Exactmidnight Posted January 19, 2020 Share Posted January 19, 2020 (edited) I am in the middle of repairing or attempting to repair an Atari xegs for a local customer. I’m not new to fixing things (I have a multimeter, soldiering iron, etc) but this Atari has me stumped. It’s already had ram chips replaced, but still shows up green when I plug it in with or without the keyboard. However when I accidentally shorted these two resistors (I think) the image on the screen went from green to tripping out. I need help please Edited January 19, 2020 by Exactmidnight Forgot to add it’s an Atari xegs Quote Link to comment Share on other sites More sharing options...
Paul Westphal Posted January 19, 2020 Share Posted January 19, 2020 Here is some info. You may also : Turn on the system for a minute and see which main IC's get hot. I know it's old school, but it can help identify a bad chip.. They also have known issues with the O.S. Paul Xegs Fix.txt Quote Link to comment Share on other sites More sharing options...
andymanone Posted January 19, 2020 Share Posted January 19, 2020 I faced the same issue some times ago... I replaced the defective OS-ROM , after than it works fine again. Gtx., andY Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted January 19, 2020 Share Posted January 19, 2020 As I recall, the last time I had an XEGS which booted to a green screen, it turned out to be a toasted CPU. The previous owner had made the mistake of connecting it to a C64 power supply. (Definitely try replacing the OS ROM first, though; it's the easier of the two to replace, especially if you have an EPROM burner.) Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted January 19, 2020 Share Posted January 19, 2020 As previously mentioned, the OS ROM is a common failure point, but a27c256 EPROM is an easy drop-in replacement. If you don't have the means to program one yourself, PM me and I should be able mail you a programmed chip for $5 USD total. I notice all the chips are nicely socketed - was this your work? That will make it easy to swap IC's with a known working machine. The OS ROM from an XL or XE could be swapped in for testing, but will be missing BASIC and Missile command thats also in the XEGS ROM. Do you hear any sound or clicks when booting the machine? Does it load from a disk drive for instance, even though you can't see the screen? Quote Link to comment Share on other sites More sharing options...
Exactmidnight Posted January 19, 2020 Author Share Posted January 19, 2020 37 minutes ago, jaybird3rd said: As I recall, the last time I had an XEGS which booted to a green screen, it turned out to be a toasted CPU. The previous owner had made the mistake of connecting it to a C64 power supply. (Definitely try replacing the OS ROM first, though; it's the easier of the two to replace, especially if you have an EPROM burner.) This may be a dumb question but where is the cpu on this? I’m used to working on newer stuff aside from a sega gg, so I’m unfamiliar with the layouts here Quote Link to comment Share on other sites More sharing options...
andymanone Posted January 19, 2020 Share Posted January 19, 2020 25 minutes ago, Exactmidnight said: This may be a dumb question but where is the cpu on this? Chip: C014806 Gtx., andY Quote Link to comment Share on other sites More sharing options...
xrbrevin Posted January 19, 2020 Share Posted January 19, 2020 FYI, booting with keyboard loads basic, booting without it loads missile command Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.