This has probably been done before. But since I couldn't find it I wanted to document it for future use :)
These are pics of the Sony PS1 Scph9001 motherboard versus the Sony PsOne motherboard.Read this article
When chosing which Playstation one to buy
When modding Playstaion consoles into a portable theres one particular thing you must look for when buying your console. The model/model number.
Externally theres really only two types of models that look significantly different: The PS1 and the PSone.
On the outside the PS1 looks much bigger than the PSone but when you open up the case the results tend to very.
The PS1 had many board revisions but the biggest change came in the form of a revised motherboard. The revised motherboard can be found in PS1 models SCPH 9000 - 9003.Read this article
So you have your PsOne and you want to build a portable. And you need to move the optical drive to a better spot. But your solder skills aren't that great. What do you do? Re-locate it the easy way.Read this article
PlayStation / PSone Console Overclocking Guide
I felt compelled to write this guide after coming across a similar, yet not as informative, guide by a Rob Ivy that ran Underground Console Mods, or www.ucm.com, which is now down… The guide was for overclocking the PSX / PSone console from stock 33.6 MHz to 64 MHz, or double CPU speeds! This guide wasn’t very informative, and left the user wondering many things about the mod… Things like, where does this wire go? And… How do you do this mod!?Read this article