Warlords - ROM Error

I suspect that I can determine if it's the pokey by cleaning the pots. If I get ZERO improvement... it's the pokey. Right?


you can do a simplified version of cleaning them just by rotating them back & forth to clean up the carbon build up (or what ever that stuff is) off

similar to an old radio or guitar amp with static in the pots

maybe
 
you can do a simplified version of cleaning them just by rotating them back & forth to clean up the carbon build up (or what ever that stuff is) off

similar to an old radio or guitar amp with static in the pots

maybe

I have some DeOxit I can spray in as well..
 
I 'think' I confirmed it's the POKEY. If I move the left pot REAL slow I get a 50/50 response...or so... but if I stop moving at different point, the shield will continue to move on screen.

That doesn't sound like a pot issue.
 
I just thought of what I think would be a sure-fire way to determine if its the pots or the Pokeys... swap controls. If the problem follows it's the pokeys... if the problem stays 20% control on left and 80% on the right it's the pots...

Right?
 
pokey.jpg
 
OK... so I finally get my 2101 RAM from arcadechips. I try piggybacking one RAM and run through the 8 2101 IC's on the board. No affect what so ever on 7 of 8. One of them causes the image to improve slightly (the top of the blue castle is now coming up right whereas it wasn't before)... but there are still substantial issues with the graphics for Blue and Red...

What are the chances that replacing that one RAM will fix the remaining issues?

If the chances are slim, what else should I look at?

FWIW, I also piggy backed a few random locations while the one IC that caused an affect remained piggybacked and nothing changed... the image remained the same as it did with the one RAM piggybacked.
 
BEFORE piggybacking:

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AFTER piggybacking:

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...and...

SUCCESS!!

It was the single 2101 RAM that I diagnosed by piggybacking. Unfortunately while I had sockets with the proper number of pins, the ones I had were either too narrow or too wide so I couldn't drop a socket in...had to solder directly to the PCB... but I digress.

I'm freakin' STOKED as all heck! Thank you to those who threw out suggestions on how to track down the issue. The fact I was able to do this myself (being the all-thumbs hack that I am) makes it all the sweeter.

Yah man.... totally freakin' stoked...

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