PCM: Difference between revisions
Jump to navigation
Jump to search
mNo edit summary |
mNo edit summary |
||
| Line 13: | Line 13: | ||
OpenOffice Draw file: [[File:pcm.odg]] | OpenOffice Draw file: [[File:pcm.odg]] | ||
Pin 47 is GND. | |||
Not sure about A19. | Not sure about A19. | ||
*SDPOE, SDROE, SDPMPX, SDRMPX: from the [[YM2610]] | *SDPOE, SDROE, SDPMPX, SDRMPX: from the [[YM2610]] | ||
Revision as of 21:49, 7 March 2012
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
OpenOffice Draw file: File:Pcm.odg
Pin 47 is GND. 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