V ROM: Difference between revisions

From NeoGeo Development Wiki
Jump to navigation Jump to search
No edit summary
mNo edit summary
Line 1: Line 1:
[[File:v_rom.jpg|thumb|right|4MiB V1 ROM]]
[[File:v_rom.jpg|thumb|right|4MiB V ROM]]
8 bit ROMs containing [[YM2610|PCM]] audio samples in [[cartridges]].
"'''V'''oice" ? 8-bit ROMs containing [[YM2610|PCM]] audio samples in [[cartridges]].


In early [[cartridges]], the ADPCM-A and ADPCM-B samples were in two separate V ROMs. The [[PCM]] chip was later used to merge both types in the same ROM(s).
In early games, the ADPCM-A and ADPCM-B samples were split in separate V ROMs. Later, the {{Chipname|PCM}} chip was made to allow both types of data to be mixed in the same ROM(s).


V A ROMs minimum speed: any will do (>2µs).
V A ROMs minimum speed: any will do (>2µs).

Revision as of 01:33, 3 November 2016

File:V rom.jpg
4MiB V ROM

"Voice" ? 8-bit ROMs containing PCM audio samples in cartridges.

In early games, the ADPCM-A and ADPCM-B samples were split in separate V ROMs. Later, the PCM chip was made to allow both types of data to be mixed in the same ROM(s).

V A ROMs minimum speed: any will do (>2µs).

V B ROMs minimum speed: 350ns (see YM2610 bus timing).