Aaeon PCM-4330, Инструкция по эксплуатации

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Port B
Port B (I/O address 61h) supports the following settings. Bits 0 to 3 are read/write,
bits 4 to 7 are read-only
5.5
Port 61h Data Port Description
KEYB PRNMI INOMI SP SF IOCHK PR SPON SPCOU
r r r r r/w r/w r/w r/w
D7 D6 D5 D4 D3 D2 D1 D0
Bit Name Function
7 PRNMI parity error occurred
0
= no NMI from parity error
1 = parity active, NMI requested
6 IONMI I/O error occurrend
0
= no NMI from IOCHK
1 = IOCHK active, NMI requested
5 SP Loudspesker counter signal
4 RF Refresh detection,changing with the refresh cycle (15
µ
s)
3 IOCHK I/O channel check
0
= enabled
1 = disabled and erased
2 PR Parity checking on systom board
0
= enabled
1 = disabled and erased
1 SPON Direct speaker control
0
= speaker off
1 = speaker on
0 SPCOU Loudspeaker counter gate
0
= counter disabled
1 = counter disabled