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Copyright 1991 David Jurgens |
INT 15,4F - Keyboard Intercept (BIOS date specific)
AH = 4F
AL = scan code
CF = set to 1 (via STC instruction)
on return
AH = 80h, CF set (PC, PCjr)
= 86h, CF set (XT BIOS 11/8/82, AT BIOS 1/10/84)
AL = CF set, new scan code
= CF clear, original scancode
- available with XT BIOS after 11/8/82, AT BIOS after 1/10/84
- called by INT 9, makes allowance for keyboard translation
- normally returns the scan code in AL, with CF set
- if function returns with CF clear, INT 9 ignores keystroke
- do not rely on this function being called for each INT 9 since
any user INT 9 handler can exit prematurely and circumvent
this function
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| Esc or Alt-X to exit |
int 15,4f |
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