A poorly written OS for the x86 arch. (WIP)
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
|
%include "equ/BIOS.asm"
|
|
|
|
|
%include "equ/ASCII.asm"
|
|
|
|
|
|
|
|
|
|
mov ah, BIOS_MODE_TELETYPE ; enter teletype mode (BIOS)
|
|
|
|
|
|
|
|
|
|
; Print "eOS"
|
|
|
|
|
mov al, "e"
|
|
|
|
|
int BIOS_INT
|
|
|
|
|
|
|
|
|
|
mov al, "O"
|
|
|
|
|
int BIOS_INT
|
|
|
|
|
|
|
|
|
|
mov al, "S"
|
|
|
|
|
int BIOS_INT
|
|
|
|
|
|
|
|
|
|
mov al, ASCII_LINEBREAK ; linebreak
|
|
|
|
|
int BIOS_INT
|
|
|
|
|
|
|
|
|
|
; ALPHABET PRINT
|
|
|
|
|
mov al, 64 ; one less than A since we are printing in a loop and it increments before sys interupt
|
|
|
|
|
loop:
|
|
|
|
|
; Print the alphabetic char
|
|
|
|
|
inc al ; move to next char
|
|
|
|
|
int BIOS_INT ; bios interupt to print it
|
|
|
|
|
|
|
|
|
|
;push al ; push al onto stack
|
|
|
|
|
|
|
|
|
|
; Print a linebreak
|
|
|
|
|
;mov al, ASCII_LINEBREAK
|
|
|
|
|
;int BIOS_INT
|
|
|
|
|
|
|
|
|
|
; Prepair for next iteration
|
|
|
|
|
;pop al ; return to char
|
|
|
|
|
|
|
|
|
|
cmp al, 90 ; 26 letters in english alphabet (64 + 26)
|
|
|
|
|
jl loop ; if al < 64+26: jmp loop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
jmp $
|
|
|
|
|
|
|
|
|
|
times 510-($-$$) db 0
|
|
|
|
|
db 0x55, 0xaa
|
