Reset button for Consolized Game Gear Project. Posted: Mon Dec 17, 2012 7:37 pm Hello folks!

Dec 14, 2010 Developing a Sega Game Gear flash cartridge. Anyone know if the game gear screen is reuseable (ie pinout. I bought a 15-in-1 Game Gear cartridge. Several different revisions of Game Gear main PCBs were created, and there may be more to be found. The two smaller PCBs located in the rear half of the case appear. Pinouts - Documents - Maxim’s World of Stuff. This information is collaboratively maintained here. Dev: Pinouts- Index. This page remains only as a remnant of.

I recently started repairing an old game gear with the aim of permanently consolizing it. I have a work log on the Sega-16 forums! I cant post link because im too new but if you want to take a look please head there, its a fresh thread:) My current question is how to properly implement a rest button on the game gear? Sure i could just have a switch that momentarily disconnects the power supply but that seems needlessly stressful to me, i though the reset was a softer process. I found a link ( that i cant post ) for a page that is hosted right here on SMSpower with the cartridge pinout of the GG. Seems like pin 39 on the cartridge connector is labeled Reset and its High under normal operation.

My thought Is that if i could have a button disconnect the trace leading to 39, i could use it as a reset. Maybe that's not the proper way to do it, I wish there was a Pinout for the ASIC, maybe there is a reset function built in somewhere in the GG.

I thought this was the right forum to ask about this, if no better ideas are offered i will try as i stated and will cut pin 39 and switch it. Thanks in advance:).

Posted: Thu Dec 20, 2012 3:53 am Well, I analyzed the circuit for the Reset in the SMS. What the reset does on the SMS is that it grounds pin 22 of the 315-5216 The fun part is that if I look at the pinout of the I/O controller on this very site, It says this pin is NC. Well, not completely true as its linked to the reset and grounding it resets the SMS. On the genesis model 1 VA3, by opposition, the reset button sends +5v on some pin of one of the ASIC. So apparently the Reset always have something to do with one of the SEGA ASIC.

There is possibly a pin on the GG Asic that serves this purpose but i guess finding it is a lost cause without a pinout of the ASIC. The reset circuit is just a resistor and a capacitor. The resistor to VCC, the capacitor to ground and the reset is the point in between. It's acceptable to short the reset (/RST) line to ground in order to reset the console. Because you are essentially shorting out the reset capacitor, I would recommend a series resistor (maybe 220 ohms or something) to limit the momentary current through your reset switch.

Thanks for this! Did you follow the Pin 39 trace and found these components? I tried to follow the trace but lost it under the ASIC. Programs For Omnia I8000. Im using a 1 ASIC VA1 837-9024 board by the way. Or maybe this is a standard way of doing a reset on any kind of circuit?

Sry if I ask alot of questions im trying to learn stuff as im doing this. I will try grounding pin 39 via a 220 ohm resistor.

Posted: Sun Dec 23, 2012 5:55 am I swear, this thing is annoying me to the Utmost. I tried a few things but im working half blind. I tried shorting pin 39 to ground using a resistor as recommended by viletim but It does not work unless i used something lower than 100 ohm. Otherwise the voltage drop is not big enough.

I touch only the contacts for a split second and it Does reset if i get the resistance low enough but then the audio glitches horribly during the bios screen. It gets normal after the bios screen though. I actually tried shorting pin 39 directly to ground for the fastest split second and it reseted without glitch. But because i do not know where trace to pin 39 comes from, this might be a good way of putting unwanted current strain on some component and frying the damn GG. To limit the amount of exposure to potentially damaging current on some part, I added a 10 uf cap ( negative to ground ) and touched pin 39 to the positive lead, to get only a very short voltage drop spike. It works but i still have the audio glitching. I guess I really need to find out where Pin 39 connects to.

I might be better off using a cap and resistor circuit to make a short voltage drop directly the whole 5v rail, instead of doing what i was just doing. I think it might actually be safer and would basically reset everything. But then that is actually what i was trying to avoid, using brute force.