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midyunit.cpp: Add documentation about the known NARC sound program ROMs and sound data.

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Brian Troha 2021-04-11 15:13:19 -05:00
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src/mame/drivers/midyunit.cpp
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@ -98,6 +98,16 @@ Revision history for NARC:
No Mr. Big kills
Players not able to find blue card in drug lab witnessed
NARC sound program and data ROMs:
The REV1 ROMs have no known build date or revision code.
The REV2 ROMs have a Version 1.1 1/16/89 string in the U5 ROM starting at 0xC04C, which
coincides with the above released date of the 2.00 ROMs for the first production release.
In the source code archive that was released, there are sound ROMs with a Version 1.0 1/12/89
string. It's not known which if any set these should be matched to. Maybe the missing v1.91?
For each sound ROM set, both program ROMs as well as the 4 data ROMs are unique to that build.
*************************************************************************
TROG development based on notes in source code & dumped sets: