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...
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!
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.
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...
Rear of the block...
The power circuits...
The screen and buttons...
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.
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. 
(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...
