AT&T EGA 750 display adapter info wanted

[XMP12-M.CRIPPS]

In article <1428 at lznv.ATT.COM>, psc at lznv.ATT.COM (Paul S. R. Chisholm) writes:
> So far as I understand, it's a fairly vanilla EGA card, except that it
> does CGA (and AT&T 640x400) at 25MHz.  It runs the 319 color monitor at
> the regular (not 25 MHz) EGA frequency, so you *can't* use the 318.
                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^

The above paragraph isn't quite right.  First off, the VDC750 works with
the 318 just fine.  The VDC750 has a dip switch to select the scan rate.
It will work with IBM compatible monitors and AT&T monitors (25Khz, not Mhz).
Furthermore, the 319 does NOT run at the "regular" EGA frequency.  The
manual says clearly that the scan rate switch should NEVER be set to IBM
when you are using an AT&T monitor.  Lastly, the VDC750, while fairly
vanilla by industry standards, does do a 640x400 16-color enhanced EGA
mode (if you can find software to support it).  Note that this mode is not
DEB compatible.

Mike Cripps
AT&T Bell Labs
Lincroft, NJ
mtuxo!mcripps