4164 Williams mod - 8264 chips?

westal_sage

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I have heard that 8264 chips will work for this common ram mod to Williams games. Can someone confirm this?

The actual chips I have say this on them:

MB8264A-15
8551 M1B
 
As long as they are standard 4164 or equivalent you are good to go... 8264 should be equivalent.

When in doubt, go to the datasheets: http://www.datasheetarchive.com

Just make sure to remove the +12v and the -5 before you power up the newer chips or you'll fry 'em instantly.

RJ
 
Thanks RJ! Hey I'm right down the street from ya. Well....Grapevine.
 
Cool :D

If you need those chips checked I have a hand held DRAM tester that will do the 64k and 256k DRAMs.

RJ
 
OK thanks! It's looking like these 8264s should be compatible. I have one of those pre-made adapter harnesses that will do the voltage steering for the mod. So worst case I can just pop the 4116s back in and stay up n running, then step back and address what went wrong with the 8264s.

I'm doing this on my Robotron - if it goes well I'll do it for Defender, too.
 
Well, everything is looking A-OK with the 8264 chips. It took at most half an hour to pull the main pcb out of the Robotron cab, pull the (24) 4116 chips and drop in the new 8264s. The game fired right up and played perfectly. None of the high scores or bookkeeping stats were affected - I guess that makes sense, since I didn't remove the batteries from the board.

Cool so now the ram bank should run much cooler and I won't have to track down and replace a 4116 every few months or so (knock on wood). Defender is next.
 
Make sure you label the board that it has been modified. That way the next owner doesn't go "what is this stupid adapter?" and plug the board straight into a non-modified harness.

ken
 
Yep got it labeled, but eventually I think I will just mod the pcb directly. The harness was good for a test run - first time I've tried getting the 4116s outta there. So far so good, with lots of hours on it now.
 
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