18 lines
400 B
NASM
18 lines
400 B
NASM
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_start:
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push ax
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xor bp, bp ;clear out bp
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mov ah, 1 ;Function 1, check key status.
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int 16h ;Is a key ready?
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jz NO_KEY ;If zf cleared, then no.
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xor ah, ah ;Otherwise, a key is waiting.
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int 16h ;ah -> scancode
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xor al, al
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xchg al, ah ;ax -> scancode
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mov bp, ax ;bp -> scancode, accessible globally
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NO_KEY:
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pop ax
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ret
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