SEGA ST-V (SEGA Titan Video) MODBIOS

Written by Tormod Tjaberg

Last update: 2008-12-24

ST-V Logo
Soukyugurentai title screen Terra Diver title screen

Introduction

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.


Region selection

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.


Changing the BIOS

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

ST-V MODBIOS Selection screen

The ST-V MODBIOS has the following features:


Parts

Image of ST-V Mask Chip

You will need the following:
NOTE:
The ST-V MODBIOS image is provided for personal use only. You are not allowed to sell the image or sell ST-V MODBIOS ROM's. If you don't have the necessary tools to burn the image yourself, you may purchase an ST-V MODBIOS ROM here: http://modbios.fortunecity.com

Procedure

ST-V motherboard


ST-V Gamelist

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.

Game Region code
ASTRA SUPERSTARS J
BAKU BAKU ANIMAL J
BATMAN FOREVER JUE
COLUMNS97 JTE
COTTON2 JUET
COTTON_BOOMERANG JUET
DANCHI HANAFUDA J
DECATHLETE JTUE
DIE HARD ARCADE UET
DYNAMITE DEKA J
EJIHON J
ELANDOREE JTUE
F.FIGHT REVENGE JUET
FINAL ARCH J
FIND LOVE J
FUNKYHEAD BOXERS JTUE
GOLDEN AXE DUEL JTUE
GROOVE ON FIGHT J
GUARDIAN_FORCE JUET
HANAGUMI COLUMNS J
INTRO DON DON J
KIWAMES J
MARUCHAN DE GOO J
OJAMA THE WORLD J
OTHELLO SHIYOUYO J
PEBBLEBEACH GOLF JUE
PRO_WRESTLING_FV J
PURIKURA SAKUSEN J
PUYO PUYO SUN J J
RADIANT.S.GUN JUET
SANDO-R J
SASI-SU!! J
SEABASS FISHING JUET
SHANGHAI BANRI JUE
SHIENRYU JTUE
SOKYU GURENTAI JUET
SPORT FISHING 2 J
SPORT FISHING 2 UET
SSS JUET
SUIKO ENBU JUET
SUPER M.LEAGUE U
TREASURE HUNT UETJ
V.F REMIX JTUE
V.F. KIDS JTUE
VIRTUAL MAJONG J
VIRTUAL MAJONG2 J
WINTERHEAT JTUE
WORLD CUP'98 JTUE

Disclaimer

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)


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