One of the classes late in my undergrad program was computer engineering for comp-sci. Took us through basic combinatoric circuits, mux/demux, 7 segment display decoding, all that classic ttl stuff.
final project was a 4 bit computer with 64 bits of ram. I remember spending many hours in the lab debugging my wiring. But it was super cool to toggle in data, advance the pc, toggle in an op, advance the pc and toggle in more data. i think i demonstrated 4 + 5 - 7 * 2
For those of us that were, seeing "64-bit" and "TTL" together immediately told us it was a chip that stored 64 bits worth of data.