I dunno if you used my
TurboRip with the /PCEP option, but that was designed with that emulator in mind after helping Bernie to get Dracula X running on his PSP many years ago. You run "TurboRip /PCEP" at the command line, choose the CD drive that your original game disc is in, and it'll rip it to the appropriate ISO/MP3/TOC format that the emulator requires. When/if you manage to fire up the emulator, you load/point it to the TOC file in whatever folder, etc.
EDIT: Doh, I just realized you were talking about a ROM file. An easier process obviously... I kinda skimmed on my first read of your thread. Well, if you wanna try playing a CD game on the system, there ya go anyway!
/PCEP
I once helped a visitor to my site that asked for help in getting DraculaX
to run on his PSP portable using the PCEP emulator. I don't own a PSP, so
that made it rather difficult to help in his problem, but I managed to
succeed in the end. Because of that experience, you now get the benefit of
this special option to TurboRip!!
This option will cause TurboRip to take your original PC Engine/TG-16 disc,
and rip/extract it to an ISO/MP3/TOC archive. What you do next is connect
your PSP memory stick to your PC, copy the archive to it, connect the stick
back to your PSP, load the PCEP emulator, then point it to the TOC file for
loading. The TOC file is what it needs, not a CUE file! Anyhow, if you
follow those instructions roughly, you'll be able to play most
PC Engine/TG-16 CD-ROM games on Sony's PSP portable system! Enjoy!!!!!!
I took a quick look at my ReadMe on this option and pasted the blurb on it. Well, that "visitor" turned out to be Bernie.
He told me it was him not that long ago actually, when I started posting here on PCEFX regularly.