MagerValp, could you add Konrad's posting address to the exception table? If the test mode is anything like the parallel programming mode of Atmel AVR microcontrollers (which are about 20 years newer technology), then you'd keep the reset line at 10 volts during the whole process. But this is just a guess. Anyway, assuming that it is a mask-programmed ROM, and that the pin handles 10 volts, there shouldn't be any risk of damaging the chip. Marko ---------- Forwarded message ---------- From: Konrad Burylo <K.Burylo@elka.pw.edu.pl> Subject: 6500/1 test mode questions Hi ! I'm going to dump 6500/1's ROM (from 1520 plotter). I've read the datasheet and now I know how to switch 6500/1 into the test mode. I assume I have to provide 64 bytes, that will be written into an internal RAM. But there is no info on how memory fetches from port C are synchronized. And for how long should I keep 10 V at Reset line ? Any ideas ? Someone knows something about 6500/1 test mode ? I think that for the beginning I should use an oscilloscope and check all the pins - to see if any of them is used as read strobe. But any info will be appreciated... Konrad Burylo Message was sent through the cbm-hackers mailing list
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