I know the usual mod here is to put the controls onto the PSone casing and strap some batteries to the back, and either make a custom flip-up CD tray which is actually the PSone screen (like Ben did) or to just keep the original PSone screen in its original casing to flip up.
I want to put two joysticks in the system as well as the buttons and d-pad; so need slightly more width than the PSone case needs (I don't want to put the joysticks in place of the reset or on/off button as someone did), also I want to use mylar speakers as I don't think the PSone speakers are much cop. I also don't want to have the batteries external to the system but internal, and removable, using my half-height Canon 911 Li-ion camcorder batteries.
The system will be thicker than my other systems, but is unavoidable as the CD drive is 21mm thick in itself.
I estimate the following thickness (in order of items assembled):
* PSone screen and board 11mm (screen slightly recessed inside perspex, like on my Mini project, included)
* protective piece of 10thou PVC to stop shorting - 1/2mm
* PSone console board 6mm
* protective piece of 10thou PVC to stop shorting - 1/2mm
* CD device 21mm
* extra clearance for batteries and perspex under CD drive 7mm
* clearance 2mm
* perspex base 2mm
total: 50mm (so will probably end up more like 52mm when done!)
The height of the unmodded PSone console with PSone screen attached is 47mm and 31mm if no PSone screen attached. Length is 155mm and with a memory card included, 185mm thick. Width is 191mm.
My system will be: 52mm thick, 224mm wide and 144mm high. Therefore, my system will be 7mm thicker than a PSone with an official PSone screen attachment, 33mm wider but about 41mm less long (taking into account the memory card, 11mm without as comparison). I intend to make the finger grips on the back of the console slimmer than 52mm, more like about 30-40mm; not sure yet, until rest of casing is made that is.
Thought I would document this guide as I am going along in this forum, link anyone who visits my website to this topic who want to see my PSone modding; then when the project is done, summerise the work on my site (like I did for the N64). This keeps in spirit of this forum and gives me a worklog back here again (hopefully it will get stickied in due course!).
Projects on this forum these days tend to be "kept quiet" or don't end up being finished, so yet another reason to start this step-by-step guide - my contribution to getting this site back on track with project work!
This project will no doubt take several weeks to complete and end up at 30 pages plus!
I will take my time with this project, some days no work, other days lots, depending on time available.
So, here starts my step-by-step guide:
PSone in its glory (no PSone screen attachment); and memory card.

Reverse side - also remove the hidden screw under the label (I had to find it!)..

Opened up, showing the CD drive.

CD drive removed (two plugs holding it in place).

Lift off the shielding and remove the mobo:

Here, you can see the height of my batteries; only a bit thicker than the CD drive; it makes sense therefore to use them. When the back is popped open to insert a CD game, there will also be access to the batteries, so they can be replaced for recharge as required. I could secure the cells in place and put in an external charger port; may consider that, however at this stage, prefer to keep them removable.

My work area, so far, usual mess of bits!

Ok, this diagram looks crap and like a kiddie drawing on acid; but it is actually accurate and represents all the components:
Top layer > bottom:
PSone screen (green rectangle)
PSone screen mobo (orange outline).
PSone console mobo (black rectangle)
Batteries - 2 x 7.4v Li-ions, 4 amps total (brown rectangles next to each other)
CD drive, rotated so it fits (brown shape)
CD (blue circles) - central in system, on back.
outer blue shape - outer casing edges. Interesting shape? The green circles are 40mm mylar speakers.
The joysticks will be at either side of the case at the top, left in middle recess will be the d-pad and on the right middle recess will be the four action buttons. The system will also have the four shoulder buttons and select and start buttons, of course.

Lots of work, looking forward to the challenge!
There are quite a few really good games on the PSone system, so thought I would make this system to do it justice!




