V ROM
The V(oice ?) ROMs contain the ADPCM audio samples in cartridges.
In early games, the ADPCM-A and ADPCM-B data was stored in separate V ROMs. Later, the PCM demultiplexer chip was made to allow both types of data to be mixed in the same ROM(s).
The TC5332204 mask ROMs have a similar pinout to the 27C322 EPROMs. The only difference is that they're set to byte mode only: the /BYTE pin is used as A20, and half of the data output pins are unused.
Speed
- V A ROMs minimum speed: any will do (>2µs).
- V B ROMs minimum speed: 250ns (see YM2610 bus timing).