NEO-I0

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NEO-I0 chip found on a MV2B MVS board.

MVS specific chip that does a bunch of unrelated things.

  • S ROM address latch for SFIX, same as S ROM portion of NEO-273
  • SM1 /CS output when Z80 is reading from ROM and SM1/SFIX is enabled (SM1CS = SDROM OR SYSTEM)
  • /ROMOE output for cartridge PROG board (ROMOE = ROMOEU AND ROMEOU)
  • Video sync output for JAMMA edge
  • Coin counter and coin lockout output

Pinout

File:Neo-i0 pinout.png

OpenOffice Draw file: File:Neo-i0.odg

  • P0~P15: GPU multiplexed bus.

On a MV1F:

  • Q00~Q18 are connected to the SFIX ROM address lines.
  • SM1CS(ORO0) = SYSTEM(ORI0) OR SDROM(ORI1)
  • SYNCOUT = SYNCIN XOR SYNCREV ?
  • Q21, Q22: METER1, METER2
  • Q23, Q24: LOCK1, LOCK2