From: Mike Goodglick <mikey@nrc.com>
Subject: Re: COMPUTER MONITOR?
X-Xxmessage-Id: <A76F920B5401CAEA@gator34.nrc.com>
X-Xxdate: Tue, 5 Jan 93 03:29:15 GMT
Organization: Network 23
X-Useragent: Nuntius v1.1.1d13
Date: Wed, 6 Jan 1993 03:21:20 GMT

Subject: COMPUTER MONITOR?
From: Jayesh Patel, jayesh@andromeda.rutgers.edu
Date: 16 Dec 92 14:53:39 GMT
In article <Dec.16.09.53.31.1992.10330@andromeda.rutgers.edu> Jayesh
Patel, jayesh@andromeda.rutgers.edu writes:
>Hey, I was wondering.....Do you need a specific cable to attach the
>GENESIS to a VGA computer monitor....What kind of cable is it?  Where
>can I get one?  
>
>Is the graphics any better or worse?  How about the movement...any
slower?
>
>THANKS!!!!!
>
>Jay.
I am glad you asked....here is a instructions on how to modify your
Genesis to hand VGA.
I wrote this about 2 months ago.
 
If you have any questions just leave me e-mail.

--------------
Tonight I modifyed my Genesis with almost TOTAL SUCCESS!!!.

What I did was I disconnected the 9-pin modem port on the Genesis
and made that port a RGB monitor connection...Works like a dream!....
Here's the scoop.


Genesis A/V connector (looking from back of Genesis):

                                                   Blue
                                                      |
Negative Combined Sync---- >	0   |	0   <-----Red
          Composite Video --->      0  0  0   <-----Audio
                          Green ---->      0 0 0  <----+ 5 Volts
                                                      ^
                                                      |
                                                      |
                                                 Ground




After Opening the Genesis and unsoldering the 9-pin modem connector,
I connected the following A/V pins to it.


Genesis former modem connector (looking from  back of Genesis):
                         5  4  3  2  1
                         o  o  o  o  o
                           o  o  o  o
                           9  8  7  6



Connected as follows:

DB-9
       Pin                         A/V Function
	1                            RED
	2                            GREEN
	3                            BLUE
	4                            Negative Combined Sync
	5                            (Did not connect)
	6                            (Did not connect)	
	7                            (Did not connect)
	8                            (Did not connect)
	9                            Ground



I connected this configuration to a NEC MultiSync....Here are the
 pin configs for the Multisync:


DB-9
        Pin                       Pin Function
	1                            RED
	2                            GREEN
	3                            BLUE
	4                            H. Sync
	5                            V. Sync
	6                            Red Ground
	7                            Green Ground
	8                            Blue Ground
	9                            Ground


Here is the small problem that I am having....When I use OR just hook
the new RGB video out (even with the Genesis off)...I get a annoying hum
in my speakers....While the RGB cable and the A/V cable are plugged in,
at the same time, I get a kind of rastering type of faint image on the A/V
screen...I also still have the humm.
I also think that the picture is a bit degraded on the composite out.

Benefits:

And INCREDIBLE video image on the RGB monitor...the image is almost
TOO GOOD!...You can almost see each pixal!.

If somebody out there in net land can figure out why I get the Humm &
the raster problem, we will have one hell of a hack here!!
If it requires some additional parts..please let me know...maybe
resistors...blah, blah....dunno, electronics I don't know...wiring I do. 
 
Later!,

Mike Goodglick
mikey@nrc.com
Newsgroups: rec.games.video