my first portable: The Sega Game Block...

Includes but not limited to: SNES, Genesis, Sega CD, PlayStation 1, Nintendo 64, Dreamcast, Game Gear and I guess the Virtual Boy.

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sam_thornley
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my first portable: The Sega Game Block...

Post by sam_thornley » Fri Jul 06, 2007 8:20 pm

UPDATE: REV 2 Finished go to page 2.

Ive decided to show you all my first Radica based portable...The sega game block! You could say its finished but i'm going to improve it a little over the next few weeks, then show what i've done. But for now heres what ive built...

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The Specs

A 5 Inch Colour TFT Screen (PSONE)

A Speaker

All controlls Start,A,B,C ect

Internal Rechargeable 12v NI-CaD Battery (arrghh! Ni-cad!)

Radica genesis/megadrive Version 2 (i've made it easy to swap to a different version explained later)

The Hardware explained

The system is powerd by a 12v Ni-cad battery. Its from a drill so its a high capacity one. On a full charge i can get up to 2 hours out of it, now i don't think thats bad for a Ni-cad? The 12volts from the battery are fed in to a PSone car adaptor. Its basicly a DC to DC converter that inputs 12v and outputs 7.5v for the psone screen and the radica. The radica appears to be happy with 7.2v as its on-board regulator takes care of this. I conected the audio and video output directly to the psone screen. I used the radica controler board. I cut off the sides and solderd the front pannel buttons to each of the tracks. The case is made from MDF cut out and hot glued together. Then i coverd the rear of the block with black duck tape.

Pictures!

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As you can see below i've screwed the radica on to two wooden blocks. Also i've added a connecter on the audio/video output this allows easy swaping to a differnt radica, when i get bored of the built in games. Like when you swap game PCBs in a Jamma arcade Cab. (this is an old picture the radica now has conectors on the contoller port terminals and the power input). I thought this idea up because from browsing the fourms, adding a cart slot can be quite hard to do.

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Running sonic...

[img]http://photobucket.com"%20target="_blank"><img%20src="http://i108.photobucket.com/albums/n19/Sam_thornley/Portable/working.jpg[/img]

An inside view...

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Rear of the block...

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The power circuits...

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The screen and buttons...

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Well there you have it! My first attempt at a portable. Like i said earlier i'm
going to improve it. Here what i aim to do...

Try to fix the problem with the radica where you cant here sonic jump. (SN76489 volume)

Add s-video to the radica and psone screen.

Remove the sound amp from the psone screen and build a separate one.

LED Mod the Psone screen

Maybe even add a cart slot in the near future...

Id like to hear what you think! Also if ive missed any thing out that you would like to know just ask.
Last edited by sam_thornley on Mon May 11, 2009 1:08 pm, edited 4 times in total.
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CronoTriggerfan
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Post by CronoTriggerfan » Fri Jul 06, 2007 10:59 pm

Wow, nice job! Looks very sleek, good stuff man. :P

Though what's the reason it runs off of 12V? With the components you're using, you could run everything off of a much lower voltage natively instead of having to regulate it.

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sam_thornley
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Post by sam_thornley » Sat Jul 07, 2007 8:49 am

Hey thanks :D The reason i had to run the system on 12volts is because i had problems finding a battery pack that would fit inside the case. Because of how deep psone screen is, it limits the hight of the components that can be placed inside. The only battery i had that would fit, was from an old 12volt drill. So i had to use a DC-DC converter to get the 7.5volts required to run the screen.


But! last night just after i posted the pictures and that. One of the cells on the battery started to leak smelly white stuff out of the top wile it was charging :shock: (I'm using the charging circuit that came with the drill) i've had to rip out the 12v battery for now to stop it leaking everywhere. I'm thinking of trying see if i can get a new 7.2v battery pack with a charger from ebay or something and run the system of 7.2volts like you said. i've also removed the dc-dc converter so the system can run on 7.2v. I'l post some more updates later...
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Twisted Warthog
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Post by Twisted Warthog » Sat Jul 07, 2007 10:21 am

Uhhh nice portable very well done man. But more importantly WTF is up with your Avatar?!

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myuusmeow
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Post by myuusmeow » Sat Jul 07, 2007 10:25 am

Isn't it a little left side heavy though?

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sam_thornley
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Post by sam_thornley » Sat Jul 07, 2007 10:50 am

Twisted Warthog wrote:Uhhh nice portable very well done man. But more importantly WTF is up with your Avatar?!
Thanks :D and yeah my avatar kinda sucks i'll change it :lol:
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sam_thornley
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Post by sam_thornley » Sat Jul 07, 2007 10:56 am

myuusmeow wrote:Isn't it a little left side heavy though?
Yeah it was a little heavy at one side but i've had to remove the battery because it started to leak :shock: I'm gonna install a new one at the bottom of the unit to balance out the weight.
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CronoTriggerfan
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Post by CronoTriggerfan » Sat Jul 07, 2007 11:55 am

WOW. :shock: Shrink your avatar using www.imageshack.com man, that thing is huge!

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sam_thornley
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Post by sam_thornley » Sat Jul 07, 2007 12:03 pm

CronoTriggerfan wrote:WOW. :shock: Shrink your avatar using www.imageshack.com man, that thing is huge!
Hmm...interesting i resized it to 168x64 now its gone back to 640x480! I'l find another image to use...
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Gump-in-space
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Post by Gump-in-space » Sat Jul 07, 2007 1:20 pm

Nice man but why are the buttons reversed?
Gamelver wrote:aw, I thought they were gonna be Gameboys inside the bricks :P.

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sam_thornley
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Post by sam_thornley » Sat Jul 07, 2007 1:44 pm

Well i positioned them so people with small hands would'nt have a problem playing...
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Turbo Tax 1.0
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Post by Turbo Tax 1.0 » Sat Jul 07, 2007 3:38 pm

good stuff,
looks like a nice well made, solid, portable.

and welcome to the forums :D
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Life of Brian
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Post by Life of Brian » Sat Jul 07, 2007 7:49 pm

Hey that's a great portable!
dragonhead wrote:sweet. ive spent a third of my life on benheck!
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gamemasterAS
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Post by gamemasterAS » Sat Jul 07, 2007 8:38 pm

Wow that makes me wanna make one, to bad I have a lack of skillz and screens.
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segasonicfan
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Post by segasonicfan » Mon Jul 09, 2007 2:31 am

Simple yet clean and stylish... I like it :)

As for your aims, let me offer some info/help:

The PSOne screen cannot be modded for S-video. I spent a very long time working on this mod through a thread I started a couple years ago. You can input S-video but the signals ill still be mixed into composite because the encoder circuit is controlled by the Samsung OSD chip which is controlled my an I2C bus. There is no documentation anywhere for the Samsung chip and people have been searching high and low for years. Until that datasheet surfaces I'm afraid this mod (and component input) are not doable.

As for S-video on the radica, check out the Genesis mods section on my website for instructions on how to do the mod. There under the Genesis mods section.

As for the audio amp, I recommend using like the LM386 as a easy and low cost solution. Don't yank the built in amp entirely though because it is nice to be able to use it for digital volume control. You can just tie the output to the LM386 input if you want.

and FYI the LED mod is just not a good idea with the PSOne screen if you care about video quality at all. Even with the finest most expensive LEDs you wont get an evenly lit picture and it will most likely disappoint. I did the mod a while back to find this out the hard way.

and definitely add a car slot :)


-Segasonicfan

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