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Questions regarding 600XL Composite Modifications (simple vs. difficult)


NISMOPC
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I plan on doing this mod to my 600XL if I can...

 

http://atrey.karlin.mff.cuni.cz/~pavel/atari/600xlmon.html

 

I might have gotten ahead of myself. I already removed the 2/3 channel switch and the RF Modulator. I also salvaged a 5 pin DIN connector from a 130XE motherboard and soldered it in place where the 2/3 channel switch was since it already had the locations in motherboard for mounting.

 

Am I able to do the simple modification linked above with the DIN mounted where it is or will there be any known issues? I did cut the trace between DIN Pin 2 and Pin 5 on the bottom of bother board so they are separated, but concerned that some of the other traces are going to circuits on the motherboard that could interfere.

 

I am only planning on using the following DIN pins:

 

2 - Ground
3 - Audio out
4 - Composite video

 

Reason I ask is that I have no interest in installing all the missing components on the motherboard (Best Electronics Vid Mod kit) and am only concerned with composite out, but like the idea of the DIN being mounted properly on the board. Plans to place circular opening where the 2/3 channel opening is.

 

If this poses any issues, I will just do a composite RCA Audio and Video out and remove the DIN connector.

 

Thanks!

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Have you considered the UAV? I got two from Bryan, and have completed installation in an 800XL, and 600XL is next on my list. Ideally I'll even keep the original RF Modulator intact as well. I know it's overkill for your needs, but you would get the best possible composite video, as well as Luma/Chroma for S-Video with simpler wire hookups compared to the referenced article.

 

http://atariage.com/forums/topic/260267-the-uav-rev-d-video-upgrade-thread/

Edited by Nezgar
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Have you considered the UAV? I got two from Bryan, and have completed installation in an 800XL, and 600XL is next on my list. Ideally I'll even keep the original RF Modulator intact as well. I know it's overkill for your needs, but you would get the best possible composite video, as well as Luma/Chroma for S-Video with simpler wire hookups compared to the referenced article.

 

http://atariage.com/forums/topic/260267-the-uav-rev-d-video-upgrade-thread/

Thanks for the link! Have not seen that one. That looks really nice, but just looking for the basics and get away from RF. I am fine with standard composite.

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I'll second the recommendations for Bryan's UAV. I've got four of these in use (two in 1200XL's, one in an 800XL and a fourth in a 2600). I plan to order 3 more for another 1200XL, one of my 7800's and one of my 5200's. It produced SUCH a nice, clean signal - I can't go back to stock Atari video except for S-video on the 800.

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Decided to take the easier route for now. Leaving the DIN connector in place, but not planning on using at this time (potential future full mod).

 

I'm using the original RF Modulator case and will place the components inside. Plan to drill another hole in the RF modulator case and add Audio out RCA Jack. Then drill a second hole in the rear of the 600XL case to expose it next to the Video RCA out (previously the RF out).

 

Used color coded wires to identify the proper connections.

600XL_VID_01

 

I connected the ground as seen in picture to R122 on the board. This grounds the RF Modulator casing to the motherboard as well.

600XL_VID_02

 

Once I receive the other parts in the mail, I'll complete the composite out.

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Change of plans. Removed DIN after realizing something special about the 2/3 channel slot. It fit's a standard USB with extremely minor filing to left/right side of opening. Going to install my SIO2PC internally directly to the SIO plug pins and connect to PC via a USB female plug I salvaged from an old USB PCI board. Will expose the LED's through the top of the case above the SIO plug location.

 

600XL_USB_SIO2PC_01

600XL_USB_SIO2PC_03

600XL_USB_SIO2PC_02

 

Currently held in place with 2 layers of double sided DUCK Brand foam tape, but will need to find a more permanent and solid solution.

Edited by NISMOPC
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  • 4 years later...
On 10/3/2021 at 9:50 PM, hueyjones70 said:

Did this project ever get completed? I would like to see the final connections for the composite connections.

I did finish it and sold it to a forum member back in 2017. Can't find any pictures of the finished mod and not sure where it is now.

 

The link to the document appears to be bad now, but found it via Archives:

 

 

   HOW TO ADD A MONITOR JACK TO A 600XL

THIS MOD IS COPYRIGHTED BY KEN SUMRALL.  HOWEVER, YOU MAY FREELY
DISTRIBUTE IT, AND MODIFY IT, AS LONG AS THIS NOTICE IS INCLUDED
IN ITS ENTIRERTY.  THE AUTHOR MAY BE REACHED AT THE FOLLOWING
EMAIL ADDRESSES:
     ken%hpda@hplabs.hp.com
     ...!hplabs!hpda!ken


Here are instructions on how to add a monitor jack to your 600XL.  This jack
contains the following signals:
   pin            signal
   ---      -------------------
    1       Composite luminance
    2       Ground
    3       Audio out
    4       Composite video
    5       Composite chrominance

The numbering convention for the DIN connector is:

		 3 o              o 1
		    5 o   o   o 4
                          2

This mod for the 600XL provides every one of these signals except the
composite chrominance.  (Actually, the 800 and the XE both supply
the composite chrominance signal, but the 800XL does not.  Adding
the composite chrominance signal to an 800XL is a simple mod that
was described in ANTIC a few years ago.  If you can't find the
mod, send me e-mail, and I will try and find it.)


COMPOSITE VIDEO (pin 4):
To add composite video to your 600XL, you need the following parts,
which are all available are Radio Shack:

     (1) 2N2222 general purpose transistor
     (1) 2.2K ohm resistor
     (1) 3K ohm resistor
     (1) 75 ohm resistor
     (1) 5 pin DIN female connector

Here is the circuit diagram.  It is a basic emitter follower circuit:

                                          +5V
					  ---
					   |
					   |
		+--------------------------+
		|			   |
		|			   |
		|			   | 
		\			   |
		/			   |
	  2.2K	\			   |
		/	       Collector   |
		\		   /-------+
		|		  /
  Signal In	|	Base	|/
    o-----------+---------------|  2N2222
		|		|\
		|		  \                   Signal Out
		|		   \-------+-------------------->
		|		Emitter    |
		|			   |
		\			   \
		/			   /
	    3K	\			   \  75 Ohms
		/			   /
		\			   \
		|			   |
		|			   |
		|			   |
		+--------------------------+
					   |
					 -----
					  ---
					   -


I built this by just soldering the resistors and the transistor together,
and did not put this on any kind of circuit board.  After you have built
this little circuit, you unsolder the 1st wire from the right of the 
RF modulator as you look at it from the front of the computer,
and then solder that to the Signal In of this circuit.
You then connect the Signal Out line to the 1st terminal from the right of the
RF modulator, and also connect it to pin 4 of the DIN connector.  You should
use shielded wire when you connect the Signal Out line to pin 4 of the
DIN connector.  You can connect the ground wire to any major ground point
on the mother board.  I hooked mine to the metal case of the RF modulator.
The +5V line is also available on the RF modulator.  The 2nd pin from the
right of the RF modulator is the +5V power supply for the RF modulator.

COMPOSITE LUMINANCE OUTPUT (pin 1):
To add composite luminance (black and white signal only) to the DIN
connector, connect a 75 ohm resistor between the emitter of transistor Q6
and pin 1 of the DIN connector.  You should use shielded wire to keep
noise from appearing on the line.

AUDIO OUTPUT (pin 3):
To add audio output to the DIN connector, connect a wire from the
2nd terminal from the left on the RF modulator to pin 3 on the DIN connector.

COMPOSITE CHROMINANCE (pin 5):
I have not found a simple mod to pick up the composite chrominance
signal for the DIN connector.  I have not looked terribly hard, however,
since it is possible to use the composite video output as a composite
chrominance signal on many monitors.  That is how my 600XL is hooked up
to my separate composite chrominance/luminance monitor, and it looks
great!

GROUND (pin 2):
I just connected pin 2 of the DIN connector to the metal box that the
RF modulator lives in.  However, you should be able to hook this pin up to
any major ground point on the motherboard.

I was able to mount the 5 pin DIN connector on the back of my 600XL,
between the RF modulator and cartridge slot.  It is a slightly tight fit,
but you can fit it if you are careful.
Edited by NISMOPC
Added details for Mod
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