A poorly written OS for the x86 arch. (WIP)
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%include "equ/BIOS.asm"
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%include "equ/ASCII.asm"
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mov ah, BIOS_MODE_TELETYPE ; enter teletype mode (BIOS)
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mov al, ASCII_LINEBREAK ; linebreak
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int BIOS_INT
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; Print "eOS"
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mov al, "e"
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int BIOS_INT
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mov al, "O"
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int BIOS_INT
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mov al, "S"
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int BIOS_INT
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mov al, ASCII_CARRIAGE_RETURN
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int BIOS_INT
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mov al, ASCII_LINEBREAK ; linebreak
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int BIOS_INT
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; ALPHABET PRINT
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;; mov al, 64 ; one less than A since we are printing in a loop and it increments before sys interupt
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;; loop:
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;; ; Print the alphabetic char
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;; inc al ; move to next char
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;; int BIOS_INT ; bios interupt to print it
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;; push ax ; push ax onto stack
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;; ; newline
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;; mov al, ASCII_CARRIAGE_RETURN
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;; int BIOS_INT
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;; mov al, ASCII_LINEBREAK
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;; int BIOS_INT
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;; ; Prepair for next iteration
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;; pop ax ; restore
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;; cmp al, 90 ; 26 letters in english alphabet (64 + 26)
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;; jl loop ; if al < 64+26: jmp loop
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jmp $
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times 510-($-$$) db 0
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db 0x55, 0xaa
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