Hi Col, I'd suggest digging out the 68k pod manual and looking at the back of the pod. There are details on the address prefix you use to control whether you're doing a byte or word read, and also user or supervisor mode. I think you can ignore supervisor mode for the time being and run some tests using the byte and word address prefixes in user mode. Basically you add a byte value to the start of the address range and these codes determine the addressing mode of the CPU. The 68k will trap if you try to address a non-word boundary, so the fluke or pod is doing a bit of magic to get single byte reads back. I suspect your checksums are a bit dodgy either because you're reading every other byte, or that you're checksumming words when the tool expects byte input. I promise things will become much clearer when you've correlated the back of the pod instructions with the manual section on addressing modes :) It's not just a normal pod. Good luck, Tim Sent from my iPhone On 9 Jun 2010, at 21:29, "Colin Davies" <colin.w.davies@btopenworld.com> wrote:
OK... That kind of makes sense.....When I get my pod pluged into the working board again (once I've fixed the header) , I'll try to do some homework !!!
eg.... read location 0000 in.... and see if its 16 bits and the pair of 8 bits matches the first bytes of both roms :-)
This A0 missing has confused me somewhat, lol !!!
Cheers, Colin _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com http://seven.pairlist.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
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