>> I ment where you have a bank of switches to select a memory address, 
>> and a second bank of switches to select what datum to write there.
> 
> I did that at university.  We had a hex keypad to write machine code 
> instructions to RAM.  IIRC we had to write a program to do some 
> thermostat control of a heater or something - extra marks for 
> proportional control. But then this was just part of the CPU course to 
> get us familiar with instructions and stuff.

Right. So you type stuff in hex rather than raw binary, and it 
automatically advances to the next address?

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