GP2X-Colem is a port to GP2X of Colem Unix version 1.0.

Changes:

– Speed improvements, the z80 part has been rewritten using jump tables,
– Emulation accuracy improvements (original hidden frameskip of one has
been removed, and cpu cycles are modified according to ntsc/pal mode)
– Add ntsc/pal option
– Display and save thumbnail images for each save state
– Add several new hotkeys :
. settings such as fps, render mode, auto fire speed
can now be directly modified inside the emulator
(no need to enter in the settings menu)
. quick save / quick load current state
(no need to enter in the main menu)
– Default Hotkeys can now be set in the keyboard mapping menu
(useful to add hotkeys on existing/previous keyboard files)
– Auto-fire mode, press RTrigger+X to switch it on/off
– New graphics and add a simple intro splash screen
– Option to display frame rate
– Option to prevent the blue led to be displayed when
L or R are pressed

http://zx81.zx81.free.fr/serendipity/index.php?/archives/305-guid.html