The NEW Build Your Own Arcade Controls
Main => Main Forum => Topic started by: GMZombie on November 05, 2020, 03:50:44 pm
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This board has been an issue for a while. Ive been replacing chips due to them being rusty. Ill supply pics. Anyways im having an issue with the sprites not being there just blocks moving. See pics. I have replaced so many chips im st a loss pf what to do next. Changed sockets reflashed 2732 chips the right way following someone elses advice and everything. This board was a dead board and im almost done with it. Everything but this ia fixed. I have checked and roms work in a dk3 boardset with dkjr cpu board perfectly. Please help me. I have a logic probe and a logic analyzer to use. Gotta fix pics too big.
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ram issue? hard to say really. typically if there are sprite issues it's rom or ram...and you've verified the roms are good in another board.
ram or maybe ram/rom addressing issue. like an 74LS08, 74LS86 or a 74LS163 chip gone bad or something.
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The weird thing is ive replaced all 74ls163 74ls08 and all but 2 ls86 chips and the 2 i didnt are by the 3n and 3p chips. My tester says they are good. Ive replaced all the chips besides the 2 ecl ram on the 8 7 and 6 rows except for a random ls109 chip and a few ls157 chips. I had alot of rusty chips. Tried swapping the 28 pin mb43419 chip and that didnt change anything. Here are some pics.
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I would have to agree with L/Shawn on most likely a ROM/RAM issue, That probe probibally won't be of much help since you are getting a signal and not dealing with corruption, I would be curious about your logic analyzer on that point...I am working on a Fluke 9010a platform that in conjunction with an analyzer would give more flexibility and speed although a horribly expensive project...Eldorado games does nice work in my experience, although they may not touch it now that its been worked on, but might be worth a call.