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Dwight Elvey
January 25th, 2017, 10:27 AM
Hi
I'm not sure how many have seen my post in the Commodore section.
I'm creating a debug kit for bringing dead KIM-1s back to life.
It included a small EPROM board that plugs on to the expansion
connector of the KIM-1 to take over the boot and run diagnostics
on particular parts of the KIM-1.
At the first level of diagnostic, the only thing that needs to be running is
the processor and the data/address buss.
different levels of diagnostic are selected by a dip switch on the debug board.
Different levels may depend of previous levels working.
The 6502 is not to easy to program without zero page and stack.
One of the common issues with these boards is a bad 6530. This is a mask
programmed part and not easily replaced.
There are a couple replacement boards available on the web that have
a side or end extension board to allow for EPROM and logic, using the 6532
to replace I/O, ram and timer functions.
I will include in the kit a cleaner and small adapter that takes up no more
room than a socket sideways but takes a little more room vertically.
The adapter con be used for either -003 or -002 locations.
After using the debug board to fix your KIM-1, you can use it for storage
of your favorite programs. You can over write the debug code or take advantage
of the unused space.
Most debug code is quite small meaning there is a lot of empty space
in each of the 16 1K selected blocks. The debug only uses about 8 blocks
and only a couple use large chunks of code space.
So, if you are interested in getting your old KIM-1 working,
you might be interested in this kit.
Dwight

glitch
January 25th, 2017, 11:02 AM
Cool! I'd been thinking about designing such a thing myself, glad I hadn't started on it yet :) I'd be interested in one.