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Bitfields for Intel 82378ZB/82379 Utility Bus Chip Select B Register

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Bit Description

7

configuration RAM decode enable
1 = permit write accesses to I/O port 0C00h and r/w to ports 08xxh

6

enable PORT 0092h

5 - 4

parallel port enable
00 = LPT1 (ports 03BCh-03BFh)
01 = LPT2 (ports 0378h-037Fh)
10 = LPT3 (ports 0278h-027Fh)
11 = disabled

3 - 2

serial port B enable
00 = COM1 (03F8h-03FFh)
01 = COM2 (02F8h-02FFh)
10 = reserved
11 = port B disabled

1 - 0

serial port A enable
00 = COM1 (03F8h-03FFh)
01 = COM2 (02F8h-02FFh)
10 = reserved
11 = port A disabled

Note:

If both serial ports are set to the same address, port B is disabled.

See Also:

#01064,#01072