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98H Select soft/default font
99H Get unit serial number
9AH Get customer id
9BH Resynchronise timer tick with RTC
9CH Ignored *
9DH Select backlight (option) timeout mode
9EH Reserved
9FH Set 11x8 text font
A0H Set 16x16 text font
A1H Reserved
A2H Select printer port type
A3H Select INT 15H mode (see below)
A4H (duplicate of 80H)
A5H (duplicate of 81H)
A6H (duplicate of 82H)
A7H (duplicate of 83H)
A8H (duplicate of 84H)
A9H (duplicate of 85H)
AAH (duplicate of 86H)
ABH (duplicate of 87H)
ACH (duplicate of 89H)
ADH (duplicate of 90H)
AEH Get/set diskette drive port
AFH Enable/disable temperature override
Note:
The following INT 15H functions are implemented by some AT
BIOSes but are not supported by the MP2500 BIOS: 4FH
(keyboard intercept), 80H (device open), 81H (device close), 82H
(program termination), 83H (set event wait interval), 84H (joystick),
85H (SysReq key), 86H (wait), 87H (move block), 88H (read
extended memory size), 89H (protected mode), 90H (device busy),
91H (interrupt complete), C0H (system configuration address), C1H
(extended BIOS data area address), C2H (pointing device).
Entry
AH selects the function required, while other registers are used for
parameters.
Chapter 26: INT 15H, BIOS Extension Functions [+]
235
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Troubleshooting
