VOGONS


First post, by Jo22

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Hello everyone,

I suppose this had been discussed a thousand time,
but I felt the need to provide some feedback.

In the past years, I had a lot of trouble getting UNIVBE to work on various PCs.

It turned out, well it seems like that at least, that it was because I wasn't mainstream enough.:

The PCs I tried UNIVBE on were having ISA VGAs and 16-Bit processors.
Both seemingly not supported by the common flavours of UNIVBE.

If I was, say, a mentally healthy 486DX4 user with an VLB board or something, I would have never noticed perhaps. 😉

Unfortunately, I wasn't. So I was really asking for trouble, perhaps.:

UNIVBE51 (VBE2 support) required a 32-Bit CPU according to its readme,
but UNIVBE50 didn't mention it and installed in memory on 16-Bit systems,
even boldly claimed to have installed 32-Bit extensions, just to hang everything when really needed.
UNIVESA, by contrast, didn't work either, but at least closed gracefully without crashing.

The only one apparently correctly working on my 286 with an OAK-67 is UNIVBE40.
It loads correctly and is a little bit quicker than the VBE TSR by OAK. It's a bit smaller, also.
Unfortunately, it's VBE 1.x still, but that's okay for now.

Anyway, I just thought I should mention this.

Best regards,
Jo22

Edit: I was judging too quickly. NO$GMB doesn't like UNIVBE40, but is fine with the OAK TSR..

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"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

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Reply 2 of 4, by Jo22

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auron wrote on 2022-05-28, 19:04:

probably a redundant question, but what kind of DOS software can leverage SVGA modes while actually running on a 286?

Hi there! I'm afraid I don't understand the question. 😅

"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//

Reply 3 of 4, by Gmlb256

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auron wrote on 2022-05-28, 19:04:

probably a redundant question, but what kind of DOS software can leverage SVGA modes while actually running on a 286?

Software that predates VESA like PC Paintbrush and they required developer support for vendor specific video modes.

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Reply 4 of 4, by Jo22

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Hi again! I ran the following programs in SuperVGA (native modes) on my 286 @10MHz (with OAK-67):

Windows 2.03 in 800x600
Windows 3.1 in 640x480 @256c (quick), 800x600 @256c (slow, but not related to the 286; uses 3.0 driver)
PV picture viewer
CompuShow 2000

And in VESA VBE via VESA67.COM:
NO$GMB
AutoSketch 3 via VBE driver (ADI)
PV picture viewer
CompuShow 2000

And in VESA VBE via UNIVBE40.EXE:
NO$GMB (failed)
PV picture viewer
CompuShow 2000

With the right SVGA card or if patched, those SVGA games ran, too:
- Wonderland (800x600; PVGA/WD90Cxx)
- Frederick Pohl's Gateway (800x600; ET4000)

All in all, SVGA applications run just fine in my 286-10.
Decoding a JPEG or GIF in 800x600 roughly takes between 10-15 seconds, I believe.
Now let's imagine having a 12 or 16 MHz model! 🙂
Edit: Or a 20MHz, 25MHz model! 🤤

On the other hand, then it likely couldn't run at bus speed anymore (without wajt states).
Beyond 12MHz, ISA cards tend to get bitchy. 🙁
Well, except those 8-Bit cards that use that 4,77MHz clock pin or the 14.31818MHz OSC pin..

"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//