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Article View: comp.sys.ibm.pc.hardware.video
Article #1196

EGA to VGA/SVGA convertor ? Fooling a monitor ?

#1196
From: Joachim Maes
Date: Sat, 22 May 1999 00:00
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I have to recover the files on a harddisk in an old XT with blownup EGA
Monitor.
His screen can not be repaired and  I don't have a spare EGA Monitor.
The PC just gives the annoying beep (no monitor present) and stops booting.
This makes it impossible to recover the files via laplink.
(Disconnecting the hard disk is not possible, 'coz it has a giant controller
board that can't handle todays clockfrequencies.)

My idea was to fool the necessary lines on the EGA Connector, so that the
booting proces continues and I can recover the files of the old PC; but I
can't find any sources describing which pins the motherboard checks for
presence of a monitor. I was not able to verify the state of the
videoadapter.

Does somebody know which pins are checked by the boot-up routine to check
for a monitor ?
And can they be fooled ?

The other alternative is to build an EGA-VGA Convertor (EGA Connector -> Vga
Connector)
I'm not sure this is a healthy thing to do for my VGA monitor....
So, does anyone has a shematic of a EGA-VGA Convertor ?  Is it possible to
do without any damage ?

I Would be very happy if someone had a solution for my problem.
Joachim Maes
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From: "Joachim Maes" <Joachim.NOSPAM@dma.be>
Subject: EGA to VGA/SVGA convertor ? Fooling a monitor ?
Date: 1999/05/22
Message-ID: <7i6pbm$ab5$1@news3.Belgium.EU.net>
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