UDC short mystery - 2 different cards that both hate my Apple 5 1/4" - Different revs?

["atfphotography@gmail.com" <atfphotography@gmail.com>]

Hello,

I recently resurrected a dead UDC short by swapping in new caps. Also
I was able to pick up a UDC short from a fellow vintage connoisseur
here (thank you ]3ob!).

You can see pictures here;

http://www.atfphotography.com/udc/

I was curious that my original "gold" card is missing parts from the
"green" card. Might it be a later version that didn't need those
parts? I also noticed the green had wire-wraps on the back.

So I couldn't get anything but Apple 3.5" floppy drives to work on my
original UDC short "gold" card. When you put on a Apple 5 1/4" (NON
Unidisk) drive, it would first give out a very large "GRRRRR" and then
just spin the drive with the active light on. One them actually booted
after the roar but only worked once or twice.

I thought it might be the drives but they work just fine on other
cards.

]3ob put up an auction for the UDC short "green" card and two Chinon
drives. The card is working very well and I was delighted to win the
auction. However it also doesn't like the Apple 5 1/4" (non unidisk)
drives.

When the new UDC short "green" came I was excited to give it a whirl.
On the first drive it gave out the mighty roar but then the drive
booted just fine. When I tried a second Apple 5 1/4" drive, it roared
and then just spun refusing with the active light on.

Then I put the original Apple 5 1/4" drive back on and it roars and
then spins with the active light refusing to do anything either.

For further testing I tried a Applied Engineering 3.5" drive with both
cards. It just light up it's green light and machine booted right into
a cursor. Tried a pr#6 and it just froze.

Then I tested a Applied Engineering 5 1/4" drive and it dumped right
into hex.

Thus I could only get the UDC short "gold" & "green" to work with
Apple 3.5" drives (non-unidisk) and the Chinon drives that came with
the second UDC card "green".

Any thoughts? The manual for the card says it covers several more
drives than I am able to use.

The IIe I tested in just had a RamWorks III, a Little Power Adapter II
and the UDC card. The IIe montherboard was from a Platinum machine
(enhanced, etc..).

Maybe picking up the updated BIOS from reactive?

Thanks!

ATF