kirby76 Posted May 7, 2018 Share Posted May 7, 2018 I picked up this Atari 800XL from the market place and It's not booting into Basic, just straight into memory test showing the last row of 8 blocks red. I read that this row was reserved for Basic. Do you think replacing the Basic chip will fix this issue? Also can someone please tell me if the 2 wires in the second photo is a common thing on the 800XL. Maybe It's there because of bad traces? Regular cart games boot but the Atarimax MYIDE ][ does not. All chips are socketed. I tested the DVI Sophia board inside the GTIA chip slot and it was working really well with a sharp picture on a CRT. I would like to also install more memory but first I need to fix these red block errors. Any feedback would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted May 7, 2018 Share Posted May 7, 2018 (edited) It's the ram. Looks like the ram is socketed, so it will be a snap. Best Electronics. EASY. Just take care in putting the new ones in. Edited May 7, 2018 by Paul Westphal 1 Quote Link to comment Share on other sites More sharing options...
kirby76 Posted May 7, 2018 Author Share Posted May 7, 2018 I just got of the phone with them. He told me to swap the first row of the 4 ram chips with the other row and see if the error is still there. I tried that with no luck. So we put in an order for a set of 41256k ram chips. I hope this fixes the issue. Thank you Quote Link to comment Share on other sites More sharing options...
Tillek Posted May 7, 2018 Share Posted May 7, 2018 (edited) To be quite honest, I'm as much concerned with the video display.... Is that top pic really what it looks like? I mean, you said you had a sharp picture under other conditions, but what I'm seeing makes me wonder what else may be wrong? Edited May 7, 2018 by Tillek Quote Link to comment Share on other sites More sharing options...
SoundGammon Posted May 7, 2018 Share Posted May 7, 2018 Can you plug in the keyboard and hold down the option button and do a full memory test? The last 8 blocks not showing up where Basic "sits" in memory. Quote Link to comment Share on other sites More sharing options...
kirby76 Posted May 8, 2018 Author Share Posted May 8, 2018 (edited) To be quite honest, I'm as much concerned with the video display.... Is that top pic really what it looks like? I mean, you said you had a sharp picture under other conditions, but what I'm seeing makes me wonder what else may be wrong? The fuzzy picture was from RF. It got worst when I removed the heat shield. Edited May 8, 2018 by kirby76 Quote Link to comment Share on other sites More sharing options...
kirby76 Posted May 8, 2018 Author Share Posted May 8, 2018 Can you plug in the keyboard and hold down the option button and do a full memory test? The last 8 blocks not showing up where Basic "sits" in memory. Thanks for responding. This is what i got from the full memory test. Last 2 rows all red. Quote Link to comment Share on other sites More sharing options...
1050 Posted May 8, 2018 Share Posted May 8, 2018 Yes, those two wires are common on a lot of them. How about swapping around U26 and U27 for a test to see if the pattern changes in the self test? Might need to replace these if we can get it to change by doing this. At this point it could still be CPU, MMU and a host of others too, but hey what fun! There must be a bug in the self test code as usually three rows is all I've seen. And this could bad ROM itself or the bug acting only with the particular defect. At any rate BASIC occupies the last half of the last row of three. So your first screenshot if it were all green squares is what we want to see if it was booted with BASIC ON. Last screenshot is not possible, but there it is anyway. I'm leaning towards a failing ROM chip U5 at the moment. 1 Quote Link to comment Share on other sites More sharing options...
kirby76 Posted May 8, 2018 Author Share Posted May 8, 2018 How about swapping around U26 and U27 for a test to see if the pattern changes in the self test? Might need to replace these if we can get it to change by doing this. At this point it could still be CPU, MMU and a host of others too, but hey what fun! I hear ya. I really can't wait to try the new chips to get this up and running. I just tried what you recommended by swapping the U26 / U27. Both tests are giving me the same results as previous Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted May 8, 2018 Share Posted May 8, 2018 (edited) https://www.ebay.com/itm/6-Atari-Video-A-V-TV-Cable-Composite-Video-Audio-800-800XL-65XE-130XE/232541246443?hash=item362489d3eb:g:Ey0AAOxytdlQ9xAv Here is your video cable. FYI - when you put in the ram chips ( not sure why he sold you 256k rams ), put one side kinda in there and slightly bend the other side to go in with your fingers, then pop it in. Notch on chip to the left, all chips same direction. Make sure all feet are in. New ram chips go in hard. Eightbitfix.com Edited May 8, 2018 by Paul Westphal 1 Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted May 8, 2018 Share Posted May 8, 2018 256k RAM chips will work fine but it will only use 64k you can always do a RAM upgrade mod at a later date! 1 Quote Link to comment Share on other sites More sharing options...
kirby76 Posted May 8, 2018 Author Share Posted May 8, 2018 FYI - when you put in the ram chips ( not sure why he sold you 256k rams ), put one side kinda in there and slightly bend the other side to go in with your fingers, then pop it in. Notch on chip to the left, all chips same direction. Make sure all feet are in. New ram chips go in hard. Eightbitfix.com Thanks for the tip. Shoot, the chips that are already in there are tough to take out\put in so I can only imagine how tough the new ones will be. I ordered a few other things for this 800xl. I definitely ordered the Composite cable and some other chips like the Antic one just to be safe. I wanna hook this bad boy up to my Commodore monitors so bad. I've been sitting on a barebones 256k Wizztronic revF board for awhile. That's why we went with the 41256k ram chips. I hope everything gets shipped out today. Quote Link to comment Share on other sites More sharing options...
SS Posted May 8, 2018 Share Posted May 8, 2018 https://www.ebay.com/itm/6-Atari-Video-A-V-TV-Cable-Composite-Video-Audio-800-800XL-65XE-130XE/232541246443?hash=item362489d3eb:g:Ey0AAOxytdlQ9xAv Here is your video cable. This is the exact cable that I am using to hook my 800XL to a 720p LG HDTV. The resulting video signal looks *amazing* and seriously almost as good as Altirra does with a PC HDMI out to the same TV. Back in the day, I would have never thought that a stock XL could look so good. 1 Quote Link to comment Share on other sites More sharing options...
Atari030 Posted May 8, 2018 Share Posted May 8, 2018 You should see Svideo. 2 Quote Link to comment Share on other sites More sharing options...
kirby76 Posted May 10, 2018 Author Share Posted May 10, 2018 (edited) It works!! New chips arrived in a day from Best Electronics. The 800xl booted into Basic on the first shot and it is now running my Atarimax MYIDE ][. Tested using their gold plated composite cable on a 13'' Daewoo CRT. Later through the week I will feed it to all sorts of CRT screens especially with the Sophia DVI board. Now I need get this girl up to 256k. She's running pretty. Edited May 10, 2018 by kirby76 8 Quote Link to comment Share on other sites More sharing options...
tjlazer Posted May 11, 2018 Share Posted May 11, 2018 Excellent! Quote Link to comment Share on other sites More sharing options...
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