“Yape is the best emulator of Commodore microcomputer family running on Windows and Unix. The emulator faithfully imitates the C-264 (know also as Commodore Plus/4) model.
It has been written by Attila Grósz, see http://yape.plus4.net for details.
I’ve successfully modified, and port the source code of the version v0.32.4 and it’s now working fine on PSP !”
Website: http://zx81.zx81.free.fr/serendipity/index.php?/archives/114-guid.html