Not sure I like C= and CUSA in the same reference, since the original chicken-head company has a little more space in the hearts of men.
PCMCIA - People Can't Memorize Computer Industry Acronyms
P5 - Phase5
WTF - what the f-
SDK - software development kit
x64 - 64-bit instruction set (x86 "extension")
SMB - Server Message Block (Window Networking)
I always thought UAE was the Ubiquitous Amiga Emulator.
Since there are several old-school NNTP/IRC/chat acros in the list, I'll add a couple more:
STFU - shut the f- up
GTFO - get the f- out
FTFU - fixed that for you (I've seen it a few times as FT4U)
FML - f- my life
FTW - for the win
FTFW - for the f-ing win
(or just #include various Internet slang dictionaries)
A couple of Commodore related ones (IIRC):
VIC - Video Interface Chip (or Controller)
SID - Sound Interface Device
Last but not least, a few Amiga-related ones:
SD - scan doubler
SD/FF - scan doubler/flicker fixer
RKM - ROM Kernel Manual
NDK - Native Development Kit