Olivetti/Logabax/AT&T/Toshiba 640x400 hi-res graphics mode

Discussion about old graphics cards, monitors and video related things.

Olivetti/Logabax/AT&T/Toshiba 640x400 hi-res graphics mode

Postby Jo22 » 2018-3-07 @ 06:01

Hello everyone,

I'd like to ask you a favour..

Inspired by the unknown Compaq graphics hardware in this thread over here,
I did a few tests with the Olivetti 640x400x1 graphics mode.

It seems that Quick-Basic 4.5 does indeed support this mode.
Now I wonder how many PC systems were compatible to this CGA extension.

If you have some spare free time and don't know what to do with it,
please run that little QB program on your old CGA machine(s).

Perhaps we're lucky and some of them do support that mode inofficialy.
Or maybe not. Emulators, such as PC-Speed, ATonce, etc. are also welcome. :)

Any feedback/comments welcome. You can also post some pictures, if you wish.
(Since this is a low-priority topic you may want to use external picture storage, too)


Image


Video: http://youtu.be/k4B0Y7X3WHU

More information:
http://en.wikipedia.org/wiki/Olivetti_M24
http://en.wikipedia.org/wiki/Toshiba_T3100

http://www.youtube.com/watch?v=CsNngpf96Ro
http://www.computinghistory.org.uk/det/ ... iba-T3100/
http://www.minuszerodegrees.net/manuals ... 0Flyer.pdf

http://www.old-computers.com/museum/computer.asp?c=535
http://www.old-computers.com/museum/computer.asp?c=154
http://www.old-computers.com/museum/computer.asp?c=531
Attachments
m24.zip
QB 4.5 "CIRCLE" sample program (slightly altered).
Sets SCREEN 2 (CGA) and SCREEN 4 (Olivetti).
(29 KiB) Downloaded 14 times
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//
User avatar
Jo22
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Location: Europe

Re: Olivetti/Logabax/AT&T/Toshiba 640x400 hi-res graphics mode

Postby Jo22 » 2018-11-01 @ 14:45

Update. I'm currently experimenting with the 640x400 monochrome mode again.
I've found some information regarding the structure of the video memory and its size.

You're still invited to join testing - any suggestions and ideas welcome as always. :)
Attachments
m24_640_400_gfm.gif
Diagram 640x400 memoy layout
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//
User avatar
Jo22
l33t
 
Posts: 3196
Joined: 2009-12-13 @ 07:06
Location: Europe

Re: Olivetti/Logabax/AT&T/Toshiba 640x400 hi-res graphics mode

Postby Jo22 » 2019-3-15 @ 11:57

Hi everyone, by the end of the last year, I started working on CGAView again.
Here's an experimental release that includes some improvements (hopefully) and support for the 640x400 mode.
It also supports crossloading so far, so you can, for example, display these hi-res pictures on normal CGAs, too.

Hope you enjoy! ^^

As usual, please feel free to share your opinions below.
Attachments
cviewx.zip
CGAView X v0.3
Experimental version.
Adds M24/AT&T/Logabax 640x400 mode.
(384.07 KiB) Downloaded 3 times
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

//My video channel//
User avatar
Jo22
l33t
 
Posts: 3196
Joined: 2009-12-13 @ 07:06
Location: Europe


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