So far as I know the chips used in the Apple IIe/c and Mac 128k are completely bog-standard 4164s so you shouldn't really need a cross-reference table; IE, searching for "4164 DRAM" should net you a compatible 64kbitx1 part, the only thing that should matter beyond that is the speed rating. A 4164-15 has 150ns access time, while a -12 is 120, etc. As long as the part you pick is as fast or faster (IE, the -number is the same or smaller) it should work. Perhaps people that have repaired these systems have experienced (reproducible?) incompatibility issues with particular vendors but they're supposed to be a standard part.
(Note that for some of the oddball part numbers that don't include "4164" it's still usually not that hard to find a replacement; the better/more knowledgeable vendors online are pretty good at putting together compatibility matrices.)
The same chips were used in practically every "64k" home computer made in the early-mid-80s. Some late models, like the last Commodore 64s, Tandy CoCo2s, and the Apple IIc Plus, switched to the 4464 (also confusingly called the 41464), which is a 256kbit, 64kx4 part. There's little danger of confusing the two because the 4464 has 18 pins to the 4164's 16. These parts are the same density as the 41256 256kx1 chips used in many mid-80s 16 bit computers (like most PC clones with 512k or more of RAM, Amigas, Atari STs, and, yes, the Fat Mac) but likewise have a different pinout, as the 41256 also has 16 pins. (According to the C64 Wiki
if you're really desperate you can sub a 41256 for a 4164 by adding a jumper wire.) In any case, 4164s are still readily available.
Even Jameco still has them for 99 cents each. The chips that are *starting* to get hard to find are the 4116 16k chips that were used in the Apple II plus and earlier.
That said, Jameco claims to have those too. (And it's also possible to sub a 4164, although the result looks sort of ugly unless you modify the motherboard instead of using jumper wires. One of my PETs has the 4116s replaced with 4164s. The best reason for doing this is to reduce load on the power supply; the 5+ volt only silicon process used in the 4164s is a considerable improvement over the triple-voltage 4116 and the chips draw less than 1/4th the total current. And that's discounting the loss in the regulators.)
Again, these are *very standard* parts, made in the millions. About the only semi-common 80's DRAM chip I've glossed over is the 16kx4 equivalent of the 4464, the 4(1)416. You might run across those in the last 16k/32k computers that made it out the door. There's also a semi-rare 16kx1 RAM variant, the
4516, that's mostly the same as the 4116 but only uses a single 5v supply. (Which also makes it essentially a 16k version of a 4164) I don't know of any Apple product that uses either of these chips.
(Well, okay, by the later 80's there were also the 1Mb dense chips like the 44256 and its 1Mbx1 counterpart, but I think Apple had pretty much stopped using DIP-package RAM in computers by the time these became common so they seem a little off-topic for this thread. You will find those in PC-ATs, etc, and possibly some Apple IIe/GS memory cards.)
