Hello, > EVERY byte with address xx21 and xxA1 gets corrupted with random > values. So it's the address > xxxx xxxx x010 0001 Is this only in bank 1? Or the other banks also corrupted? Same addresses? > It seems likely to me that something is playing very rudely with > DRAM control lines and overwriting a location in all memory columns at > once. The circuit for the signals /busy1 und /busy2 controls who access the dram. Is here an error? When the access is switch via the /busy1 and /busy2 signals at a time with access to the dram, this must corrupt the memory. > Or maybe it is a different problem. Maybe these locations are not > overwritten by anything, but they are not refreshed? Something causes > these two rows to not be refreshed? Does it make any sense? I don't think so. The refresh makes the 8088 board when the 8088 is running. There is a refresh request signal and the board answer with an refresh grant. The refresh addresses are generated at the CBM-II board. Greetings Martin Message was sent through the cbm-hackers mailing listReceived on 2011-01-25 23:00:09
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