+DrVenkman Posted November 29, 2019 Share Posted November 29, 2019 10 minutes ago, hueyjones70 said: I am working on a 800XL that doesn't go to self test when I boot while pressing OPTION. Any ideas of the possible cause. Does it go to self-test when you type BYE from BASIC? If not, then look at a bad PIA or PIA socket. Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted November 29, 2019 Share Posted November 29, 2019 It went to self-test when I typed BYE. I ran the memory test and everything was green. I rebooted with OPTION pressed and it went to self test like it should. I decided to let it run the self test continuously for a while. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted November 30, 2019 Share Posted November 30, 2019 27 minutes ago, hueyjones70 said: I rebooted with OPTION pressed and it went to self test like it should. You probably have dirty contacts in the OPTION key switch if it works intermittently. 4 Quote Link to comment Share on other sites More sharing options...
Sugarland Posted November 30, 2019 Share Posted November 30, 2019 Yes your OPTION is dirty go wash it. Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted November 30, 2019 Share Posted November 30, 2019 It is obvious that I should should check out my OPTIONs. 1 Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted November 30, 2019 Share Posted November 30, 2019 I don't think the problem is with the keyboard, I used two different keyboards with similar results. Also, sometimes when I press the OPTION key I get random letters and characters displayed on the screen. Quote Link to comment Share on other sites More sharing options...
+DrVenkman Posted November 30, 2019 Share Posted November 30, 2019 1 hour ago, hueyjones70 said: I don't think the problem is with the keyboard, I used two different keyboards with similar results. Also, sometimes when I press the OPTION key I get random letters and characters displayed on the screen. Could be an issue with your GTIA and/or its socket. Quote Link to comment Share on other sites More sharing options...
SS Posted November 30, 2019 Share Posted November 30, 2019 Couldn't the problem also possibly be with the socket for the keyboard's ribbon cable? Maybe loose pins? Just a thought. 1 Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted December 1, 2019 Share Posted December 1, 2019 GTIA should be easy to check, ribbon socket cable also. Quote Link to comment Share on other sites More sharing options...
nama Posted December 1, 2019 Share Posted December 1, 2019 On 11/30/2019 at 12:06 PM, hueyjones70 said: I am working on a 800XL that doesn't go to self test when I boot while pressing OPTION. Any ideas of the possible cause. Mine does the same. The OPTION key works fine. Typing BYE works fine, and the computer seems to have no issues. Just won't boot into test mode when pushing OPTION. Weird. Looking forward to the replies. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted December 2, 2019 Share Posted December 2, 2019 Do these machines have an original OS ROM? When you do get into self test via "BYE" from BASIC, do the start/select/option keys seem a little less responsive in they keyboard test that you would expect? Does pressing one of them generate a solid or intermittent tone? Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted December 2, 2019 Share Posted December 2, 2019 I tried with an original ROM and one of the dual OS EPROMS. Same results. When I got in with BYE the keys all worked OK for a few tries. I am going to switch out the GTIA and maybe the PIA if nothing shows up there I will run the SALT diagnostic. Quote Link to comment Share on other sites More sharing options...
nama Posted December 2, 2019 Share Posted December 2, 2019 (edited) 27 minutes ago, Nezgar said: Do these machines have an original OS ROM? When you do get into self test via "BYE" from BASIC, do the start/select/option keys seem a little less responsive in they keyboard test that you would expect? Does pressing one of them generate a solid or intermittent tone? I spent a few hours on the weekend restoring this machine, one thing I did was to completely strip back the keyboard and give it a very good clean. All keys are very responsive. I don't think it's been taken apart before, so I'm assuming the ROM is original. Edited December 2, 2019 by nama Quote Link to comment Share on other sites More sharing options...
nama Posted December 2, 2019 Share Posted December 2, 2019 (edited) As hueyjones70 mentioned. If I first test the memory with 'BYE' then reset out, and then press 'OPTION' it seems to work...go figure???? Edited December 2, 2019 by nama Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted December 3, 2019 Share Posted December 3, 2019 I have switched out the large chips and the MMU and the problem persists. Sometimes when I boot I don't get any noise and sometimes I don't get a ready prompt and on those occasions the computer doesn't respond to any commands. 1 Quote Link to comment Share on other sites More sharing options...
hueyjones70 Posted December 14, 2019 Share Posted December 14, 2019 I finally figured out what was wrong, I had installed xx256 memory chips so I could do a Wiztronics memory upgrade and one of the chips was bad. 1 Quote Link to comment Share on other sites More sharing options...
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