Re: Disk ][ vs. Duo Disk controller cards

[dalloff@freenet.columbus.oh.us (Dave Althoff)]

Basil Wilson (basil@rain.org) wrote:
: Could someone please tell me the difference between a Disk ][ controller
: card vs. one for the Duo Disk drive unit? A couple people have told me they
: are the same, but they do not look the same and the connectors are different.

: I need to know which cards are capable of running a Duo Disk drive unit and
: if there are any special cables needed. Thanks.

The cards are exactly the same except for one minor detail.

The Disk ][ controller has two 20-pin IDC-style connectors, one for each
drive.

The DuoDisk controller (also known as a Unidisk 5.25 controller...again,
both are identical) has, in place of those two connectors, a pigtail with
a DB-19 connector.

--Dave Althoff, Jr.
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