It turns out that there is a routine in the graphic ROM that checks for presence of the VIDEO ON signal on PB5 of the VIA that is not in the business version; the problem was a broken trace from the PIA to the VIA. m ----- Original Message ----- From: "William Levak" <wlevak@SDF.ORG> To: <firstname.lastname@example.org> Cc: <email@example.com> Sent: Sunday, June 23, 2013 7:43 PM Subject: Re: (Fwd) Re: 8032 crt vs. 3032 crt > > > It would appear from what you said, that it is the ROM itself that is the > problem. You do not say exactly which version of the board and which > version of ROM it is. Addressing is slightly different on some versions. > Also access time of the ROM may be different. > > > On Sun, 23 Jun 2013, Ruud@Baltissen.org wrote: > >> Hallo Giovi, >> >> >> To be honest, I have no idea. So I forward your question to the >> famous CBM-hackers again. >> >> >> ------- Forwarded message follows ------- >> From: "Giovi" <firstname.lastname@example.org> >> To: <Ruud@Baltissen.org> >> Subject: Re: (Fwd) Re: 8032 crt vs. 3032 crt >> Date sent: Sat, 22 Jun 2013 14:54:58 -0300 >> >> >> Hi Ruud, >> >> I have a new question for you! >> >> With some good and expert friends at >> http://www.vintage-computer.com I took >> the decision to fix the original 3032 board. >> >> After fixing some minor problems we arrived at a dead point. >> >> The computer works (boot and answer to keyboard command) only with >> the edit >> ROM for business keyboard. It doesn't work (it hangs with a black >> screen >> while booting) with the edit ROM for graphic keyboard. >> >> We tried with basic 2 and basic 4, of course with correct set of >> Rom/Eprom. >> Same result: ok with business keyboard rom, no way with graphic >> keyboard >> rom. >> >> We checked it with a petester.bin ROM and all seems ok at least >> with this >> simple diagnostic. >> >> It *seems* that some instructions in the edit ROM (at $E000) for >> the graphic >> keyboard make it to hang. >> >> Have you some experience/ideas about this? >> >> I also don't understand if is there any difference (jumpers, >> components...) >> between graphic keyboard assy and business keyboard assy... >> >> cheers, >> Giovi >> >> >> ------- End of forwarded message ------- >> >> >> -- >> >> Kind regards / Met vriendelijke groet, Ruud Baltissen >> www.Baltissen.org >> >> >> >> >> >> >> >> Message was sent through the cbm-hackers mailing list >> > > email@example.com > SDF Public Access UNIX System - http://sdf.lonestar.org > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2013-07-02 06:00:03
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