Hey - I have a 15502 PSX - it is as good as new! Some people can actually
look after their things!
ahem
I assume he must have used a mod chip - it is common sense. (Otherwise it is a very good boot disk!)
E-mail me and I will send you mod-chip circuit diagrams, the hex sh^t with which to program them and also the installation instructions.
As to when they were made, the PSX's, I'm not too sure.
Visit
The OFFICIAL philosophy of cheese site - accept no imitations for laughs.
C ya!
SD