Stuffing routines in 4KB or 8KB memory was not unique nor state-of-the-art but daily business then. Been there, done that,
got the
t-shirt.
By then? I seriously doubt both your statements.
Why? IIRC CP/M loads in about 8KB of RAM (for the youngsters, CP/M was
an operating system for 8080 and Z80 based computers).
Somewhere around here I have a program I wrote to run under CP/M that calculates the date of Easter for any year since (I think) 1583 - the
calendar was radically changed in that year. I haven't looked at it
since probably 1980 but I think it loads in 2KB of RAM
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