11 Feb
2001
11 Feb
'01
11:26 a.m.
Yes, leave "intensity" unattached. If you are lucky, you
will get a picture with 8 colors that otherwise looks OK.
Chances are you will get nothing worth looking at, because
you will not have addressed the sync issue correctly.
Why don't you just spend $20 and get the right kind of
monitor? Fundamentally, EGA and VGA are not compatible
(but yes you might get an acceptable picture). Best
advice: fogetaboutit.
Louis
On Sun, 11 Feb 2001 00:33:59 -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)
VGA (HDB15)
---
1 Red
2 Green
3 Blue
4 Sense 2
5 Self Test/TTL Ground
6 Red Ground
7 Green Ground
8 Blue Ground
9 Key
10 Logic/Sync Ground
11 Sense 0
12 Sense 1
13 Horizontal Sync
14 Vertical Sync
15 Sense 3
EGA (DB9)
---
1 Ground
2 Ground
3 Red
4 Green
5 Blue
6 Intensity
7 No Connection
8 Horizontal sync
9 Vertical sync
So I figure I can safely map (EGA-VGA)
1,2 - 5 (Grounds on EGA to TTL ground on VGA)
3 - 1 (red)
4 - 2 (green)
5 - 3 (blue)
8 - 13 (H-sync)
9 - 14 (V-sync)
See, now theres still the 6th pin on the DB9 - intensity. I have no
clue what to do with this. I figured it was safe to connect the two
grounds on the DB9 to the TTL ground on the HDB15.
Do you have any suggestions about this?