SurePOS 500 4846-XX5 Technical Reference
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6Ch 4 Timer Counter 1Ah
70h 1 Timer Overflow 1Ah
71h 1 Break key state 16h
72h 2 Reset Flag
74h 1 HDD operation status 13h
75h 1
Number of HDDs
attached
13h
76h 2 Reserved 13h
78h 1 LPT1 time-out 14h
79h 1 LPT2 time-out 14h
7Ah 1 LPT3 time-out 14h
7Bh 1 Reserved
7Ch 1 COM1 time-out
7Dh 1 COM2 time-out
7Eh 1 COM3 time-out
7Fh 1 COM4 time-out
80h 2 Keyboard buffer start ptr 16h
82h 2 Keyboard buffer end ptr 16h
84h 7 Video info 10h
89h 2 Reserved
8Bh 1 Floppy media control 13h
8Ch 1 HDD Controller status 13h
8Dh 1
HDD Controller error
status
13h
8Eh 1 HDD Interrupt control 13h
8Fh 1 Reserved
90h 1 Floppy 0 media status 13h
91h 1 Floppy 1 media status 13h
92h 1 Floppy 2 media status 13h
93h 1 Floppy 3 media status 13h
94h 1 Drive 0 current cylinder 13h
95h 1 Drive 1 current cylinder 13h
96h 1
Keyboard mode state &
flags
16h
97h 1 Keyboard LED flags 16h
98h 2 User Wait flag offset 15h
9Ah 2 User wait flag segment 15h
9Ch 2
Low word of user wait
count
15h
9Eh 2
High word of user wait
count
15h
A0h 1 Wait active flag 15h
A1h 7 Reserved
A8h 4 Video info 10h
ACh 54h Reserved
100h 1 Print Screen status 05h
