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"
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3 comments:

  1. UnknownDecember 29, 2016 at 8:26 PM

    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. CAPS0ffJanuary 1, 2017 at 11:45 AM

    No new chips are being accepted at this time

    ReplyDelete
  3. BrianTJanuary 27, 2017 at 11:58 AM

    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

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