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I have found a 24pin chip that I can not identify and what it is used on. I hope someone is able to help Motorola SCM67211S Thanks for any help

Just wondering if there are schematics for wonderboy

Thanks Andrew You were right about the tl082’s. I replaced the 4 and the words became clear. Now I just have some adjustments to make and hopefully everything will be done. Thanks again for all your great help and support I appreciate it

Dac is at 4.8v

6.8 is at 6.6

+15.0 -15.2

I metered all pins on all chips in that section and compared them to the working boardset and pretty much got the exact reading. I scoped signals back to n/p3 and r3 Roms and got the same signals as well but I just noticed the 5v rail is down to 4.689volts. Don’t know what that can be caused...

I got the 6012’s, 1495’s, 201’s from twisty wrist and the tl082’s from mouser I believe

I socketed the 201’s and the 1495’s and installed new chips but the same picture. I scoped all the signals backwards from x/y test points to 74ls194’s compared them to working boardset and see no difference. I must be missing something or doing something wrong

I also have socketed the dacs and put new ones in still like in pictures

Thanks again definitely some progress

Thanks Andrew I found a broken leg on one of those square black capacitors and that seemed to stabilize the x/y voltages X and y outs ac are between 2 and 4 volts that’s correct right? The game is looking better but the words still aren’t legible but the tempest wording is looking good now. The...

Yes the catbox can do a lot. I just got the catbox so I’m trying to learn everything it can do. I always try to understand how all boards work from start to finish but these vector games still have me stumped how these signals are drawn

Thanks again I am new to oscilloscopes how do I setup the scope for this

The picture shows in test mode I do have a rigol ds1054 I’m pretty new to using a oscilloscope though When you guys refer to the sacs are they the Dac-08 chip or the am6012’s or the lf13201’s? Thanks for everyone’s help

Hi I am working on a tempest board set and I have a screen like one in the picture. The y-out voltage is correct but x-out dc voltage looks correct but ac voltage doesn’t fluctuate just stays high at around 4.2v. So far: 1. Swapped out auxiliary board with good one 2. I have all chips in analog...

Hi I am just wondering if anyone has any suggestions about half of sprites are in the wrong position. It started with no sprites and found 12 bad chips on clock board and 3 bad chips on the video board. Thinking power was hooked up wrong or something. Now all moving objects(sprites) have half in...

Bought the set from Mike’s Arcade talked to Tony and he was super helpful and knowledgeable the set helped me out and it worked with the tkg3-06 4 board set perfectly. Thanks again

Thanks I wasn’t sure if that was the right set but it makes sense now being a 12 rom set. Thanks again