Wednesday, December 28, 2016

#4 is an NEC D8255A

Task is to decap and identify unknown device

Includes:
  • #4: Joshi Volley Ball AA-007

Unknown device, DIP40:


Decapped:


Closer inspection:


Part identified as NEC D8255A, a variation of the well known Intel 8255A "Programmable Peripheral Interface"

3 comments:

  1. Can I donate a CPS2 board to decap the QSound processor again? You just need an A board, right? Please let me know where to send it.

    ReplyDelete
  2. No new chips are being accepted at this time

    ReplyDelete
  3. As far as I know the QSound (DSP16A chip) has already had it's internal rom dumped and included in MAME. The only thing holding it back is a MAME CPU core to run the rom image. So it's not needed.

    ReplyDelete