Downing's Genesis Portable, "The GeneBoy" COMPLETE!

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Downing's Genesis Portable, "The GeneBoy" COMPLETE!

Postby Downing » February 13th, 2012, 1:12 am

After about 4 weeks, my first portable Genesis "The GeneBoy" is complete!





Updated Specs

Size: 1-7/8" Thick x 4-3/4" Wide x 6-1/2" High
Weight: About 1.5lbs
Battery: 7.4V @ 4Amps
Screen: 3.5" TFT Back-up Screen
Sound/Amp: 1 20mm Speaker & Mini iPod Amp
Power Switch: SPDT On/Off Rocker
Power Charge Port: Single Size M Charger Port
PS1 Controller D-pad
3rd Party Super Pad Controller Board & Buttons
Custom 3 Part Vacuum Formed Casing

All in all I've very happy with how this has turned out! The controls are fluid and responsive and the grip is perfect, even for small hands like mine. Posting some pics of the completed unit below, but are the same mostly as in the video.














*First Post Starts Here* Feb 12th

Started up a new portable today. It will be a portable Sega Genesis 3. Never was much into Sega but the games and the systems are so dirt cheap that it's hard to pass up on eBay!

With that said, this is the latest model Genesis Sega made and was dubbed the "poor man's Genesis". As such, the features are quite lacking, but the trade off in size of the unit is a great help when it comes to portable making.

Specs as follows.

1- Sega Genesis 3 Core System
1- 3.5" TFT Back Up Screen
2- 7.4v, 2000mAh Li-Ion Camcorder Batteries
1- 3rd Party Genesis SuperPad Controller
1- 20mm Speaker
1- Pop-Up speaker Amp
1- Custom DMG Style Vacuum Formed Casing (Same as The Mario/Zelda Tribute)
1- A/V and Wall Power Jack

This will be a very basic system as the core system really can't be much else, but it will suit the purpose. The 3.5" screen was cheap and for the size of the screen and the resolution of the Sega, I thought it best to keep it 4:3 aspect ratio.

Here are some pics of the progress.

A few of the components laid out after disassembley.


The cart slot de-soldered, which I might add was the biggest pain in the ass of any system I've done. I'm going to assume Sega used a different kind of solder than Nintendo because this took forever!


Cart slot roughly mounted with homemade plastic L brackets.


The cart slot fully mounted and in place with super glue, wood, plastic and tapped in screws.


All in all I'm off to a good start and I might vacuum form the case tomorrow with the thicker plastic I have as I'm out of my preferred white .080 stock. Should have it in this week, but I'd rather use this black styrene up anyway.

Anyway, this one I don't anticipate to be as difficult as an N64p or as time consuming as my desk so hopefully in a couple weeks I'll have some work done on this! Keep ya posted!

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Also this is where my Case Making Guide can be found!

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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Zain » February 13th, 2012, 1:19 am

Nice, you'll enjoy playing genesis games. better get truxton :D
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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Bacteria » February 13th, 2012, 12:50 pm

Nice small board.

Some systems use solder that doesn't seem to want to melt; i've come across some, worst being probably Amstrad GX4000; even with applying flux it still resisted!

Is the compatability better than a cart-modded Radica? (i've not tried that mod yet to know myself).
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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Raizer04 » February 13th, 2012, 1:00 pm

Some good ole comix zone on a sega....cant beat it. That and sonic and knuckles!
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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Downing » February 13th, 2012, 1:01 pm

Honestly I couldn't tell ya. I'm going to assume since it's original hardware that compatiablity isn't an issue. I do wonder though as this system does have RGB out if I should do that as opposed to composite, but I can't figure out if my screen has RGB or where I would find the solder points.

Also this system on has "fake" stereo out put, meaning it's mono, but can come out of two speakers if nessessary.

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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Zain » February 13th, 2012, 1:04 pm

It plays nearly every game (99%) can't remember which games it doesn't play

EDIT: I was wrong, it can't play 32X games
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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Downing » February 14th, 2012, 1:25 am

Got the second most tedious job done on the system tonight, the cart relocation. 64 pins for this one and the stripping and the soldering of one at a time is mind numbing, but quite easy on the Genesis as the pins are pretty far apart from each other. (Not like an N64 expansion pak)

That's all the updates I have at the moment. I used 30AWG wrapping wire as the distance in this case was only 2.5" and interference really isn't a concern.



Tomorrow I'll wire up the batteries and the screen and give it a test, or if the electricians in the house are done, I might vac-form my case because the new power layout will make it much easier and less of a concern of shorting my house out. :fried:

More updates soon! Evil Nod, wanna race? I wager I could have mine done in two weeks if I apply myself to it every night after work and full bore over the weekend! :dremel:

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Re: Downing's Genesis Portable, "The GeneBoy"

Postby EVIL NOD » February 14th, 2012, 7:56 am

I think you will have yours done 1st I have still got to wait
For the case to get here and I am still waiting for the batteries
And charger to come in the post.have not had a lot of luck
With sellers on this one.
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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Raizer04 » February 14th, 2012, 8:29 am

Seems like a sega trend has started.....hmm...i wonder who will be next. Keep up the good work guys!!
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Re: Downing's Genesis Portable, "The GeneBoy"

Postby Downing » February 14th, 2012, 12:22 pm

EVIL NOD wrote:I think you will have yours done 1st I have still got to wait
For the case to get here and I am still waiting for the batteries
And charger to come in the post.have not had a lot of luck
With sellers on this one.


Haha, I guess that wasn't really fair of me seems how it's probably my fault you don't have your casing yet! haha. Though I don't imagine that it will be much longer as I shipped it over a week ago now. You should have it by next week or the end of this one. Hope it gets there soon!

Raizer, I dunno if two people = a trend, but it's a break from Nintendo everything for sure, and to be all honest, it looks much easier to do than an N64 and definetly easier than a Game Cube! We'll see how it goes though!

Hey guys, check out my site and sign up to the Blog!
Also this is where my Case Making Guide can be found!

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