Re: Diff. types of Unidisk controller?

[cknoblo@oasis.novia.net (Carl Knoblock)]

Randy Shackelford (shack@onyx.southwind.net) wrote:
> Ben Lai (benlai@unixg.ubc.ca) wrote:
> 
> : I saw a recent ad from Shreve Systems where they are selling a 5.25" 
> : Unidisk Controller card and a 3.5" Unidisk Controller card. 
> 
> : I was under the impression that all Unidisk controllers are the same 
> : (hence "Uni" - disk). Does anyone know what are the differences between a 
> : 5.25 and a 3.5 inch Unidisk controller?  Would I be able to connect a 3.5 
> : Unidisk drive to a Unidisk controller that I got with my 5.25 duodisk?
> 
> There was a drive known as the Unidisk 5.25 at one time. It's the beige
> version of the Apple 5.25 drive. The card that runs daisychainable 5.25 drives
> was called the Unidisk 5.25 card once upon a time. This card will run any
> DB19 connector equipped 5.25: Disk //c, Duodisk, Unidisk 5.25, and Apple 5.25.
> It won't run a 3.5 drive. I have a few 5.25 cards on hand, and early ones say
> "I/O controller 655-0101-" with a revision letter. Later ones say "Apple 5.25
> controller card 655-0101-" some revision letter. I'm not positive but the "I/O
> controller" card may be made for a Duodisk. Unidisk 3.5 cards say "Apple 3.5
> floppy disk drive interface card" and mine from mid '86 bears the numbers
> 603-9107-A and 820-0117-A. This card will run intelligent devices; I've used
> Unidisk 3.5s and a CT-20c hard disk with it.

But to answer the original question about the Shreve Systems 3.5"
Unidisk controller card, are you sure this wasn't called a Universal disk
controller card? Shreve is supposedly selling the Apple II Superdrive
controller card under that name.

-- 
Carl G. Knoblock                     Metro Apple Computer Hobbyists
cknoblo@oasis.novia.net              Member: The Dead Computer Society
cknoblo@delphi.com                   KFest 97 July 30 - August 3, 1997