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Booting the IBM 1401: How a 1959 punch-card computer loads a program

righto.com/2021/02/an-ibm-1401

No operating system? No ROM? No problem!

@djsundog The DEC PDP 8/L (1971) had rows of switches and a printed card on the front with rows in binary. You had to set the switches for each row and press another switch to enter that row into memory.

When you were done, it would load the rest of the system from the punched-tape reader (if you had the correct tape in place).

Looks like the IBM was more advanced -- it knew how to load stuff without being programmed first!

@woozle and you, too, can have that power at your fingertips for a mere $2500/month lease!

@djsundog P.S. When I say "printed", I think I actually mean "hand-written in pen", but my memories are vague.

It might have been done with a typewriter.

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