It’s a text editor, one that will no doubt be of use, and it’s for your PlayStation Portable. ZX-81’s PSPWrite — take notes wherever, whenever.

PSPWrite v1.2.0 changes:

• Add Recent files menu to load previously opened files (useful to edit several files at the same time)
• Add a kind of bookmark feature to save last cursor position in each recent files.
• Add a simple syntax colorization feature for C/C++ files and Lua scripts. (you can add any other languages in syntax.cfg file).
• Add a status line to display several information such as current cursor position.
• Add command mode to search a word forward and backward or to go directly to a given line number.
• Add history feature for command mode to retrieve previously entered commands.

Download:
PSPWrite 1.2.0 fw 1.50
PSPWrite 1.2.0 cfw 3.xx/4.xx
PSPWrite source code

- source: ZX-81’s web site