SECTION 6
Conversions and Interfaces
6-102 PEN*KEY
R
6200/6300 Hand-Held Computer Programmer’s Reference Guide
INT 15h, Function AH = 90h: Device Busy
BIOS
Invoked by the BIOS. The default handler returns with AH set to zero and carry
flag clear.
On Entry:
AH = 90h
AL = Device type
00h Fixed disk
01h Disk
02h Keyboard
03h Pointing device
80h Network
FCh Fixed disk reset
FDh Disk driver motor start
FEh Printer
ES:BX = Points to request block if AL = 80hćFFh
On Return:
If successful:
Carry = 0 (Wait NOT performed, driver completes own wait)
AH = 00h
If NOT successful:
Carry = 1 (Wait performed, I/O complete or timeout)
INT 15h, Function AH = 91h: Interrupt Complete
BIOS
On Entry:
AH = 91h
AL = Device type
00h Fixed disk
01h Disk
02h Keyboard
03h Pointing device
80h Network
FCh Fixed disk reset
FDh Disk driver motor start
FEh Printer
ES:BX = Points to request block if AL = 80hćFFh
On Return:
If successful:
Carry = 0 (Wait NOT performed, driver completes own wait)
If NOT successful:
Carry = 1 (Wait performed, I/O complete or timeout)
6. Conversions and
Interfaces