Re: Disk drive / controller questions

[pubpc1@library.ucla.edu]

James Noyes <jnoyes@quality.net> wrote:
>David E A Wilson wrote:
>> [looks back and sees the reference to UniDisk 3.5] Oh dear...
>> 
>> Unfortunately my UDC card seems to be unable to drive a UniDisk 3.5.
>> I tried one and it did not work so I have Apple 3.5 drives instead.
>> 
>> --
>> David Wilson    Dept CompSci Uni Wollongong Australia   david@cs.uow.edu.au
>
>DOH!!  I guess I got so set on one track that I misspoke.  Apple 3.5's would be
>acceptable as well, especially since they're more readily available.  But what are
>the chances of using two Disk II's, rather than a DuoDisk?  I have heard rumors of a
>way to connect two Disk II 20-pin connectors to a DB-19 and have them work.
>Possible or not?  I guess I may be asking too much here....

James, the UDC has TWO DB connectors.  The first one is the daisy chain port
and the second accepts one drive.  What you can do is use a 20-pin to DB
converter cable on each of your Disk IIs.  You won't have daisychain ports,
but that dosen't matter.

Connect your two Apple 3.5" drives to the first port by daisychaining them.
Connect one of your Disk II drives to the end of the chain, behind the second
Apple 3.5" drive.  Finally, connect your second Disk II drive to the second
port.

The UDC will magically map all the drives to different slots, 2 drives per
slot (or so it appears to software).

-Scott G.