The internal BackupRam is battery powered via a changeable CR2032.
With this mod the Backup will never get lost during battery failure.
You have to replace IC 8 (here a PAL Board 837-12135 PX PD SATURN MAIN VA PAL SD)
with a RAMTRON FM1808-70S and lift Pin 22 and Pin 28. Solder the wires to the lifted pins
Pin 22 to GND
Pin 28 to 5V
and you are done 
I found this nice looking 8Bit Cartridgestand @thingiverse
It can hold 8 peaces and I stretched it to fit for all kind of needed Console Cartridges I am using for testing when modding the consoles…
One to rule them all. Flagship of the PC-Engine Fleet -The Supergrafx.
A customer asked me if I can put a SSDS3 inside a Super Grafx and I loved the idea
It holds enough space to put a complete SuperSDSystem3 inside.
Now its possible to have the complete PC Engine Software Library including all CDs in one unit and it looks like stock level.
Removing the original Extension Bus makes it easier to put all the wires to the SuperSDSystem 3.
A lot of wires needed
testing with original RGB Output from the SuperSDSystem3
Removing the original DIN A/V Connetor and replacing with a DIN 8.1 to make RGB
Output via the original A/V Port
a shieded cable to the A/V Port
and with the cover on the backside you see „nothing“.
We call it SuperSDSystem3 inside 
thanks to Vitor Vilea for the great Gradius III port with use of the SA1 Chip.:-)
No its time to make it real. As I done SA1 mods before with a 3,3V Flash chip I used this way
you need:
1x AMS1117 3.3V voltage Regulator Low Drop SOT-223
1x 100nF kerko (yellow)
1x MX29L3211 Flash
1x AS6C1008-55SIN RAM (1M)
I patched the japanese Rom and duplicated it 8 times (not sure if needed).
copy /b g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin + g3jpsa1.bin 8g3jpsa1.bin
use Voltage Regulator with kerko and wire 3,3V to the 3 detached Pins of (33,23,1) MX29L3211
Remove original RAM and free the soldepads from green coat and place in AS6C1008-55SIN
and ready to go without any slowdowns….
optional RegionFix SA1 Cart working on PAL SNES
Lift Pin 127 (5V floating) of U3 SA1 for 50Hz PAL SNES (regionfix)
You can use a 28F1610 instead of the MX29L3211 3,3V Flash
Here you have only to lift pin1 and set pin 1 directly to 5V
I used a SNES DIY Kit and put it into a original NeoGeo Arcade Stick.
And with my old led mod it is a cool wireless device. Working on PC, SNES, Switch, XBOX One,PS3,PS4 with the 8Bitdo Adapters….
a lot of wires…
loading connector with led
light up when pressing
or all four leds permanent on
gunlord wireless with neogeo stick
Easy going remove the old soldered Battery and replace it with a socket and one ML2032 Battery
desoldering
final
some charging (only put the dreamcast on) and you are ready to go
thanks to borti4938, N64 RGB is reaching a new level.
https://github.com/borti4938/n64rgb/blob/master/Guide_N64A_n_N64RGB.pdf
Including deblur, wonderfull RGB Picture, OSD for configuring and more…
I used the new FPC Adapter (thanks to borti)
If you want a mod:
https://www.wolfsoft.de/shop/product_info.php/products_id/15375/
Here you can find some installation pics for a N64 jap NUS-CPU-03 Board
Cutted Pin 3 and used C-Sync from RGB Advanced Borad
(some testing)
As I have open the Super SD System 3 for the Audiofix. I change the Mini Din A/V Connector to my common 8 Pin DIN connector, because I have a lot of consolse fitted with this same connector.
I am not a friend of cables from different sides of a console. So i put both RGB and Power supply in the back and have a nice looking PC-Engine Combo
Pinout RGB
The Powersupply +9V at the red wires GND at the black wires
I used a big diode to avoid wrong input voltage
you can hear a lot of digital noise, when accession SD Card. This fix solve it and we have silence
With the help of a single 10uF 10V Elko its done. Minus at the yellow Cap, Plus to the via
Hi there,
I put a Speedy TDS into a Atari 1050 Diskdrive inspired from Wolfram Fischers Version
