forgot to mention,the xt does have the v20 chip.
pc is the blue chip pcPopular xt
maybe why v4 drivers almost work?

xtgold wrote on 2020-03-08, 13:56:

One page said the v4 is only for a 286 or better.
Is there any v3 of the drivers?
I tried 1.06,2.03,2.12 all those say no device detected.

I looked thru the "wayback machine" and from 5/1999 at version 2.1 and in 10/1999 they list v4.0. No v3.

v1.06 on a celeron 550 for testing purposes gives me the divide overflow error when it loads.
I know there was a turbo pascal patch for .exe files but never heard of one for .sys driver files.
On the xt it just doesn't detect the backpack.
I believe the device was the 8x cd,I bought it for the guts and tossed the case and drive.
165550 which 2.06 should work but doesn't.
there was a v3 but for windows only.

For those playing along at home, the V4 of the drivers comes bundled with a dos program called testport that will check the parallel port to see if it is epp/ecp/uni
The program works all the way back to dos 3.30

I think I used tiramisu for that type of recovery back then.
You can still find it with an ftp search site

One of the programs I lost was called jacket.exe
It would print out the sleeves for a 5 1/4 inch floppy with the directory of what you were putting on,with cut along the dotted lines and fold/paste to make a sleeve for the floppy.Would come in handy for dvd's cd's in this era.It expected a parallel printer and had no option to save to file.So for modern use that would have to be fixed.
I did find that one with an ftp search and actually the basic program version.The basic would just work with the A or B drive tho taking a quick look at it.

The program may be actually looking for an AT keyboard.
A keyboard related program from the old days mentioned if the keyboard didn't have port 64h the xt would lock up.
Which is what it is doing.I may have to put an xt/at switch in,boot XT load the driver AT then switch back,maybe.