Dragon 64 fixing...

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Wed Jul 21 15:49:38 2004

> 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
Received on Wed Jul 21 2004 - 15:49:38 BST

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