KLund1 Posted August 20, 2016 Share Posted August 20, 2016 I have sick 800XL. I think is was a garauge find I picked up in a lot. After a magor cleaning, I booted it up. I get a blue screen with only a cursor at the top left. No qwerty key respones. It will not goto to basic. I can't start the self test. It will not boot a disk. It dose play some cart games, like Pac-Man, 3D tic-tac-toe, basketball, space invaders but not most others. The keyboard reset key works, and power +start gets a cassette load sound. Joystick and Start, Option keys work for Pac-man, as dose the game play and sounds. I have reseated the 4 large IC's that are socketed, no change. Suggestions for a fix? Quote Link to comment Share on other sites More sharing options...
Gunstar Posted August 20, 2016 Share Posted August 20, 2016 That may be a bad OS, some carts have their own OS like Star Raiders. Quote Link to comment Share on other sites More sharing options...
KLund1 Posted August 21, 2016 Author Share Posted August 21, 2016 How can I fix a bad os in a 800XL? Or at least test that the OS is bad? Quote Link to comment Share on other sites More sharing options...
spookt Posted August 21, 2016 Share Posted August 21, 2016 Easiest way would be to swap the OS chip with one from a working machine and retest. Quote Link to comment Share on other sites More sharing options...
Gunstar Posted August 21, 2016 Share Posted August 21, 2016 Unless his OS chips are soldered in as is the case on my 800XL...then not so easy...unless it's possible to "piggy-back" a good OS chip over a bad like with ram chips, but I've never tried that. luckily my main computer is a 1200XL with all the chips socketed. Quote Link to comment Share on other sites More sharing options...
Fuji-Man Posted August 21, 2016 Share Posted August 21, 2016 Swap or have somebody put a socket in and burn you an OS eprom. Quote Link to comment Share on other sites More sharing options...
KLund1 Posted August 21, 2016 Author Share Posted August 21, 2016 (edited) That's what I though someone would say. These are siolder in. so it will be a good exersise for my modest sioldering skills. But which OS IC to pull out. the c0615988 or c02497a ?? hopefuly not both Edited August 21, 2016 by KLund1 1 Quote Link to comment Share on other sites More sharing options...
KLund1 Posted August 21, 2016 Author Share Posted August 21, 2016 SOLVED: I pulled and socket replaced the OS and BASIC IC's With know good chips Nojoy Just for the heck ot it I started swapping the 4 larger IC's starting with POKEY. Rebooted, ALL GOOD!!! It was a bad POKEY, or at least partly bad one. Like I said above the keyboard worked, but I guess the rest of it's I/O was bad. Anyone have a extra POKEY they might was to part with...?? Quote Link to comment Share on other sites More sharing options...
Brentarian Posted August 21, 2016 Share Posted August 21, 2016 Best and B&C have them but the shipping is high unless you are ordering other items. I recently bought one off Ebay from this seller: http://ebay.com/itm/282113371170?_trkparms=pageci%3A01e1399c-67f3-11e6-86e0-005056b62981%7Cparentrq%3Aaf5527ad1560a62293a1f228fffdcfed%7Ciid%3A3&_mwBanner=1 Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted August 21, 2016 Share Posted August 21, 2016 Or find a 7800 ball blazer or commando cart. sacrilegious, I know. Quote Link to comment Share on other sites More sharing options...
Brentarian Posted August 21, 2016 Share Posted August 21, 2016 Same with a 5200, but I'd only strip it if it was beyond repair. You can also salvage antic and gtia from them as well. Quote Link to comment Share on other sites More sharing options...
KLund1 Posted August 23, 2016 Author Share Posted August 23, 2016 No trouble, I'm about 4 blocks from Best, I can just go over at lunch and get one. No shipping for me, but have to pay the high sales tax 9.25% Quote Link to comment Share on other sites More sharing options...
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