Buster-11

[x56h34]

You will have a very hard time locating a DMAC 4. The other chips are much easier to find. It should also be noted that you shouldn't install Ramsey 7 without DMAC 4 (or vice versa) as they must be used in pair.

I have all of them available for sale (Buster 11, DMAC 4, WD SCSI 8, and Ramsey 7). All are tested and guaranteed to work. Only the DMAC 4 is used, and the rest have only been used once for test purposes, so they more or less NOS (new old stock). Make me an offer I can't refuse. ;-)

[x56h34]

They are used in pairs and were programmed with instructions which tell a:

* DMAC 2 to expect a Ramsey 4 and vice-versa
* DMAC 4 to expect a Ramsey 7 and vice-versa

At least this is what C= advertised, and what the word "on the street" is. I've never tried to combine either type/revision in order to see the effects.