Re: WTB Williams Special Chips

Damn fine memory John!

Sean Riddle worked out a small circuit which will allow you to use SC1
instead of SC2.

Here's the link to his pages.

http://www.ionet.net/~sriddle/willy4.html#hard

But Bob Roberts should be able to program the Decoder Prom. He programs all
the other classic Williams (which I think were 4 and 6). You should be able
to find the image (binary) data for him in the MAME ROM files.

Cheers
MacMan

on 21/4/02 4:31 PM, John Robertson at jrr@flippers.com wrote:

> 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
>>>>
>>>> __________________________________________________
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>>>>
>>>
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Received on Sun Apr 21 03:06:15 2002