21 Jul
2004
21 Jul
'04
8:49 a.m.
ta - will do. I've grabbed the 6847 datasheet, and
I should have the
In many ways it's the 6883 SAM chip that's central to the Dragon's
hardware (and not the CPU). You _need_ to get the data sheet on that
chip. Then you can check that the DRAM is being accessed (it should be,
all the time, if only for video/refresh cycles). You can also check the
CPU clocks, address decoder outputs (there's a '138 hung off the SAM that
provides chip selects for the PIAs, RONs, etc).
6809 one already. Spare 6809's I have. The 6883 is
socketed on both
Dragon 32 and 64 so if that's dead I could do a swap. Don't think I have
a spare 6847 though, and the one in the D32 is soldered. Of course, it's
likely to be something simpler I expect...
RAM, ROM, PSU, etc...
-tony