11 Feb
2001
11 Feb
'01
12:07 p.m.
At 12:33 AM 2/11/01 -0800, Mike Ford wrote:
A friend of mine sent me this message, but I really
don't have a clue about
EGA "intensity" or how to wire the adapter. Suggestions?
I believe I'm making an EGA-VGA adapter.
I found the pinouts on http://www.monitorworld.com/faq_pages/q17_page.html
The problem I find is that VGA is analogue and EGA is/was TTL based (digital)
This is exactly right. TTL vs analog. Most multisyncs will do the EGA scan
frequencies. You should be able to create a circuit that looks something like:
|\
R -----+ >-------\/\/\--+----- Red out
| |/ R1 |
| |
| +-----+ |
+-+ | |
| AND +---\/\/\--+
Intensity -+ | R2
+-----+
And repeat it for each color. (intensity is common to all of them) This way
you get three colors from each 'gun' with The following truth table:
Red Int Output
0 0 off
0 1 off
1 0 1/2 output
1 1 1 full output
Note you will need to power this circuit.
--Chuck