Long time between posts...
I'm just going to bump this, as there doesn't seem to be any other alternative, but is there a list of part numbers for the ROM chips themselves? The above link is long gone these days, and on archive.org (July 2003 link) it seemed to only be a list of the part numbers you'd find on the labels anyway like CX2601 for Combat. Yes, I know it's a pain to have to desolder the RF shielding just to read them, but here's four random carts to start with (all are in well used/poor condition with the labels already damaged so no value lost opening them). Surprisingly, not even MAME has any info when it comes to documenting the chips.
Midnight Magic (PAL version, red label, CX129)
PCB:
C011885 REV G
KALEXCK368 1088
94V-0
ATARI ©1978
The 0 in C011885 is slashed on this particular PCB, so it's most likely meant to be a zero and not the letter O.
The 0 in 1088 looks like a back-to-front C.
(the 0 is slashed so it's most likely a zero and not the letter O)
ROM chip:
C300046-129A
©ATARI 1986
RP2C12 1008
38 8B4 A0
Midnight Magic also has 129 stamped in red on the RF shield (obviously the game ID since it matches the label).
Plaque Attack (Activision, AX-027)
PCB:
©1980 ACTIVISION
AG-910-02D REV D
ROM chip:
33511 8334DPP
AG-027-21
©1978 AMD
©1983 ACTVSN
Plaque Attack didn't actually have any RF shielding. Not sure if it's a PAL release (I'm in Australia) or a US import - PAL versions of Activision games usually have the ID as EAX-xxx (E for Europe). The cartridge is dead so I can't test it (I accidentally let out the magic smoke 15 or so years ago when I was testing a faulty 2600, had the cartridge opened for cleaning, put the bare board into the console and forgot that the chip side is supposed to face the back of the console!)
Combat (PAL, picture label, CX2601)
PCB:
C010789
ATARI ©78
M
ROM chip:
9316B-7A13
C012501A
8217 CEA
© 1978ATARI
Asteroids (PAL, picture label, CX2649)
PCB:
C011885 REV F
ATARI © 1978
ROM chip:
8151
C49005
C017449A-03
©ATARI1981
RF shield also has 449 printed on it twice as well as E-B stamped into the metal.