===========#==#=======#===============================================#=====
----------------------|YM2149/AY-3-8910 Sound Chip |-----
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$FFFF8800.B|R-|PSG_SEL|Read Data |
|-W| |Register Select |
$FFFF8802.B|rW|PSG_DAT|Write Data |
| | | PSG Register 14 - Port A %RICDPBAS |
| | | Reset IDE 0:no,1:reset (slow down)---+||||||| |F
| | | Internal Speaker 0:on,1:off-----------+|||||| |F
| | | Centronics Strobe----------------------+||||| |
| | | Reset DSP 0:no,1:reset------------------+|||| |F
| | | Printer Select In------------------------+||| |
| | | Drive B select 0:on,1:off-----------------+|| |
| | | Drive A select 0:on,1:off------------------+| |
| | | Side select 0:side1,1:side0-----------------+ |
| | | PSG Register 15 - Port B %xxxxxxxx |
| | | Centronics Data Port-----------------++++++++ |