cclist at sydex.com
Tue Apr 17 13:21:51 CDT 2018
How many started coding for a machine writing machine code?
I recall that the IBM 1620 SPS coding forms had two sides--one for
coding assembly (SPS); the other labeled "IBM 1620 Absolute Coding
System". Basically a form with the first 5 positions reserved for the
address, 2 positions for the opcode and 5 positions each for the P and Q
You could enter the code from the form right into the console typewriter
or punch it on a keypunch. If you were a real hard-case, you didn't
bother with coding forms, you sat down at the typewriter and did
everything from memory, mentally keeping track of storage addresses and
what referenced them.
Do this for a while and disassembly is easy. After all, you'll have all
of the instructions and their opcodes committed to memory.
I believe that I can still do this for 8080 code, in spite of my
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