This project is for owners of a SEGA ST-V (SEGA Titan Video) PCB.
The ST-V is a cart based system which allows you to change game by changing a game cartridge. All cartridges are the same physically. There is no keyed connector protection like on the Taito F3 motherboard where a Japanese cart will only fit a Japanese motherboard.
On the ST-V it's the BIOS on the motherboard which controls the region selection. The following types of cart exist:
Instead of buying an extra motherboard to make sure you can play all your games in the language you desire, you can just change the BIOS on the PCB.
Inside each game cart there is region string. The string consists of 4 characters. The possible characters are:
Inside the BIOS there is a region character (offset 0x809). It contains the letter 'J', 'U', 'E' or 'T'. When the PCB is powered the BIOS verifies that the region character can be found in the region string stored in the cart. Failure to find this will prevent the game from starting and a suitable error message will be displayed.
One solution is to burn a copy of an alternate BIOS into a 27C400 EPROM. To save wear and tear on the chip socket you may want to buy a ZIF (Zero Insertion Force) socket as well.
Another solution is to burn two ROM images into an EPROM and then use a technique called bank switching to select between the two of them. This deprececated method is documented here for archival purposes ST-V (SEGA Titan Video) Dual BIOS
However the simplest solution is to use the ST-V MODBIOS created by the talented Joerg Hartenberger. With the ST-V MODBIOS all you need to do is to burn the image into a device equivalent to the one on your motherboard.
The ST-V MODBIOS has the following features:
You will need the following:
Here is a list of ST-V games and which region they will operate in. This list is not a complete list of all ST-V games.
|BAKU BAKU ANIMAL||J|
|DIE HARD ARCADE||UET|
|GOLDEN AXE DUEL||JTUE|
|GROOVE ON FIGHT||J|
|INTRO DON DON||J|
|MARUCHAN DE GOO||J|
|OJAMA THE WORLD||J|
|PUYO PUYO SUN J||J|
|SPORT FISHING 2||J|
|SPORT FISHING 2||UET|
I take no responsibility whatsoever for any damage you might cause to your hardware, yourself or your surroundings when making this BIOS.
"The future of ST-V rests upon our work and your work"
(Text found inside BIOS image)