EGA-VGA adapter

From: Louis Schulman <louiss_at_gate.net>
Date: Sun Feb 11 11:26:14 2001

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?
>
>
>
Received on Sun Feb 11 2001 - 11:26:14 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:33:44 BST