Sega Graphic Board

[Virtualogik]

Ok, just found this section...

Any ideas how much this is worth :

http://www.virtualogik.com/images/segagb.jpg

Thanks !

[Virtualogik]

It comes in a plain white box with some stamps from Tonka ... marked 1987 :

http://www.virtualogik.com/images/segaboardfinal.jpg

[Steve W]

Huh, I've never seen anything like that before. Since it's Tonka, it's for the Sega Master System. I wonder if it's a graphics tablet for developers? I'm hoping someone will chime in here with some info!

[slapdash]

I know I've seen it before, but I don't know about the bare card, or the Tonka connection. Looks like this one might be a sample from Sega to Tonka to see if they wanted to distribute it?

[brykasch]

That's definitely a interesting one, seems like a sample to me as well, any paperwork with it at all?

[Bock]

Looks like a western-version prototype of the Japanese Terebi Oekaki (テレビおえかき） released in 1986 for the SG-1000/SC-3000 and compatible with Mark III and Japanese Master System. Original is white.

http://www.smspower.org/museum/terebioekaki/TerebiOekaki-03.jpg
http://www.smspower.org/museum/terebioekaki/TerebiOekaki-picture-01.gif
http://www.smspower.org/museum/terebioekaki/TerebiOekaki-picture-02.gif

http://www.smspower.org/museum/terebioekaki/

It is emulated by my emulator MEKA (http://www.smspower.org/meka) if you want to try it. Because of restriction with the video mode used and the technology used to read the pen it's actually pretty bad to use.

The cartridge board and connection on the pictures match those of the western Sega Master System format (which is different from the Japanese/Korean format).

The Japanese Graphic Board doesn't have those there "Modes" buttons so it suggest that it use a different software. Also the original has the cartridge connected to the graphic board where as this one is separate and communicate via the standard DB9 joypad port (also used by other peripherals such as Sports Pad or Paddle Control).

The original software is 8 KB and use legacy video mode 2 (SG-1000/SC-3000) to provide a simili bitmap mode editing. Although the SMS has more advanced video mode it is less suited than old mode 2 for random bitmap drawing, so I suspect that this software is based on the old software, or if its a new software it would use the legacy SG-1000/SC-3000 video mode.

The 16-bit sum on the EPROM chip doesn't match the existing Terebi Oekaki ROM that I dumped so it's at least a different version of the software (unless the 4-digit number happens not to be a 16-bit sum of the EPROM content but it is generally the case). I can't read from the picture which type of EPROM it is.

This prototype is pictured along with a Megadrive in some ads so perhaps the SMS version was scrapped in the west to make a MD one. etc. There's pictures of a similar prototype but white in German publications so it was also considered to release in Europe I guess, but eventually didn't make it out of Japan.

It's beautiful.

PM-ed (want to buy and dump and emulate! :))