Re: New (to me!) 9575-0U6 - No Video

On Jan 22, 12:47 pm, "UZnal" <unalz-at-mail333-dot-com> wrote:
Is it possible to change the default video mode, using the reference
disk?

No, this is not something you do with the reference disk (which one?).
During the boot sequence, the XGA-2 will start in a VGA text mode with a
typical resolution of 720x400.
When it detects the 9515 display, for example, it drives it at 39.4 kHz line
rate for 88 Hz refresh rate - that could be too much for your LCD display..

Non-IBM displays used to identify themselves as a 8514 display, which runs
the text mode at 31.6 kHz for 70 Hz, that would be acceptable to your LCD
display.

You could try to change the video mode to 640x480 (LCD-acceptable 75 Hz per
default) after the machine has booted. Do this with a batch file on a
diskette, and see how the LCD reacts to it.

Below is a utility to set the video mode I wrote in 1992. To get the hex
number of the video mode, run "vim", it will list the video modes of 1992..
Examine the first column of the output, it contains the hex number of the
video mode.

For 640x480 the number is 11, this VGA mode can be set with "vim 11"
To restore the default mode, enter "mode co80".

Run these commands from the DOS command line (you will get a command line
running in graphics mode when you enter a graphics mode). For the LCD test,
create a batch file and copy it together with vim.exe to a diskette.

USAGE: vim [hh],  hh = hex number of video mode

www.members.aon.at/mcabase/pub/files/vim.zip

Ah ha! That is probably the problem. None of my displays are capable
of taking any signal at more than 72 Hz refresh.

So, I found a CRT, locally. Being that I live in the middle of
nowhere, I had to take a Dell 17" Trinitron monitor...it's a lot
bigger than what I would have liked, but it does work. I can now see
that the 76 works fine, and actually has 12mb of RAM, and, blowing my
mind, the original IBM 100mb SCSI disk works perfectly! It even has
the factory OS load on it, including the reference partition.

So, now, I need to get a new CR2032 battery for the machine, and it
appears that it will be up, and working. Now, I need to track down an
external SCSI-I (Centronics) case, to install a CD-ROM into. I've
already found the mini Centronics -> Centronics SCSI-I cable,
amazingly.

If anyone has a thought as to how I might lie to the 9576, and have it
think that 72 Hz is the highest refresh rate that the attached (CRT
faked) monitor can handle, I'd appreciate it.

Thanks for the help!

- Alex
.

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