SEGA GameGear Flash Cart - Custom Electronics

Snow_Cat · **Posted:** Fri Jan 07, 2011 3:14 pm

I have a few pics from the interenet, and can fill in the blanks based on the pin-functions of the components.

I was going to be lazy and design around whatever address latch and descrete IC's on I can find on hand since the software interface is well documented and I don't have a pile of Sega mapper chips on hand. But since I don't seem to have my GG any more I will let you decide which approach to take.

also; the SMSpower forum thinks I am a spam bot.

^ - - ^

Gerry_MAN · **Joined:** Mon Aug 02, 2010 10:06 pm **Posts:** 23

Ok Sounds good.

I'll be looking into this later this month once I get my hands around this Altera VHDL language.
I might have a better idea at that point on how to attack implementing a custom Mapper.

That's really bizarre regarding SMSpower? I'll send MAXIM the site admin a MSG regarding that.
Weird... :-)

Talk to you later
-Gerry

Snow_Cat · **Posted:** Sat Jan 08, 2011 2:01 pm

Well, I did the initial traces of the 1990 171-5986B 1M/256K ROM +RAM board last night;
I'll get around to porting it into Eagle or KiCad in a couple of weeks.

Spoiler:

edit: wrong unit used in descrition. :oops:

Gerry_MAN · **Joined:** Mon Aug 02, 2010 10:06 pm **Posts:** 23

Snow_Cat! THAT IS AMAZING WORK!!

This is a lot of work you've done here. Very awesome.

Do you think you'll be able to actually figure out the traces for the uncovered sections of the PCB?
That would be awesome.

I guess the use of the Discrete IC on this RETAIL Eprom cart, is being used for chip selection between the two 512KB ROM chips.
Do you think that is the case here?

Sort of the same way NES carts where the CHR and ROM chips share the Address or data bus.

That would be really cool if that works.

Great work!

-Gerry

batteries · **Joined:** Tue Mar 01, 2011 6:27 pm **Posts:** 40

I don't have anything technical to add. I just wanted to say a Game Gear flashcart would be so AWESOME.

I really wish you guys the best of luck.

Gerry_MAN · **Joined:** Mon Aug 02, 2010 10:06 pm **Posts:** 23

Finally a DIY Sega Game Gear Flash Cart NOW WORKING !!!

You Can check out the details on My Website or at the Link Below:

512KB version:
http://www.smspower.org/forums/viewtopic.php?t=12734&sid=6048e9f0df95ad05ff80c800035fb683

1MByte Version:
http://www.smspower.org/forums/viewtopic.php?t=12931&sid=6048e9f0df95ad05ff80c800035fb683

Devoted Page:
http://www.smspower.org/Development/FlashCartridgeProjectsByGerryOBrien

You can also check out the detail on my Website at the link below:
http://www.digital-circuitry.com/GameGear.htm

Enjoy!
Regards,
Gerry O'Brien

Gerry_MAN · **Joined:** Mon Aug 02, 2010 10:06 pm **Posts:** 23

I'll be posting my GG console schematics shortly.

Slow going but making some progress.

-Gerry

Kiruha2012 · **Joined:** Fri Aug 24, 2012 2:32 am **Posts:** 4

Gerry_MAN, your project is very interesting, but its only usefull for Game Gear because GBA already has an adaptor which allow user to use microSD cards instead of flash cartridges for storing games.
P.S. I'm has an idea-lets try to make homemade microSD adaptor for Game Gear!

Gerry_MAN · **Joined:** Mon Aug 02, 2010 10:06 pm **Posts:** 23

Hi Kiruha2012,

Actually they already made an SD based GG Flash cart.

My project is just for fun, to build something for electronics Hobbyists.

If you like to fiddle with electronics then my Projects are perfect, but you can always just go and buy one for around $75 - $120 Dollars.

So in short:

Go to my site to build them:
http://www.digital-circuitry.com/

Go to these sites to buy them:
http://www.tototek.com/store/index.php or http://krikzz.com/

Either way....we win !!

FUN stuff!!

Regards,
-Gerry

SEGA GameGear Flash Cart - Custom Electronics

Who is online