[Coco] J&M Controller schematic

[Marty Goodman]

Dear Mark (Marlett),

I have an Nth generation xerox of the schematic for the "JFD CoCo"
controller from J&M.  This is a somewhat early model that used the now
utterly unobtainable SY6591 controller chip.

If this is of any help to you, let me know, and I can copy it and mail it to
you.

J&M made a number of controllers in its day... some of them using 1773 28
pin controller chips, others with that odd SY6591 chip.  (I believe they got
some sort of a deal on that odd ball chip at the time they designed the
controller that used it.)


I also have in my CoCo tech library (which I was considering getting rid
of... know anyone who might want it?) schematics for a number of Radio Shack
disk controllers (original, with pots, second generation, and at least one
later generation model), and a HDS brand controller, a Disto controller, and
that J&M controller, along with data sheets for the 1793 and SY6591
controller chips (can't recall if I have data sheets on the Fujitsu
controller chips that were drop in replacements for the Western Digital 40
pin models, except that they were 5 volt only operation, but I might).

---marty