CThiesUGP Posted January 29, 2013 Share Posted January 29, 2013 HI I recently upgraded a 400 to 48k using the 48k expansion kit. After installation I did the memory check with the Basic cartridge which checked out fine 37902, Cartridges work fine, but discs won't load completely and they work fine in my 800xl so it's not the discs or the drive. I was wondering if anyone had any ideas. Quote Link to comment Share on other sites More sharing options...
Mclaneinc Posted January 29, 2013 Share Posted January 29, 2013 (edited) Define what you mean by they don't work, do they load and then crash, does the drive start etc etc You will get better help with more info.. I presume you took the BASIC cart out to boot them as a test? Could be duff ram that the self test isn't picking up...I also presume you have checked the uprade... Edited January 29, 2013 by Mclaneinc Quote Link to comment Share on other sites More sharing options...
mimo Posted January 29, 2013 Share Posted January 29, 2013 Are they games that require an xl? Sorry if that's a silly question Quote Link to comment Share on other sites More sharing options...
CThiesUGP Posted January 29, 2013 Author Share Posted January 29, 2013 It would crash after the title screen(s) would appear.For instance, my Zaxxon disc, you would see both the title screen and splash screen then the game would crash, distorted graphics. Carts work fine Quote Link to comment Share on other sites More sharing options...
Android8675 Posted January 29, 2013 Share Posted January 29, 2013 So the disc drive is working, it reads in data, but when your game gets to a certain point it crashes. Did the game work on the 400 when it was only 16k? Carts use less ram, guessing this game is hitting bad ram. I'm not an authority. I'd say find a ram test and run it on the 400. Maybe some/all of the ram on the new board is bad. Quote Link to comment Share on other sites More sharing options...
Mclaneinc Posted January 29, 2013 Share Posted January 29, 2013 I tried several emulated scenario's and can't find a way to repeat your issue, Altirra is pretty damn good at emulating the hardware and I've tried OSA, OSB, 48K, with and without BASIC in and none of them repeat what you said so my guess is a dodgy ram? Was this an upgrade card you built yourself? Quote Link to comment Share on other sites More sharing options...
CThiesUGP Posted January 30, 2013 Author Share Posted January 30, 2013 This is an Atari Factory upgrade kit.Already assembled. I soldered the jumpers in the right pins of the motherboard , the basic cart tests correctly 37902, I am wondering if there is something I overlooked Quote Link to comment Share on other sites More sharing options...
CThiesUGP Posted January 31, 2013 Author Share Posted January 31, 2013 (edited) Update: I took out the 4864 RAM ICs from the ram board and replaced them with some 4164's that I had for a future project and it works.So it was the ram Edited January 31, 2013 by CThiesUGP 1 Quote Link to comment Share on other sites More sharing options...
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