The KIM-1 Computer needed only a few extra buttons to enter up to more then 65.535 memory addresses and data up to 255 decimal. Others in those times of early computing tried to save money by using ROM's as little as possible. But today there is no shortage in ROM. I was thinking about a different system of entering data and addresses, there are four seven segment LED displays, above these displays are four buttons, for up, underneath there are fout buttons for down. Then all the memory addresses can be typed in with only eight buttons. For data it is the same idea, two LCD displays, two buttons above, two buttons underneath. Furthermore there are buttons needed for Go and Store etc. It won't save money or time but I think is is less work then typing in all addresses and all data binary. Another idea would be, four cursor buttons, with left and right you choose one of the seven segment LED display, and with up and down you higher or lower the number.

Hello :D