EGA-VGA adapter

From: Mike Ford <mikeford_at_socal.rr.com>
Date: Sun Feb 11 02:33:59 2001

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?

Received on Sun Feb 11 2001 - 02:33:59 GMT