NEO-CMC

"CMC42" chip on a MVS cartridge. Picture courtesy of [MVS-Scans].

Most infos from [MAME:neocrypt.c]

C and (merged) S ROM banking and decryption chips found on CHA cartridge boards, in two (?) versions:

• "CMC42": 90G06CF7042
• "CMC50": 90G06CF7050 (can also be used to decrypt M1 ROMs)

File:Brd cmcnoref.jpg

"CMC50"

Also found on ROM-only arcade boards, without the "NEO-CMC" marking.

Pinout