from Takka:

Overview
Disc software UMD2 ISO / CSO when you play in, UMD and the exchange of
Plug-ins are to emulate

Operating environment
PSP-2000/CFW 5.00 M33-3 Works
The work on other versions, I guess,
I do not have confirmation

Install
iso_change.prx to ms0: / seplugins Copy

ms0: / seplugins GAME.txt in, add the following:
ms0: / seplugins / iso_change.prx 1
(The included, please refer to GAME.txt)

At the RIKABARIMODO Plugins,
Enable iso_change.prx is to verify that the

Use
In advance, two sets of software for file names
The first "one 1.iso", 2 second, "one 2.iso" Make like
For example) the first "UMD_1.iso", 2 second "UMD_2.iso"

UMD to play if required by the exchange of
♪ L TRIGGER R TRIGGER to enter the menu
The disk in the left and right or left and right to change the trigger
× Cancel button, ○ Change button to run

At this time, UMD MODE to Normal / OE isofs, after switching it reads,
M33/NP9660, once after switching to sleep, read by recovery begins

CAUTION
When you do not need, ISO, please do not exchange
Minimal error checking is done, may be frozen

Changelog:
v1.2
OE isofs freeze was fixed in

抜差SHI internally reproduce the MEMOSUTE If possible,
M33/NP9660 in, or sleep抜差SHI of MEMOSUTE -> recovery
I do not want to be, but information is Due to the poor can not reproduce.

v1.1
Implementation of the menu
More than 2-Disc UMD support
Thread control MacroFire (by pen @ ClassG) that we use
Text display routines MacroFire (by pen @ ClassG) which, to add to enlarge've used