With mixmaster's interest, John Elliott's knowledge and the possible significance of having a generic "Super CGA" module that confirms to AT&T 6300 / Olivetti M24 standards, let's collect that information here
Other Computers that might benefit from emulating is graphics card/mode are the Toshiba T1000SE
, the Toshiba T3100
, some Nixdorf Laptops that TeamE's dumped for me last week, the DEC VAXmate, Brother Geobook and LW typewriters
using Geoworks on a Vadem VG230
chip that supports the resolution, the Olivetti Quaderno
and probably more. There's even a Borland BGI driver
As of now, the Compaq Plasma driver for Windows 3.0/3.1 works if you install it on the Olivetti M24. If you use cga_m24 as graphics card on the Compaq Portable III, it tries to switch into graphics mode, but fails. The driver was omitted from the Windows for Workgroups 3.11 install disks, but can be re-introduced as outlined here.
The GEM driver for the M24 is also reported to work
on the Compaq portable III and 386.
crazyc had linked to the Olivetti M21/M24 theory of operation manual
, and John Elliott
has published the ports and interrupts involved as well as a comparison chart
between different CGA supersets.
mixmaster has asked about switch settings, I'm linking to rather than embedding full size pictures from the inside of the back lid that has the switch settings for, among other things, the internal display.https://imgur.com/84aCLkMhttps://imgur.com/2YeuqLKhttps://imgur.com/1yoiQqR
In addition to my original file
you can download those pictures and some with previously hard to read chip labels here
and on the FTP.
Interestingly enough, the Paradise VGA
chip PVGA1A that I mentioned in the Commodore PC40-III thread retains the AT&T PC 6300 mode.