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44 regels
1.1 KiB
44 regels
1.1 KiB
BITS 16
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; Routine for outputting string in 'si' register to screen
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print:
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;mov bh, 0x00
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mov bl, 0x02
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mov ah, 0xE ; Specify 'int 0x10' 'teletype output' function
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; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
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.printchar:
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lodsb ; Load byte at address SI into AL, and increment SI
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cmp al, 0
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je .done ; If the character is zero (NUL), stop writing the string
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int 0x10 ; Otherwise, print the character via 'int 0x10'
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jmp .printchar ; Repeat for the next character
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.done:
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ret
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printCRLF:
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mov ah, 0xE
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mov al, 13
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int 0x10
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mov al, 10
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int 0x10
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ret
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printSpace:
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mov ax, 0xE20
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int 0x10
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ret
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printALChar:
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mov ah, 0xE
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mov bl, 0x02 ;color
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int 0x10
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ret
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; Changing the screen the user i looking at.
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; value in 'al' is the screen we want to switch to.
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; starting from 0x00
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os_change_screen:
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; Here the addresses for the screens stack
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; and base pointer has to be set.
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mov ah, 0x05
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int 0x10
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ret
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