wille@frith.msu.edu (Jeffrey M. Wille) (04/30/91)
For all of you who have an A3000 with a bridgeboard and would kill
for another AT slot, you're in luck. Before I go on, however, let
me state that if you blow up yourself, or your A3000, I accept no
responsibility. Also, I've only done this for an XT slot, but it
should work equally well to create an AT slot. BTW, in case you're
concerned, you can do this procedure without modifying your A3000.
The basic idea is to run a ribbon cable down from the lowest AT
connector and hang another AT connector from it in the empty
space in the lowest Amiga slot. To do this, you'll need two
AT-style card edge connectors, an AT card edge, and 1" of ribbon
cable. I got the parts for mine from a dead PC motherboard and a dead
parallel card (for my XT card edge). Make sure that you use a
card edge that has nice solder pads. Hack off the edge of your
dead AT card and file it smooth so that you have about 1/16" of card
left next to your solder pads. Bend the leads of one AT connector
inward and insert your card edge between the two rows of leads so
leads touch the appropriate solder pads and solder them in place.
Solder about 1" of ribbon cable onto the leads of the AT connector
that you just attached to the card edge, and solder the other end
onto the second AT connector so that they are in parallel. You'll
probably want to spread the leads of the second AT connector so
that it takes up less room. Insulate the back of second AT
connector, and plug the card edge into your lowest AT slot, and
voila!
This hack takes up about 7/8" of space of your lowest AT slot, but
you should still be able to plug a board into it and get the cover
back on. The hanging AT connector sticks out about 1/4" further
than the built-in AT connectors.
Actual ascii photograph (side view):
AT card edge
|
Lowest AT slot | AT connector
| | |
|
Daughter |====] ____/===] _____AT_Card_________________
Board |====] \===]
| |
| / <--- Ribbon Cable
| /
| |
| |===] _____AT_Card________________
| |===]
I am currently running an AT bridgeboard, a Galil DMC-400 3-axis
motion controller board, and a Data Translation 16 channel data
acquisition board in my A3000....and they all work fine.
Good luck.
_ _ ---------------------------------------------------------------------
( ) Jeff Wille (wille@frith.egr.msu.edu)
( ) _(_ ^^^^ _^-^_ [KF8HZ] (wille@happy.egr.msu.edu)
( ) ( ) / / \ / _^^_
( @@) 00 M @ @/ <@@ > >oo< "Never say anything unless you're
(_^> (^)/ ( ^ ) o / @ sure everyone feels exactly the
Marge Homer Bart Lisa Maggie same way." -- Homer Simpson