Hallo David, > I have scanned those pages into > http://members.iinet.net.au/~dgreen/c64.html BINGO, thank you, David !!! We knew from other sources that the Vpp = 25V. Your GIF confirmed my yesterday's theory that the ChipSelect-line is used both as programpin and as programvoltagesupply. About the algorithm: I would start with pulses from 10 ms up to 50 ms until the data is stored. But I probably have one problem: is my prommer capable of supplying this pin with 25V ? ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing list
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