Why wouldn't it work on a non slim? I think it'd be pretty ridiculous if Sony decided to ignore the millions of 'fat' psps out there.
My guess would be a hardware standard. They've had to stall release (in Japan?) as the microphones supplied don't meet Skype's standards. I can imagine that in the redesign Skype were contacted and they specified some hardware requirement to be added, though I've no idea what. If so, perhaps a hacked firmware could enable Skype on PSP-fats? If not, what hardware revision could account for non-Skype compatibility?
Before you ask, the reason Skype will only work on the PSP Slim & Light (and not the original model) is due to memory constraints. The original PSP (PSP-1000) has 32MB of memory, whereas the newer Slim & Light model (PSP-2000) has 64MB. Nick Sharples had the following to say.
“Although PSP-1000 and PSP-2000 are identical in basic functions, there are differences in hardware specifications to some extent and, for that reason, PSP-2000 may differ in features from PSP-1000. We had studied the possibility of supporting Skype with PSP-1000 but had to give it up because of the smaller size of main memory on PSP-1000 series.”
** Go! Messenger functionality will be available with all models of PSP (PSP 2000 and PSP 1000 series)
He he, guess who missed the important press releases! Still, Internet audio chat can't work with 32MBs of buffer?
8 MB IIRC. Skype conversation isn't parallel to game playing, is it? I thought it was a separate function, and not an in-game voice chat system.
Also added through system software update 3.90, is the Go!Messenger icon, highlighting the commitment shown towards communications on PSP**. Go!Messenger, with the ability for video and voice chat
First, the firmware: on March 18th, PlayStation Portable owners will be prompted to update their firmware to v3.93, which expands support for PLAYSTATION Network titles.
At this time, users of the PSP Internet Radio feature will find 20 new internet radio players to enjoy. The new players are organized into more specific styles of music so that PSP users can easily find what they are looking for and listen to their favorite genres.
Well... I can't upgrade after downloading the firmware. Gave me an SGT90000001 error.