The IBM 701(detreville.substack.com)
detreville.substack.com
The IBM 701
https://detreville.substack.com/p/the-ibm-701
3 comments
The "accounting gimmick" that footnote 7 refers to is the use of the sign bit to add an extra instruction in a specific case, giving a total of 33 instructions.
https://www.cambridgescholars.com/resources/pdfs/978-1-5275-..., table 1-2 explains it.
https://github.com/simh/simh
Richard Cornwell has implemented the IBM 701, IBM 704, IBM 7010/1410, IBM 7070/7074, IBM 7080/702/705/7053 and IBM 7090/7094/709/704 simulators.
Richard Cornwell has implemented the IBM 701, IBM 704, IBM 7010/1410, IBM 7070/7074, IBM 7080/702/705/7053 and IBM 7090/7094/709/704 simulators.
An excellent glimpse into the very early computing market. I appreciated the debunking of the whole "five computers is all the world will need" quote along with the information about the market being split by binary and decimal computers.