turning on CGA / EGA / VGA '87 monitors?

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CMcDougall
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turning on CGA / EGA / VGA '87 monitors?

Post by CMcDougall » Mon May 11, 2020 5:30 pm

have a few but a bit scared to turn them on :?

my beeb monitor from 1985 got binned 1992 #-o as it would hardly turn on

I ask as I have a few 8088 (286) PCs , one has composite out on the massive card too (with 5 1/4" disc 8272 FDC), so better to just use that.... :|
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roland
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by roland » Mon May 11, 2020 7:21 pm

For old equipment like radios and televisions with valves we normally "start them up" with a 75W light bulb in series. That way, if there is a huge short circuit then the power will be dissipated by the light bulb and not by the equipment under test. Of course, the monitor might not function properly in this setup.

But before that you should do a visual check of the components, especially capacitors and check with a multimeter if there is no short circuit.
FPGAtom: 512 KB RAM, Real Time Clock and 64 colours
MAN WOMAN :shock:

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CMcDougall
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by CMcDougall » Mon May 11, 2020 8:10 pm

thanks Roland!

good idea with light bulb :idea:

don't think they have old valves, sure the 386 monitor I took to bits to turn up brightness pot never had them, but that was 1992 & can't remember #-o

might put them in middle of back garden with long lead, RCD safety plug & turn on 7m away & watch for a big bang or fizz noise :o
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by CMcDougall » Mon May 11, 2020 9:45 pm

are these any good??
https://www.ebay.co.uk/itm/Arcade-Game- ... %7Ciid%3A1
eeebbbb.jpg
would save a lot of space!! :)

sure I have a VGA converter box to HDMI, up the loft, so could have these to normal new TV....
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IanB
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by IanB » Sat May 23, 2020 1:26 am

CMcDougall wrote:
Mon May 11, 2020 9:45 pm
sure I have a VGA converter box to HDMI, up the loft, so could have these to normal new TV....
RGBtoHDMI supports CGA EGA and MDA from PC
See thread & wiki:
viewtopic.php?f=3&t=14430
https://github.com/hoglet67/RGBtoHDMI/wiki

The gallery here has some sample screencaps from CGA and EGA:
https://github.com/hoglet67/RGBtoHDMI/w ... Screencaps

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1024MAK
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by 1024MAK » Sat May 23, 2020 1:33 pm

roland wrote:
Mon May 11, 2020 7:21 pm
For old equipment like radios and televisions with valves we normally "start them up" with a 75W light bulb in series. That way, if there is a huge short circuit then the power will be dissipated by the light bulb and not by the equipment under test. Of course, the monitor might not function properly in this setup.

But before that you should do a visual check of the components, especially capacitors and check with a multimeter if there is no short circuit.
I show the series filament light bulb method in this post. The lamp will limit the current if there is a fault. If there is no fault, and the current is low, the filament will not get hot and it’s resistance will be low, so the PSU, TV or monitor under test should work (although no guarantees if it’s a lower hungry model).

Mark

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1024MAK
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by 1024MAK » Sat May 23, 2020 1:48 pm

There have been a number of discussions about the ‘Arcade Game RGB/CGA/EGA/YUV to VGA HD Video Converter Boards’. For example, talk about the GBS8200 starts here.

They convert 15625Hz RGB signals to VGA signals.

Mark

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CMcDougall
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Re: turning on CGA / EGA / VGA '87 monitors?

Post by CMcDougall » Sat May 23, 2020 7:40 pm

read a bit more other week, & bought a arcade board for £3.26 in P&P , so need to wait a month for its delivery :?

used the Composite out old 8088 big card machine yesterday, & this old 1982 10mb hard drive still works :shock:
IMG_20200522_201951109.jpg
Video of 'noise' from this 10mb model 4020 )1983)

https://youtu.be/FXp46Ph5TGw
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