MAME
0c0affd00e
Updated polepos and bosco drivers to use the new 52xx sound
emulation, wiring up the output through the discrete mixer that
Derrick had already plumbed but left disabled.
This required several MB88xx changes/fixes:
- internal timer support now works; prescaler is guessed based
on Pole Position sample playback frequency
- external counter support works
- a basic mechanism for reading serial input has been added; it
is not sufficient for a full implementation, but good enough
to sample the SI pin at startup
- fixed TSTS/TSTV to clear their respective flags
- fixed CI and CYI to compute imm-reg instead of reg-imm
- added masking of the PA register upon RTI/RTS to prevent bogus
PC values
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