Genesis 3 - possibility of S-Video output
Mike G
I took delivery of a Majesco Genesis 3 today (thanks Mark!)
I was surprised when I opened the box - I didn't realise quite how
small this thing was! I love the pad it comes with too - very neat, if
a bit light.
I opened the console up and had a look. It's got a tiny motherboard,
about five inches square. All of the processing stuff is crammed into
a single 208-pin chip, in the centre of the board.
What may be of interest to some of you is that it uses a Sony CXA1645
video encoder - the same chip that's used in the Saturn, Playstation,
and later versions of the Genesis 2.
This chip has the ability to drive a S-Video input directly, so it
shouldn't be difficult to perform a S-Video mod on the Genesis 3. I'll
try and get S-Video working with mine, and I'll report back on my
findings.
--
Mike
Chris Kennedy
1645 data sheet had 75 ohm + 220uf + 74 ohm in line from the pins for this.
Is it as simple as that?
- Chris
"Mike G" <m.a.g...@ncl.ac.uk> wrote in message
news:js04ctoav9sousdr6...@4ax.com...
Chris Kennedy
AND
I was of course referring to the Genesis 2 and 3 and NOT the X'Eye
"Chris Kennedy" <Chris_...@baylor.edu> wrote in message
news:io7x6.34$sD1....@nnrp2.sbc.net...
Mike G
<Chris_...@baylor.edu> wrote:
>Best of luck Mike. Hopefully I can get my X'Eye S-video working again. The
>1645 data sheet had 75 ohm + 220uf + 74 ohm in line from the pins for this.
>Is it as simple as that?
For the 1645, you only need the 75 ohm resistor and 220uF in series
(the other 75 ohms shown is a load for testing purposes, you don't
need to connect it in normal use).
In practice you can probably get away without the 220uF cap, as there
appears to be no DC offset on the outputs. Leaving them out didn't
seem to make any difference to the RGB picture.
In other words, you could just have...
1645 TV
75 0hm
pin 15 ------/\/\/\/\------ C in
75 Ohm
pin 16 ------/\/\/\/\------ Y in
--
Mike
Chris Kennedy
thing on the screen. However - I didn't solder the ground & for all I know I
crossed the lum and chrom to the wrong pins. :-) I did it kinda fast. How
are you faring?
- Chris
"Mike G" <m.a.g...@ncl.ac.uk> wrote in message
news:336bctkq4rki28cts...@4ax.com...
Mike G
<Chris_...@baylor.edu> wrote:
>I tried it with just the 75 ohm resistors today, but I didn't get a single
>thing on the screen. However - I didn't solder the ground & for all I know I
>crossed the lum and chrom to the wrong pins. :-) I did it kinda fast. How
>are you faring?
You have to solder the Ground, I forgot to put that in. You won't get
anything otherwise :-)
Anyway, I'll get my iron out, should have some results later today.
--
Mike
Mike G
Result - perfect S-Video from the Genesis 3 :-)
I connected the wires and resistors exactly as I described, and took
ground from the ground lead of the voltage regulator. Worked a treat.
How did you get on with yours Chris?
--
Mike
Dmitry J. Bodorin
TV!!!!!!!! I do not have Sega's cable.
Maybe does exist vizual radio scheme?
Thank you!
--
Dimi
Chris Kennedy
"Mike G" <m.a.g...@ncl.ac.uk> wrote in message
news:vn0ectk8rj2aelui5...@4ax.com...
Mike G
<Chris_...@baylor.edu> wrote:
>What about the grounds on the chip? Will that work?
Yep - should work just the same.
--
Mike
M. Magdamit
your work on the Genesis 3 anywhere? I'm rather good at soldering, but
I'm not so good with more technical aspects and such. Thanks for the help
if you can provide any!
-Mark Magdamit
ri...@u.washington.edu
neogu...@hotmail.com
Mike G
<ri...@u.washington.edu> wrote:
>Hello! Pardon my ignorance, but will you be posting the schematics of
>your work on the Genesis 3 anywhere? I'm rather good at soldering, but
>I'm not so good with more technical aspects and such. Thanks for the help
>if you can provide any!
I've taken some photographs of the Genesis 3 and internals, and I'll
be putting a page up at a later date with these pictures and a
description of how the mod is done.
--
Mike