The Unreal® 1401 datacenter simulator

[EdS]

Transcribing Ken Shirriff’s hand-toggled primes program onto (virtual) punch cards, and loading and running them on the 3D simulation:

software theft 60s' style (primes) - IBM 1401 programming - R8

More like this on the same channel: rolffson‘s IBM 1401 channel

Parent page here. Via dragonfly digest.

Previously:

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

Interesting details. By Ken Shirriff. How do you boot a computer from punch cards when the computer has no operating system and no ROM? To make things worse, this computer requires special metadata called “word marks” that can’t be represented on a card. In this blog post, I describe the interesting hardware and software techniques used in the vintage IBM 1401 computer to load software from a deck of punch cards. (Among other things, half of each card contains loader code that runs as each c…