Skeezix has posted in this PSP Emulation Forum Topic a new release of his excellent AtariSt Emulator for the PSP Castaway/PSP version 004b, heres whats new thanks to Skeezix
Release 004b
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NEW: Caching of the database lookups; having it re-scan the disk database every
time got on my nerves quick, so now it caches the lookups to memstick; as
such you only get the 'big hit' once, or whenever you copy over a pile of
new disk images. Subsequent loads will only check new disks, so the lookup
will be much faster each run.
o Side effect -- if you _rename_ files around, you might eventually need
to delete the STCACHE.TXT file as it would become inaccurate. But no biggy,
I doubt anyone will do that..”