As before, I still don't have a clear picture of how exactly is this supposed to work. Either this or the (presumably simpler) approach with an EPROM and a 4040. I think I am not alone in this and that is one of the reasons nobody (including myself) haven't done it yet. On 25 June 2014 00:14:42 CEST, "Kajtár Zsolt" <email@example.com> wrote: >-----BEGIN PGP SIGNED MESSAGE----- >Hash: SHA1 > >>>> Guys, I have a bunch of the 1520 ploter MCUs... They are 6500/1 of >>>> course. >>> >>> It would be interesting to have the ROM dumped... I've created a >1520 >>> emulation for VICE, but I never could exhaustively test all >incorrect >>> input to it. So while the emulation seems ok for correct input, for >>> buggy programs it may certainly work differently. With a disassembly > >>> this could be improved. >> >> It was one of the main reasons I started the discussion on this >matter >> some two years ago. The KBD controller is just another reason. I am >> still willing to do the experiment, provided there is a well-backed >> consensus on how this should be done. > >Just like two years ago I'm still on the opinion that the easiest would >be >to wire it into an existing 6502 based system where the external >processor >is doing the fetches for the 6500/1 so that port PC would be directly >connected to the external data bus. > >Synchronization could be ensured by using half the clock of the 6500/1 >for >the external processor, and starting them parallel using the reset >signal. >If the phases don't match there are only a few variations to try. > >After releasing the test mode the external processor could handle the >communication with the 6500/1 side by using the other ports and some IO >interface chip. > >But whatever. No one really cared two years ago, so this must be >impractical/unworkable. > >- -- > -soci- >-----BEGIN PGP SIGNATURE----- >Version: GnuPG v1 > >iEYEARECAAYFAlOp+EoACgkQyBOVYiJltRYOfQCeO91g3+muRhX8JUhll3XuOkTe >y3YAoN4sp/8XcAnRGI7M5kSrvGwx0eY+ >=h/PL >-----END PGP SIGNATURE----- > > Message was sent through the cbm-hackers mailing list -- Sent from mobile phone (so please have understanding). Message was sent through the cbm-hackers mailing listReceived on 2014-06-26 12:00:02
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