exxos's Atari, Amiga & retro forum

As my first dabble into arcade board work I decided to repro a chip that seems to be pretty easy to kill and impossible to replace. The TC0040IOC in my Chase HQ.... Prototype board design is done, manufactured and installed in my 3rd Chase HQ Board.

Its really simple. A XC95144-T100 chip very tightly packaged into that SDIP64 space.

I have finished the Watchdog timer code for the CPLD. I just need to get the 68K bus timings right. A the moment i get "DIPSW A INITIAL ERROR!" which I presume means its reading garbage from the chip. But there we go i will keep everyone updated with progress


Its designed to be assembled as cheap as possible. The CPLD came preassembled for example.

I love this kind of thing, a noble quest.
Following :)

Cool project, will be watching with interest

terriblefire wrote: 18 Sep 2021 20:03 Its really simple. A XC95144-T100 chip very tightly packaged into that SDIP64 space.

That is really tight. Nice work :thumbup:

May I ask what this chip do exactly?

Trying to work out and reproduce old chips can be fun but also frustrating work.

Once you've finished this I have a nice LSI custom chip I need looking at... the "DECODE1" chip in my Sun 3/80 workstation. It's only a 40 pin PLCC. :lol: ;)

Anyway, good luck with the investigation.

stephen_usher wrote: 18 Sep 2021 22:03 Trying to work out and reproduce old chips can be fun but also frustrating work.

Once you've finished this I have a nice LSI custom chip I need looking at... the "DECODE1" chip in my Sun 3/80 workstation. It's only a 40 pin PLCC. :lol: ;)

Anyway, good luck with the investigation.

Really the only way anything like this gets done is out of necessity.