Am 1. April 2019 08:11:00 schrieb "Paul Schmidt" <ocleide_at_earthlink.net>: > Almost...... > > > My PET, when it arrived, had the original ROMs, the blue bezel, the integral > cassette desk and chiclet keyboard. Within months, I learned that there was > some anomaly with the circuit board, and if I did not get it fixed, then my > PET would find itself incompatible with the current production in some way, > and I have a vague notion that it might have affected the IEEE-488 > port....as in, "if you don't get this hack done, then when printers and disk > drives come out, you will not be able to use them". IIRC when I wrote the Vice PET emulator I think I saw on some schematics that the EOI line on the IEEE488 was shared with the vertical trace input or something like, but it was a long time ago and my memory on this is getting flakey... maybe someone can check that out... > I returned mine to the > Mr. Calculator at a scheduled time, with the understanding that a traveling > Commodore technician would be coming by and would do some sort of minor > hack, and I never learned what it was that he did....maybe it was on the > bottom of the board. Interesting piece of history... Thanks for sharing > > > > > PaulReceived on 2020-05-29 21:16:05
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