From: Michael Huth (enigma_at_mail.lipsia.de)
Date: 2007-04-22 20:45:06
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 André Fachat wrote: > Hi Michael, > > it seems something is flakey in your 8296. > > I don't think it is the PLA, although this ICs breaks quite often. > Do you have an oscilloscope or logic probe? I don't own one myself, but as I am doing my PhD at the moment, I might use one at the university. Though I have to get the CBM there... > Dou you have known-working replacement ICs to check whether an IC > is broken by replacing it and seeing if the problem is fixed? I have some other Commodore stuff, like 1541 IIs that are still operational. I could take out chips from there, if I am sure I dont kill them in the 8296. > > Is the startup beep faster or slower than normal when it beeps? Normal speed, I guess you are thinking of some IRQ spam?!? > > I had a 8296 with a broken VIA 6522 that had some similar problems > (booting into the monitor, sometimes with beep, sometimes without.) > You may want to check that one first. ok. > > You can check this page, it includes links to diagnostic manuals > and a page for PLA replacements. > http://www.6502.org/users/andre/petindex/repairs.html > > André > > -------- Original-Nachricht -------- Datum: Sun, 22 Apr 2007 > 17:20:11 +0200 Von: Michael Huth <email@example.com> An: > firstname.lastname@example.org Betreff: CBM8296D hangs after reset > > Hello, > > after about 1.5 years I tried to reactivate my 8296D, but it seems > to hang now after switching on / or reset. It worked previously. > > The error looks like this: The screen stays black and the CPU seems > to stop at some point. Most noticeable when the startup sound stops > with a permanent sound. The floppys seem to reset ok. Once I had > the screen full of chars, that looked like memory after a power-on. > Once it stopped in the Monitor and when I entered 'x' it showed > ready. and hanged. Once it stopped in the Monitor and the cursor > ran forward producing random chars, when I pressed shift-clr/home > it cleared the screen and hanged. If I press reset short, it seems > to stop in most cases before the startup sound is played. If I > press reset for about one second it plays the full startup sound. > > I took out and in all socketed ICs, to see if it a contact problem, > but it didn't helped. I noticed that UE6 gets quite hot (so hot > you cant keep your finger on it for some time - if you arent a cook > ;) ). > > I read in some forums that this error might be a defect PLA (UE6) ? > There was also written, that somewhere a reverse engineered ROM is > in the works, but I couldn't find any. > > So could this error apply to UE6 and if so, where can I get a > replacement? > > Ciao... ...Micha > >>> > Message was sent through the cbm-hackers mailing list > -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGK60yjH+kqnb44nMRAqi0AJ46Jzae43NIIs59y4MTZORvZsFy6gCeKOut NufA7W7Y0b2FawI4R7tbI8A= =vtO2 -----END PGP SIGNATURE----- Message was sent through the cbm-hackers mailing list
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