NEO-PVC: Difference between revisions
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[[File:brd_pvc.jpg|thumb|NEO-PVC chip. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]] | [[File:brd_pvc.jpg|thumb|NEO-PVC chip. Picture courtesy of [[http://www.mvs-scans.com MVS-Scans]].]] | ||
QFP144 chip connected to the [[P ROM]]s in [[ROM-Only boards|ROM-only]] arcade boards and late cartridges [[SVC Chaos]], [[Metal Slug 5]] and [[ | QFP144 chip connected to the [[P ROM]]s in [[ROM-Only boards|ROM-only]] arcade boards and late cartridges [[SNK vs. Capcom - SVC Chaos]], [[Metal Slug 5]] and [[The King of Fighters 2003]]. Used for bankswitching and security. | ||
Has 8KiB of integrated RAM organized as 4096 16bit words. | Has 8KiB of integrated RAM organized as 4096 16bit words. | ||
Revision as of 15:30, 3 February 2013
QFP144 chip connected to the P ROMs in ROM-only arcade boards and late cartridges SNK vs. Capcom - SVC Chaos, Metal Slug 5 and The King of Fighters 2003. Used for bankswitching and security.
Has 8KiB of integrated RAM organized as 4096 16bit words.
From [MAME's source]:
Accesses are made in the $2FE000~$2FFFFF range:
COMBINE_DATA(&state->m_pvc_cartridge_ram[offset] ); if (offset == 0xff0) pvc_prot1(space->machine()); else if(offset >= 0xff4 && offset <= 0xff5) pvc_prot2(space->machine()); else if(offset >= 0xff8) pvc_write_bankswitch(space);