Interesting, like the INTELLEC 4 and the A1 Supply games it uses a 4289 to provide a more conventional ROM/I/O interface (as well as the pair of 4002 chips for scratchpad). In that configuration it uses conventional 8-bit ROMs for program storage, so no need to worry about dumping 4-bit devices. Just remember that it's PMOS so Vdd is negative. (The 4004/4040 always have 8-bit wide program ROM data, they just transfer it one nybble at a time. Using a 4008/4009 pair or a 4289 to do address latching and lane select, you can use conventional 8-bit ROMs instead of the dedicated 4001 chips that handle this stuff themselves.) It will be interesting to see if this thing actually uses any 4040 features.