Hallo Philip, > I just replaced the CPU, unfortunately there was no change whatsoever. I already was afraid that this would be the case but it was at least the most easiest thing to check. First some questions: - can you program in ASM and produce BINs? - you can program EPROMs, can you program EEPROMs as well? - if yes, do you have EEPROMs laying around? - if yes/no or no/no, do you have enough EPROMs laying around? The reason for these question, we know my little program works fine so the next thing you should do IMHO is to step things up. You could start with a little program that checks various things like the RAM (at least Zeropage + stack) and the hardware (6522, 6520, etc.). Another thing I'm curious about is what happens around the last and first columns. First only fill the first page with 0..$FF. Then check the columns by copying the addresses $8000+$4C to $54 to somewhere in the next page in the middle of the screen, for example from $8128 on. If you see 'lmnopqrst' then this would mean that the video RAM is written with the correct valus and the display circuit is to blame. But if you see 'ghijhhijk' again then would mean IMHO that the filling of the video RAM already went wrong. You see, enough work to do :) -- ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| URL: Ruud.C64.org De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij overgebrachte virussen. APG Algemene Pensioen Groep NV is gevestigd te Heerlen en is ingeschreven in het handelsregister van de Kamer van Koophandel Limburg onder nummer 14099617 The information contained in this e-mail is confidential and may be privileged. It may be read, copied and used only by the intended recipient. If you have received it in error, please contact the sender immediately by return e-mail; please delete in this case the e-mail and do not disclose it's contents to any person. We don't accept liability for any errors, omissions, delays of receipt or viruses in the contents of this message which arise as a result of e-mail transmission. APG Algemene Pensioen Groep NV is registered in the trade register of the Chamber of Commerce Limburg, The Netherlands, registration number: 14099617 Message was sent through the cbm-hackers mailing listReceived on 2011-05-16 08:00:18
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