PCM



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.
 * 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