87 lines
1.2 KiB
NASM
87 lines
1.2 KiB
NASM
cpu 8086
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org 0x3000
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;Store a keycode
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;Read a keypress
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mov ah, 0x0
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int 0x16
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;Store the keycode
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mov [scan], ah
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mov [ascii], al
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;Print the prefix
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mov si, prefix
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mov ah, 0x0
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int 0x21
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;Convert the keycode to a hex string
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;Convert the scancode
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mov al, [scan]
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mov di, keycode
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call byte2hex
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;Convert the ascii value
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mov al, [ascii]
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mov di, keycode
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add di, 0x2
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call byte2hex
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;Print the keycode
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mov si, keycode
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mov ah, 0x2
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int 0x21
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;Return
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int 0x20
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;Data
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prefix db "0x", 0x0
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scan db 0x0
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ascii db 0x0
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keycode times 0x5 db 0x0
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;***
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;Convert the value of a byte to a hex string
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byte2hex:
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;Store AX, BX, CX, and SI in the stack
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push ax
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push bx
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push cx
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push si
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;Setup
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;Move the byte to AH
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mov ah, al
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;Set SI to the hex digit key
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mov si, key
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;Set a counter for the two hex digits
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mov cx, 0x2
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;Convert the byte
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;Read a nibble
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loop:
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times 0x4 rol ax, 0x1
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mov bx, ax
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;Convert the nibble to a hex digit
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and bx, 0xf
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mov bl, [si + bx]
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;Store the hex digit
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mov [di], bl
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;Convert the next nibble
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inc di
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dec cx
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jnz loop
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;Load SI, CX, BX, and AX from the stack
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pop si
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pop cx
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pop bx
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pop ax
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;Return
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ret
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;Data
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key db "0123456789abcdef"
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