Re: WTB Williams Special Chips

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I believe that Sinistar used Special Chip #2, and there is some discussion
on the minor differences between #1 and #2 on the web pages on one of the
multi-Williams projects pages (not Clay's kit). You need to dig into the
Sinistar section to find it, but there is a schematic (AIR) on the small
changes needed to get the #1 to do the job of a #2. But it's been a while
for this too for me (a year or two) and the docs are buried in a folder at
my shop where I won't be for the next two days...

John :-#)#

At 08:47 PM 20/04/2002 -0700, Teaganm wrote:
>Hey Paul,
>I checked with Bob, but he came up empty. The Classic Williams special
>chip is a SC1 and carries a different part number. It does have the same
>pinout though. I wonder if it's the same chip, maybe running at a higher
>speed. Does anyone know if these are truly special, or just specially
>numbered off the shelf chips?
>
>Steve
>
>--- Paul Sommers <mac_man@iprimus.com.au> wrote:
> > Steve
> >
> > I believe Bob Roberts can burn the Decoder Prom (he does the Defenders
> > and
> > stuff) you probably will just have to send him the binary file if it is
> > different to the other Williams PCB's.
> >
> > I *believe* the SC2 chip is also the same as from the classic Williams
> > sets.
> > But the only place to get one of these is to rob another board.
> >
> > Download the Joust or Robotron manual and check the part numbers for
> > these
> > chips against the Joust equivs.
> >
> > Cheers
> > MacMan
> >
> >
> >
> >
> > on 21/4/02 5:10 AM, Teaganm at teaganm@yahoo.com wrote:
> >
> > > I've been working on bringing a Williams Turkey Shoot back to life.
> > With
> > > some help, it's been determined that I have 3 bad custom chips.
> > >
> > > From the CPU PCB:
> > > IC29 "Special Chip 2" #A-5410-10083 (on the prints as "Custom V.Proc
> > #2)
> > > IC30 same as IC29
> > >
> > > From the Video PCB:
> > > IC60 "Decoder-ROM 5A (Horizontal)" #A-5283-10292 6349 ROM, 512x8
> > >
> > > Does anyone have these for sale, or know who would? The 6349 decoder
> > > looks like an AMD Prom number. Thanks.
> > >
> > > Steve
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Yahoo! Games - play chess, backgammon, pool and more
> > > http://games.yahoo.com/
> > >
> >
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Received on Sat Apr 20 23:36:34 2002