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osborne1: add comment about three low bits of PIA0 PORTB affecting data direction

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This commit is contained in:
Vas Crabb 2015-11-01 04:02:43 +11:00
parent 518a33cc80
commit 7a85ac5adc
1 changed files with 3 additions and 3 deletions
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6
src/mame/machine/osborne1.c
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@ -181,9 +181,9 @@ WRITE8_MEMBER( osborne1_state::ieee_pia_pb_w )
/*
bit description
0
1
2
0 0 = DATAn as output, 1 = DATAn as input
1 0 = NDAC/NRFD as output, 1 = NDAC/NRFD as input; also gates SRQ
2 0 = EOI/DAV as output, 1 = EOI/DAV as input
3 EOI
4 ATN
5 DAV