ACML Posted April 25, 2016 Share Posted April 25, 2016 (edited) Another 1200XL troubleshooting problem. In self test, the ROM checks out and it runs through two complete rows and two blocks on row 3 three (i.e. 34K) and restarts the ROM/RAM test as if everything was good. No errors shown. Even 16K games don't load. I just re-modified the ROM from 28 pin back to 24 pin for the OS ROM. I removed R11, R12 and R13 and returned back R6, R7, R8 and R9. I get the Atari banner, so the ROM works. Did I possibly get some solder touching an adjacent pad that is screwing up the addressing or do I have possible bad RAM? Edited April 25, 2016 by ACML Quote Link to comment Share on other sites More sharing options...
ACML Posted April 25, 2016 Author Share Posted April 25, 2016 Solved my own problem. I knew if I didn't look at the solder work I did earlier today, I'd be thinking about it Monday. Sure enough, as I suspected, I had a tiny solder overlap and it was shorting two address pins together. A little solder wick and viola! 1 Quote Link to comment Share on other sites More sharing options...
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