This mod has been a long time in my head and I am happy to make it become real now

The Sega CD-X is a little great unit, you can take with you as a CD-Walkman and it includes a complete Sega Genesis and a Sega CD in one unit.

After done the previous modding of Genesis 2 in combination with Sega CD 2 and 32X I done the same for this little beauty.

We can offer you the complete modding, at our website: www.wolfsoft.de

The shielding carries GND for the Mainboard. It will not work without it. For testing you can use a wire like the following pictures:

The battery have to be replaced its a solder Version of ML 2016 (3V) Li-AL Rechargeable Batterie.
Modell: ML2016-LF (Maxell)

http://datasheet.octopart.com/ML-2016-T25-Maxell-datasheet-558430.pdf

After removing the shielding you can find the jumper for 50/60Hz and the Country Settings

The default for a europe unit JP3 is set and JP2. You will have to remove any jumper you will find

at JP1, JP2, JP3, JP4.

Some more Info about the Jumper Area:

The circuits are going straight to the big SEGA 315-5660 IC

Pin 46 at Sega 315-5560 -> 50/60Hz switching. GND= 50Hz and 5V = 60Hz (JP3, JP4)

Pin 107 at Sega 315-5560 -> Country settings. GND= jap. and 5V = engl. (JP1, JP2)

Now its time to make use of a PIC 16F630 with sebs Code.

red wire 5V, black wire GND, pink wire 50/60Hz, purple wire country setting

Now we have to take the 2^nd Mainboard (CD-Area). We have to mod the Display with two Duo Leds. First you have to remove the shielding.

Desolder the Display Unit.

• Remove the two original LEDs.
• Use some tape and double sided adhesive tape
• The Center of the 3 pins of the DUO-LED is GND. Solder both to the GND Area of the mainbord
  (I used some fiberglas pencil)
• make space for the legs of the LED at the PVC of the Disyplay

use four 220Ohm resistors and head shrink tube to avoide short curcuit.

Here you can see the routing of the 4 wires bounded with some tape.

Now it is time to get the „power“ over the reset button. It is placed on the CD-Mainboard. Lucky the Signal is going through the 36 Pin Connector on the left site.

You will have to cut pin 11 at the outersite of the connector.

PIC Pin 13 grey is connected to the upper site. Its for the Reset switch

PIC Pin 11 white is connected to the lower site (Reset Sega 315-5660 IC Pin 78)

Rom Part – for playing Cds around the world

You are in need of a Eprom (27c2004) and burn all 3 bios Version into it. The usa, japanese and pal Version. You can select the different Bios Version via A16 (Pin 38) and A17 (Pin 39) of the Eprom.
The order is: USA-> JPN -> EUR.

You can do it by yourself. Take the CD-Bios Versions and make a byteswap each of them.

The concat the 3 Files via Windows Commandline copy

copy /B usa.bin + pal.bin + jpn.bin switchless.bin

The final goal is to get 2 wires from the 16F630 PIC to the Eprom.
Here we make use of 2 wires from the Sega Expansionport.

First you have to disable to onboard bios. Desolder PIN 2 (CS) of the onboard ROM and lift the pin up. Solder a red wire from the lifted Pin 2 of the ROM to Pin 40 (5V) of the ROM.

Now its time to prepare 38 wires each 5-6 cm and do some soldering

Wire blue and yellow as you see on the picture. This to wires will do the Bios selection:

red and green coming from the 5mm Duo-Leds. Solder both parallel to PIN 5,6 of the PIC

Adding Sega 32X Support (optional)

The pink wire to the AV-Port is optional, only necassary for 32X support

You will have to cut the red marked circuit and solder a pink wire to Pin 6 of the AV Port

We will disable the Mono-Audio for this function. This will not be a problem, because STEREO-Audio is still working. (Who needs mono ?)

On the right picture you can see the right routing for the wire:

To prevent short circuits use tape on the left site of the CD-X.
Here you can see the routing of the LED wires.

Make sure no red/green wire is nearby or inbetween of the 36 PIN connector between the two mainboards:

german:

you can see the different colors:

http://www.youtube.com/watch?v=gaQCTsi3c6c

Inspired from petes fabulous site www.mmmonkey.co.uk and his switchless mods,

I want to make the ultimative Sega Genesis 2 switchless MOD including 32X and Sega CD2.

In the beginning we have to mod the Genesis 2 with the switchless mod, like I done before.

(Thanks to SEB for the great PIC Code).

Difference between standard Sega Genesis switchless mod

For making a 32X working you are in need of the pink wire. This signal is needed in the 32X.

We can make use of the A/V connector cable between the Genesis 2 and the 32X. The Mono Audio Signal is not in use, so we can cut the original Mono signal at the Genesis 2 A/V connector and the 32X A/V connector.

Here you will see the Sega Genesis 2 switchlees mod including the 3 more wires (yellow, blue, and pink).

The Pink is needed for the 32x.

Blue and yellow is needed if you want to make a Sega CD working too.

For 32X support add a 2^nd pink wire to Pin 12 of the PIC.

At the solder site you have to cut the cirquit path to Pin 6 of the A/V Port and solder the pink wire to Pin 6 of the A/V Port.

For Sega CD support you have to cut Pin A01 (yellow wire) and Pin A30 (blue wire) of the Genesis Expansionsport and solder the 2 wires to the PIC Pin 10 blue and PIC Pin 8 yellow.

Backsite of the Genesis 2:

Adding 32X support

First you have to open the 32X and remove the shielding.
The only protection of the 32X is the 50/60Hz settings. You will find it at the right site of the mainboard IC12 SEGA 315-5788.

You will find R43, if its a PAL 32X (Pin 32 to GND) -> 50Hz
You will find R42, if its a NTSC 32X (Pin 32 to 5V) -> 60Hz

Remove the Resistor

Sega Genesis 2 A/V Pinout

On the solder site you will have to Cut the cirquit path to Pin 6 of the A/V Port.

Solder one pink wire from AV Out Pin 6 (solder Site) to Pin 32 of IC12 (component site)

Adding Sega CD 2 support

You are in need of a Eprom (27c2004) and burn all 3 bios Version into it. The usa, japanese and pal Version. You can select the different Bios Version via A16 (Pin 38) and A17 (Pin 39) of the Eprom.
The order is: USA-> JPN -> EUR.

You can do it by yourself. Take the CD-Bios Versions and make a byteswap each of them.

The concat the 3 Files via Windows Commandline copy

copy /B usa.bin + pal.bin + jpn.bin switchless.bin

The final goal is to get 2 wires from the 16F630 PIC to the Eprom.
Here we make use of 2 wires from the Sega Expansionport.

Pin8 yellow 16F630->Exp Port Pin A01@Genesis 2->Exp. Port Pin A30@SegaCD2->Pin 38Eprom

Pin 10 blue 16F630->Exp Port Pin A30@Genesis 2->Exp. Port Pin A30@SegaCD2->Pin 39Eprom

Pin A01 and A30 of the Expansionsport carrying GND. There are many ground Signals at the Expansionsport. So we can cut these two of and make use of the free Pins for the Bios select.

First you have to remove the original Bios:

cut the 2 wires left and right (A30, A01)

You will have to pullup Pin 38 and Pin 39 of the Eprom and wire blue and yellow like the following picture

Here you can see the complete eprom attached

Look here for a video showing how the modification is working (german language)

http://www.youtube.com/watch?v=PYxM5u4DBis

english

http://www.youtube.com/watch?v=eQVGKSsld1k

My second german Saturn for switchless MOD was not the same as the first one.

This one got 2 PCBs inside. A smaller Main PCB and a separate Controller Port PCB.

The Mainboard is called: 837-11892-01 PAL.

Here you can find the Mainboard Revision on the TOP Side of the Board

For correct working of the 50/60Hz you have to desolder Pin 1 and pull up pin 1 of IC20.

Then wire it to GND.

Backsite Mainboard.You need to cut the jumper at JP7 (remove the circuit)

Frontsite of the Mainboard (LED Resistors 220Ohm) PIC 16F630 cut the two red marked circuit pathes between JP12 and JP 10

Separate Controller PCB (cut the red marked circuit)

wire colors (upper site grey at the RESET Button, downsite white)

DUO-LED soldering an position at the separate Controller PCB

Some more pictures

Inspired of the great site mmmonkey and sebs great code for the Sega Saturn, I will use the PIC 16F630 in a PAL Sega Saturn.

You are in need of a PIC 16F630 with sebs code, some wire, two resistors 220Ohm and a DUAL Led red/Green.

It is a PC BD SATURN MAIN VA9 Board Pal Mainboard.

If you can’t do it yourself, we can take care of your Sega Saturn

At the solder Side you will find some Jumper from JP 6 to JP 13

Remove the three marked Jumper JP7,JP10,JP12 for Language preparation

remove Jumper 2 (50Hz, 60Hz switching)

to make switching to 60Hz work, you need to desolder and pull up PIN 1 of IC20 and wire it to GND

cut the following circuit path on the Parts Site at the reset switch

Here you can see the wiring of the PIC

some zooming pictures

Here you can see the 5mm DUO Led green/red and the Reset Wiring

Use this way for the wires, so you didn’t cut some during the reassembling

Some background Information

The Language Identifikation is working with IC9: 315-5744 A05 Pin 5 to 8

Pin 5 -> JP 6 / JP 7

Pin 6 -> JP 8 / JP 9

Pin 7 -> JP 10 / JP 11

Pin 8 -> JP 12 / JP 13

(If Jumper 6,8,10,12 is set PIN 5,6,7,8 is set to 5V)

(If Jumper 7,9,11,13 is set, PIN 5,6,7,8 is set to GND)

PIC Pinout / Function

You can change the Modes via pressing the reset Button of the Saturn
If you press the reset button very short -> The Sega Console will do a reset

If you press the reset button around one second -> The console swaps between 50Hz and 60Hz.

If you hold the reset button for more than one second -> The console will toogle:

Led red Japan Mode (think of the red dot in the japanese flag)

Led orange USA Mode

Led green Europe Mode

The usage of the mod in a video:

http://www.youtube.com/watch?v=hf8kXiFLF6M