Reminds me of the IBM 1401 where the boot card needs to not only load the next card, but place "word marks" on the read "characters". Only after a few cards wou

Reminds me of the IBM 1401 where the boot card needs to not only load the next card, but place "word marks" on the read "characters". Only after a few cards would you have bootstrapped enough to go further. Ken Shirriff did a post about it a few years ago: http://www.righto.com/2021/02/an-ibm-1401-mainframe-computer-at.html http://www.righto.com/2021/02/an-ibm-1401-mainframe-computer...