Revision as of 23:30, 25 March 2011

V ROM banking and multiplexing chip, found in AES and MVS cartridges.

NEO-PCM2 can also be found in late cartridges and with NEO-YSA2 on ROM-only arcade boards.

On some cartridge boards, V A20~V A22 can be used to select which of the 4 possible V ROMs to use (decoded by a LS139).

Pinout

Not sure about A19.

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 [[File:crt_pcm.jpg|right|thumb|NEO-PCM chip found in a MVS cartridge. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]]
-[[V ROM|PCM ROM]] banking chip in QFP96 package, found in AES and MVS [[cartridges]].
+[[V ROM]] banking and multiplexing chip, found in AES and MVS [[cartridges]].
-[[NEO-PCM2]] (bigger), can also be found in late cartridges and with [[NEO-YSA|NEO-YSA2]] on [[ROM-Only boards|ROM-only]] arcade boards.
+[[NEO-PCM2]] can also be found in late cartridges and with [[NEO-YSA2]] on [[ROM-Only boards|ROM-only]] arcade boards.
+On some [[cartridge boards]], V A20~V A22 can be used to select which of the 4 possible V ROMs to use (decoded by a LS139).
+=Pinout=
+[[File:Pcm_pinout.png]]
+Not sure about A19.
+*SDPOE, SDROE, SDPMPX, SDRMPX: from the [[YM2610]]
+*SDRAD0~SDRAD7: ADPCM-A data bus
+*SDPAD0~SDPAD7: ADPCM-B data bus
+*SDRA8,SDRA9,SDRA20~SDRA23: ADPCM-A address bus
+*SDPA8~SDPA11: ADPCM-B address bus
+*V D0~V D7: V ROM(s) data bus
+*V A0~V A21: V ROM(s) address bus
 [[Category:Chips]]