>> 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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