Saturday, March 23, 2019

VTech PreComputer/Genius Leader 1000 / 2000 / 4000 Multicartridge

The VTech Genius Leader (PreComputer) was a learning console for kids between 6 and 14 years!

Here is a multicartridge with space for 8 games (8 x 64kb), selectable by DIP.

I always try to design the PCB (size and shape) as close as possible to the original, so that everything fits inside the original cartridge-cases!

Price for a complete ready to use board (PCB + Flashrom + Socket + DIP + 100nf + 3x4K7 + edge connector): 16 EUR

Friday, March 22, 2019

Sega Saturn (Multi-)ROM-Cartridge

As all of you most likely know: The Sega Saturn has two games, which will always need a ROM-Cartridge to get the game started.
So even with a modchip, you will always need the cartridges for these games, otherwise you get just a "Missing ROM"-ErrorMessage on the screen.
These games are "King of Fighter 95" and "Ultraman".

Until now you had to buy the original cartridges for these games to get them started.

But here is the solution! A small Multicart for the Sega Saturn! This cartridge contains the gamedata for both games. Just select the game you want to start with the dipswitch and put the CD into the drive! Voila, enjoy the games!

You can use this Multicart with Original CD's if you have no modchip! If you have a modchip inside your Saturn, you can use this cartridge with burned Backups!

This cartridge can't get used with a PSEUDO SATURN!!

EDIT 21-12-2019:
I updated the pcb-design of this Cartridge and now it fits perfectly inside a case!

Sega Pico Flashcart / Adapter

EDIT 19-09-2021:

THIS DESIGN IS OLD....go to the new design:


I showed the first possible solution for a flashcart in October 2012 (

This solution always needed original donor cartridges from the Sega Pico, specially it were cartridges "Made in Mexico", as these had the socket for a 27C322 eprom.
 As these carts are pretty rare in Europe and will now most likely cost you 30-40euro per piece i made my own Flashcart for the Sega Pico!

But it's more or less a 3in1 Cartridge-PCB now, which fits perfectly in the original cartridge-cases!

1. You can use it as an "MEGADRIVE to PICO" adapter! Which means, you can use ALL your Sega Genesis/Megadrive Flashcarts for the Sega Pico! Just load the Pico-Rom on your Megadrive-Flashcart and put this cart into the socket of the Pico-Cartridge. If krikzz would make a new OS for his Mega Everdrives, even those should work with this!
You can also use his "Flashkit Programmer MD" and "Flashkit Cart MD" with this adapter, to play your Sega Pico roms on the real Pico hardware! (Mega-Version)

2. You can use it as a normal 27C322 Flashcart! Burn your game on the eprom, put it into the 42pin socket and you can play the game on the console. (Eprom-Version)

3. This PCB can also get used to make Replica-Carts or Homebrew-Carts. (Replica-Version)

Monday, March 11, 2019

The Legend of Tonma (Philko bootleg) [MCU decapping]

Hammy bought a The Legend of Tonma (Philko bootleg) pcb a couple of months ago and sent me the 8751H MCU from it to deprotect, decap and read it. (as it was protected and only gave FF while reading)

I received it today and immediatly had to work on it ;-)

So as with all 8751 MCU's, the first part is to remove the top cover. Which was a little bit more work on this chip-package, as it was on all the other 8751's i have done so far.

But after around 10 minutes i got it off and grabbed the nail polish for the next part, to cover the eprom-area on the DIE.

With the covered eprom area, the chip was put inside the uv-eraser for around 20 minutes. Afterwards i did put it into my programmer and tried to read it.

looks like it worked! ;-)

Enjoy another MCU dump for MAME...