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Bitfields for OPTi FireLink/FireBlast "HceControl" register

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Bit Description

31 - 9

reserved

8

A20 gate state

7

IRQ12 active (write 1 to clear)

6

IRQ1 active (write 1 to clear)

5

A20 gate sequence:
1 - D1h written to port 64h
0 - other than D1h written to port 64h

4

external IRQ emulation enable

3

IRQ enable

2

character pending emulation enable

1

(read-only) emulation interrupt condition

0

emulation enable

See Also:

#00902