Hello, I'm looking for a playstation 1 sdk, I really like to make games for the ps1 and I'm wondering where I can find one? Thank you.
Problem is that you'll need hardware too. An old machine with isa slots and dos,windows 95, and the psx board set. It's not for the novice, it's not GUI level stuff. You're going to have to do a lot of reading.
You could always develop using an emulator to test most of the code. Results aren't going to be 100% accurate and some illegal operations allowed (Xebra and no$psx should help catch these), but it's a good start.