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0090-009F ---- PS/2 POS (Programmable Option Select)
0090 Central arbitration control port
0091 Card selection feedback
0092 r/w PS/2 system control port A (port B is at 0061)
bit 7-6 any bit set to 1 turns activity light on
bit 5 reserved
bit 4 = 1 watchdog timout occurred
bit 3 = 0 RTC/CMOS security lock (on password area) unlocked
= 1 CMOS locked (done by POST)
bit 2 reserved
bit 1 = 1 indicates A20 active
bit 0 = 0 system reset or write
1 pulse alternate reset pin (alternate CPU reset)
0094 w system board enable/setup register
bit 7 = 1 enable functions
= 0 setup functions
bit 5 = 1 enables VGA
= 0 setup VGA
0095 reserved
0096 w adapter enable /setup register
bit 3 = 1 setup adapters
= 0 enable registers
0097 reserved
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