On Thu, Feb 2, 2017 at 8:30 PM, Gerrit Heitsch <email@example.com> wrote: > On 02/02/2017 08:26 PM, Gerrit Heitsch wrote: >> >> On 02/02/2017 07:32 PM, Francesco Messineo wrote: >>> >>> And it's dead again :( >>> I was typing the cbmlink bootstrap basic program. >>> I saved it on tape and I was trying the first test runs as it just >>> died on me. >>> Now at reset it clears the video memory and sometimes it displays a >>> few random characters but most of the time the screen remains just >>> blank. >>> I'm going to try to substitute the kernel ROM since on one of my >>> programmers refuses to read entirely (on another one reads fine every >>> time). >>> With no kernel ROM, the screen remains full of characters as it should. >>> Ok... old hardware isn't so easy to fix after all. >> >> >> Could be a bad RAM. As far as I know, the 3032 uses 2 banks of 4116 >> DRAMs. You can swap both banks by desoldering and then crossing 2 >> resistors. If it's RAM, that should make the system behave differently. >> Which ones? For that I would need the schematics... Anyone have them? > > > If the schematics at > > http://www.zimmers.net/anonftp/pub/cbm/schematics/computers/pet/2001N/320349-6.gif > > fit your board, it would be R41 and R42 which you'd have to cross to swap > the banks. > Thanks for the suggestion. I'm going to try also with the pettester kernel that I just downloaded and written to a 2532. If I don't get a better clue, I'll swap the resistors in a few minutes. Frank Message was sent through the cbm-hackers mailing listReceived on 2017-02-02 20:01:59
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