Hi Bernd,
When the PC starts, BDA 40:96 is initially zero. As soon as the users
enters some specific keys (like the arrow keys), the value at 40:96
changes to 0x10. So the BIOS seems to do some keyboard auto detection.
In Turbo Pascal's Turbo Vision, extended keyboards are detected once,
upon program startup, like this:
mov ax, 11ffh
int 16h
xor bl, bl
cmp ax, 11ffh
je @@1
mov bl, 10h
@@1:mov ReadKeyFunc, bl
and then keyboard functions are called like this:
mov ah, ReadKeyFunc
(inc ah)
int 16h
Wouldn't the BIOS detect the extended keyboard when you call INT 16H,
AH=11H? (Probably not but I though I'd ask. :-) ) Bye,
Joe
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