg
call print_string
cmp byte [lba_support], 1
je .lba_yes
mov si, no_msg
call print_string_red
jmp .show_chs
.lba_yes:
mov si, yes_msg
call print_string_green
.show_chs:
mov si, chs_params_msg
call print_string
mov si, cylinders_msg
call print_string
mov ax, [cylinder]
call print_number
mov si, heads_msg
call print_string
mov ax, [heads]
call print_number
mov si, sectors_msg
call print_string
mov ax, [sectors]
call print_number
call print_newline
ret
.error:
mov si, error_sound
call play_melody
mov si, disk_info_error_msg
call print_string_red
call print_newline
ret
disk_info_msg db " Disk Information:", 13, 10, 0
lba_support_msg db " LBA Supported: ", 0
yes_msg db "Yes",13,10,0
no_msg db "No",13,10,0
total_sectors_msg db " Total Sectors: ",0
chs_params_msg db " CHS Parameters:",13,10,0
cylinders_msg db " Cylinders: ",0
heads_msg db 13,10," Heads: ",0
sectors_msg db 13,10," Sectors per track: ", 0
disk_info_error_msg db "Error reading disk parameters!",0
disk_parameters_packet:
dw 0x001A ; Size of packet
dw 0 ; Information flags
dd 0 ; Number of cylinders
dd 0 ; Number of heads
dd 0 ; Sectors per track
dq 0 ; Total sectors (TODO)
dw 0 ; Bytes per sector
lba_support db 0
disk_count db 0
cylinder dw 0
heads dw 0
sectors dw 0
total_sectors dd 0
; ===================== PC speaker functions =====================
; ------ Turn on the speaker ------
on_pc_speaker:
pusha
in al, 0x61
or al, 0x03
out 0x61, al
popa
ret
; ------ Turn off the speaker ------
off_pc_speaker:
pusha
in al, 0x61
and al, 0xFC
out 0x61, al
popa
ret
; ------ Startup sound ------
play_melody:
pusha
; mov si, melody
.next_note:
mov ax, [si]
cmp ax, 0
je .done
mov dx, [si+2]
add si, 4
call set_frequency
call on_pc_speaker
call delay_ms
call off_pc_speaker
jmp .next_note
.done:
popa
ret
set_frequency:
push ax
mov al, 0xB6
out 0x43, al
pop ax
out 0x42, al
mov al, ah
out 0x42, al
ret
delay_ms:
pusha
mov ax, dx
mov cx, 1000
mul cx
mov cx, dx
mov dx, ax
mov ah, 0x86
int 0x15
popa
ret
shut_melody:
dw 761, 250 ; G6
dw 1015, 250 ; D6
dw 1811, 250 ; E5
dw 0, 0 ; Melody end
start_melody:
dw 1811, 250 ; E5
dw 1015, 250 ; D6
dw 761, 250 ; G6
dw 0, 0 ; Melody end
error_sound:
dw 2415, 250 ; B4
dw 2415, 250 ; B4
dw 0, 0 ; Melody end
; ===================== Data section =====================
; ------ Help menu and headler ------
header db '============================= x16 PRos v0.3 ====================================', 0
menu db 0xC9, 47 dup(0xCD), 0xBB, 10, 13 ; ╔═══════════════════════════════════════════════╗
db 0xBA, 'Commands: ', 0xBA, 10, 13 ; ║ ... ║
db 0xBA, ' help - get list of the commands ', 0xBA, 10, 13
db 0xBA, ' info - print information about OS ', 0xBA, 10, 13
db 0xBA, ' cls - clear terminal ', 0xBA, 10, 13
db 0xBA, ' shut - shutdown PC ', 0xBA, 10, 13
db 0xBA, ' reboot - go to bootloader (restart system) ', 0xBA, 10, 13
db 0xBA, ' date - print current date (DD.MM.YY) ', 0xBA, 10, 13
db 0xBA, ' time - print current time (HH.MM.SS) ', 0xBA, 10, 13
db 0xBA, ' CPU - print CPU info ', 0xBA, 10, 13
db 0xBA, ' disk-i - print disk info ', 0xBA, 10, 13
db 0xBA, ' load - load program from disk sector ', 0xBA, 10, 13
db 0xBA, ' writer - text editor ', 0xBA, 10, 13
db 0xBA, ' brainf - brainf IDE ', 0xBA, 10, 13
db 0xBA, ' barchart - charting soft (by Loxsete) ', 0xBA, 10, 13
db 0xBA, ' snake - snake game ', 0xBA, 10, 13
db 0xBA, ' calc - calculator program (by Saeta) ', 0xBA, 10, 13
db 0xBA, ' disk-tools - disk utility (disk 0x80) ', 0xBA, 10, 13
db 0xBA, ' BASIC - start micro-BASIC interpriter ', 0xBA, 10, 13
db 0xBA, ' mine - minesweeper game ', 0xBA, 10, 13
db 0xBA, ' memory - memory viewer program ', 0xBA, 10, 13
db 0xBA, ' space - space arcade game (by Qwez) ', 0xBA, 10, 13
db 0xC0, 47 dup(0xCD), 0xBC, 10, 13 ; ╚═══════════════════════════════════════════════╝
db 0
; ------ About OS ------
info db 10, 13
db 0xC9, 46 dup(0xCD), 0xBB, 10, 13 ; ╔══════════════════════════════════════════════╗
db 0xBA, ' x16 PRos is the simple 16 bit operating ', 0xBA, 10, 13 ; ║ ... ║
db 0xBA, ' system written in NASM for x86 PC`s ', 0xBA, 10, 13
db 0xC3, 46 dup(0xC4), 0xB4, 10, 13 ; ╠══════════════════════════════════════════════╣
db 0xBA, ' Autor: PRoX (https://github.com/PRoX2011) ', 0xBA, 10, 13
db 0xBA, ' Amount of disk sectors: 50 ', 0xBA, 10, 13
db 0xBA, ' Video mode: 0x12 (640x480; 16 colors) ', 0xBA, 10, 13
db 0xBA, ' License: MIT ', 0xBA, 10, 13
db 0xBA, ' OS version: 0.3.5 (Graphic & Sound) ', 0xBA, 10, 13
db 0xC0, 46 dup(0xCD), 0xBC, 10, 13 ; ╚══════════════════════════════════════════════╝
db 0
; ------ Comands -------
help_str db 'help', 0
info_str db 'info', 0
cls_str db 'cls', 0
shut_str db 'shut', 0
reboot_str db 'reboot', 0
CPU_str db 'CPU', 0
disk_info_str db 'disk-i', 0
date_str db 'date', 0
time_str db 'time', 0
load_str db 'load', 0
writer_str db 'writer', 0
brainf_str db 'brainf', 0
barchart_str db 'barchart', 0
snake_str db 'snake', 0
calc_str db 'calc', 0
disk_tools_str db 'disk-tools', 0
BASIC_str db 'BASIC', 0
mine_str db 'mine', 0
memory_str db 'memory', 0
space_str db 'space', 0
; ------ Other ------
unknown_msg db 'Unknown command.', 0
prompt db '[PRos] > ', 0
mt db '', 10, 13, 0
buffer db 512 dup(0)
command_buffer db 128 dup(0)
