NEO-PVC



QFP144 chip connected to the P ROMs in ROM-only arcade boards and late cartridges like SVC Chaos or Samurai Shodown 5. 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);