This page comes from William Walsh, the original is HERE.
Edited to fit 600 pixels, titles, and show the components in a table.
I really do not like those darn snaps that are used in the 50 and
70...especially when I don't have the tool handy!
Sigma Data is still around.
They sell assorted hard disk and memory upgrades these days. Most of their
current product lineup looks to be ThinkPad oriented.Their support site
does have files for nearly all of their products. Believe it or not, this
includes the QED adapter.
Because companies don't always last forever, you can also get the drivers
here. I also have the QED/5Z-XXXX
(for 50Z?) and QED/68-XXXX (for Sigma
Data IDE Adapter) files here. Drivers are for OS/2 and MS or PC-DOS.
You download them strictly at your own risk. I can't take any responsibility
for any result of using these files.
QED 70 Riser Front
Grey items are populated on the reverse side of the adapter. P2 is the
"floppy disk A" connector and is the standard "edgecard" type.
|U1 - Lattice 20L8BNCS PAL
U2 - Texas Instruments 16L8 PAL
U3 - Samsung 74HCTLS174N
U4 - Samsung 74HCTLS174N
|U5 - Lattice PAL 16L8BCN PAL
U6 - Samsung 74HCTLS245N
U7 - Samsung 74HCTLS245N
QED 70 Riser Back
|J1 - IDE Connector
JP 1, 2 - no idea
P2 - Reverse of floppy connector
|P3 - Power +5 -5 -12 +12 in that
P4 - DBA ESDI connector
Caution! The Model 70 power supply does
not have an overabundance of capacity. DO NOT use a high power draw drive
with this adapter. Stay under 500mA on both +5 and +12V if you can.
Remember, this adapter supplements your DBA ESDI drive...so
it is still drawing power, along with any optional memory cards, NICs,
CPU upgrades or video cards you may have installed. With only 132 watts
of power available at best, it might not take long to get into trouble
with your power supply or planar.
The hard disk included with mine is marked as a "Quick Easy Disk Part
# QED70/120, S/N 10046" It is a Maxtor 3.5" 7120AT IDE hard disk.
This is a real simple IDE adapter. I doubt very much that it is bootable.
There is no onboard ROM and it does not have a card-ID. The computer it
is installed in boots into OS/2 Warp 3 and loads a Sigma Data supplied
device driver to allow access to the drive. At this time, the computer
locks up when trying to initialize the drive. I have not yet determined
if this is a problem with the drive itself or the controller board. For
now, bypassing the device driver works although I cannot use the drive
This is probably supported under DOS, Win 3.x and OS/2 only--not for
Win95 or NT, as usual... Ah well... The quest will continue for more information
as I have time.