Hi Al, > Have you been able to successfully extract the microcode records from a S/32 IPL or diagnostic floppy?
> I noticed that the first track is very different, with very long sectors compared to the > rest of the disk. Yes ! Track 0 is indeed a very special sector. It starts with some sync bits followed by a AM marker and then 2048 words including a CRC. This sector can not be read by any standard floppy controller. I connected a data separator to a 8" floppy drive, then I over sampled the output with a logic analyser. The output was saved as an CSV file. I wrote a special programs that reads this csv file. It looks for the AM marker (some clock pulses are missing) and then reads the 2048 words. Last but not least I verified the CRC with a software routine. Initially it failed, but after including the AM in the CRC is was ok. Do you have by any chance the listings of these micro-instructions ? So far I know they where part of the systems CE manuals. Regards Henk _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
