Comment by jonjacky

A detailed description of the Programma 101 architecture and internals appears as Chapter 19 in the book Computer Structures: Readings & Examples edited by Gordon Bell and Alan Newell, 1971.

Bell and Newell write, "The Programma 101 (Chap. 19) is at the limit of what we call a stored program computer. It has a sufficient instruction set to be classified as a computer, but the storage for temporary data, constants, and programs is limited. ..." (from the beginning of Section 4 in the book, linked at Bell's web site, URL below)

Here is the HTML verson from Gordon Bell's website:

https://gordonbell.azurewebsites.net/Computer_Structures__Re...

Here are scans of the original book pages from a computer history site:

https://tcm.computerhistory.org/ComputerTimeline/Chap19_oliv...