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>> 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?
Yeh something like that, I don't remember the exact details. I think you
could enter a memory address and hit the "address" button or something and
it would then accept instructions from that point, and then there was a
"run" button. Pretty basic, but armed with the instruction set datasheet
you could actually write stuff that worked. IIRC they had a few channels of
analogue and digital IO mapped to certain addresses that were connected to
useful stuff like LEDs, temperature sensors and heaters.
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