(Repling to myself as the wonderfull operator of my mail seems to eat most (all?) replies to the ML from WebMail – previous mail was “sent” last sunday) So, I did some progress in the diagnose : - The 1571 electronic board is okay. I’ve tested it on a known good C128D with good hardware and it operates well. - The head 1 of my “new” mechanic is okay (*) o Moved the head connector one step to the front o Defined 1541 mode “U0>M0” o Formatted successfully a disk (“unusable” as on wrong side and reverse bit order) - Heads of my “new” mechanic seems to be correctly aligned as the freshly formatted disk is readable on my regular C128D using 1541 mode “U0>M0” and Head1 mode “U0>H1” (*) - Remains as possible issue head 0 by itself and the wiring of head 0 : Julian was right ! o Compared impedances of both heads from yellow wire * Head 1 : Red = 20, White = 10, Blue = 20 * Head 0 : Red = 0, White = 10, Blue = 20 o Seems that Red cable for head 0 is cut (*) To test a 1571 with head 1 only, the trick of moving the head connector is not needed, “U0>M0” + “U0>H1” are sufficient ==> Next question will be “Is there any way to reach head 0 soldiers without messing everything” ? Suggestions welcome – Regards - Hervé _____ De : email@example.com [mailto:firstname.lastname@example.org] De la part de hwarin Envoyé : mardi 18 août 2015 01:17 À : email@example.com Objet : RE: C128D/1571 issue Thanks, Wiliam, for instructions about disk alignment, that's instructive and I've never risked myself on this until now... My C128D is not a cost reduced one (it's a plastic case) and I never saw a C128DCR sufficiently close to distinguish drive mechanics, I think it's mecanically similar to "early" 1571 in your document. Effectively, the drive might be misaligned as I have no history of it's operation, but, even misaligned, it should be able to format a disk. The idea of a trouble on head 0 is a possibility that I think to test at first. My idea is the following. - Move the head connector 1 step away (must check to confirm direction) in order to have physical head 1 connected to electronic head 0 - Switch the drive to 1541 mode and try to format a disk If it succeed, then I can go further on physical head 0 issue (or cable or whatever). The drive should not be too disturbed by the head 1 being on air in single head mode, whatever alignment is good or not; right ? If it fails, then I may have either an head 0 (in electronic board) failure or a mechanical failure. To distinguish between a "drive" or "electronic" failure, I may also try to swap electronic board with a known good one that I have right under the hand - should have tried this at first time ! Will update you on my progresses - Hervé _____ De : firstname.lastname@example.org [mailto:email@example.com] De la part de william degnan Envoyé : dimanche 16 août 2015 02:44 À : firstname.lastname@example.org Objet : Re: C128D/1571 issue Try an alignment. It is pretty easy to align the internal drive by attaching an external drive and running the program found here: http://vintagecomputer.net/browse_thread.cfm?id=519 Bill Degnan twitter: billdeg vintagecomputer.net On Aug 15, 2015 8:32 PM, "Julian Perry" <email@example.com> wrote: With error21 (No sync)in most modes, my guess it's likely a failed R/W head on side 0, or failed clamping/damaged head 1 spring. Julian Hi, friends I recently bought a C128D in south of France during my holidays. It was time for testings... - The C128 by itself seems to operate perfectly correctly (that's it - no deep test performed yet) - The integrated 1571 can't read (write) anything. Here is what I've tried so far all 4 tests with any known good disk 1) load "$" => drive not ready (74) in 1541 or 1571 mode 2) switching to 1541 or 1571 mode result to read error (21) [18,0] 3) new command (n0:toto,xx) result to read error (21) [0,0] in 1541 mode 4) new command (n0:toto,xx) result to read error (20) [0,0] in 1571 mode 6526 resealted - heads cleaned spinning and all 3 sensors seems okay Does anyone have a suggestion for next steps ? Regards - Hervé Tous vos emails en 1 clic avec l'application SFR Mail sur iPhone et Android - <http://www.sfr.fr/telephonie-mobile/services-options/services-smartphones/a pplications-sfr/sfr-mail/android?sfrintid=M_email_signature> En savoir plus. -- Best regards, Julian <mailto:firstname.lastname@example.org> mailto:email@example.com Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2015-08-18 01:00:07
Archive generated by hypermail 2.2.0.