Way to read CMOS 4-bit computer?
I dug up a full copy of the datasheet (not just the first page), and I don't see a way. It's a mask ROM, so the ROM data is hard-wired in the chip during manufacturing. Unless the program itself provides a way to dump the memory, you're probably out of luck. If you can attach a logic analyzer to the pins, you can at least see what it's doing to the rest of the system.