[Coco] J & M Systems floppy controller

[Roger Taylor]

At 11:18 PM 9/15/2007, you wrote:
>I looked at the 2732 pinout, and it seems to be compatible with the 24 ROM.
>
>The 24 pin 8k EPROM is the MCM68766, probably difficult to find nowadays.
>You could get the DOS adapter from Mark at Cloud9 tech. It's inexpensive,
>and would allow you to use up to 16K 28pins EPROMS, in 2 8k banks.
>I think you can manually route a wire from the A13 ROM port to the EPROM
>socket, and use the full 16K (minus the FF00 and up)
>
>Kind of sad to hack a floppy controller apart :)  You could probably just
>cut the trace to the SCS pin, that way, the floppy controller would be
>disabled.  Maybe the FIRQ/IRQ pins too.
>
>-Benoit



I'm not sure what logic in the controller went bad, but I tried to 
repair it years ago so for all practical purposes, it's dead and 
subject to a new life of ROM Pak projects now  :)

I like the 68766 idea.




-- 
Roger Taylor