The TC514100 is a 4,194,304 word x 1-bit chip. (So it's a 4-megabit chip). Eight of them make 4 megabytes. The 60 at the end of the part number almost certainly indicates 60 ns. Looks like you're correct!

The chip in the upper-right corner is likely a PAL, probably to patch the problem that can cause 4 Mb and larger chips to go into test mode in the II and IIx (see near the end of this technote).