Understanding PSP phrases


Still learning I know some of them are common sense but would someone know a good list that says what the abbreviations mean?

OFW - Official Firmware
CFW - Custom firmware
MMS - Magic Memory Stick
ROMs - ?
.nes - Nintendo Entertainment System
.gba - Game boy Advanced
(So on and so forth)
GEN - ?
TEN - ?
TA - ?

I'd like to learn every term there is for the PSP so I'm asking for your help with this not just what's on the list though.
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