The Icon Bar: General: EGA monitor
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EGA monitor |
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Bonez (07:08 14/7/2013)
TomWalker (08:24 14/7/2013)
Raeddie (08:33 14/7/2013)
Bonez (09:00 14/7/2013)
apdl (09:37 14/7/2013)
bhtooefr (12:48 14/7/2013)
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Bonez |
Message #122477, posted by Bonez at 07:08, 14/7/2013 |
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Posts: 50
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I've recently aquired an EGA monitor which came with a Turbo PC/XT machine. It seems the PC has gone tits up. Can I use this monitor on my A410/1 with RiscOS 3.1? From looking at the User Guide Mode 13 seems suitable.
Thanks in advance. |
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Tom Walker |
Message #122478, posted by TomWalker at 08:24, 14/7/2013, in reply to message #122477 |
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Posts: 25
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EGA monitors are incompatible with Arcs, as they use digital colour signaling and the Arc requires analogue. |
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Holger Palmroth |
Message #122479, posted by Raeddie at 08:33, 14/7/2013, in reply to message #122477 |
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Posts: 58
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EGA uses digital signals, while VGA (and the Archimedes, Amiga, Atari and pretty much anything else) uses analog signals. There might be a (complicated and therefore expensive) converter but there is no way to get more than 64 colours out of an EGA monitor.
AFAIK. |
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Bonez |
Message #122480, posted by Bonez at 09:00, 14/7/2013, in reply to message #122479 |
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Cheers all. I'll put it aside in case I come across another XT class box. |
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David Holden |
Message #122481, posted by apdl at 09:37, 14/7/2013, in reply to message #122479 |
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Posts: 138
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EGA uses digital signals, while VGA (and the Archimedes, Amiga, Atari and pretty much anything else) uses analog signals. There might be a (complicated and therefore expensive) converter but there is no way to get more than 64 colours out of an EGA monitor. Although EGS isn't compatible with the Arc. some EGA monitors can be switched to CGA mode and CGA is compatible. So check this before you give up. |
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Eric Rucker |
Message #122482, posted by bhtooefr at 12:48, 14/7/2013, in reply to message #122477 |
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Posts: 337
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Long story short:
EGA (and CGA) color is digital. EGA is RIGIBI, CGA is RGBI.
What this means is that a color is either on or off (it's not a fully digital signal, just the color selection is digital), with a modifier to change brightness (CGA has one modifier for all three colors, EGA has one for each color), and there's a color decoder circuit in the monitor to handle that.
A digital RGB monitor is very useful for a BBC Micro.
The Archimedes machines, however, are analog RGB. This means that the color decoding circuit needs to be bypassed. It's best if you've got schematics - then you can find the color decoding circuit, and remove the decoding chip(s).
[Edited by bhtooefr at 12:52, 14/7/2013] |
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The Icon Bar: General: EGA monitor |
