Drawing on the Past at Captivate

Drawing on the Past at Captivate

Recently I exhibited our organization for the inaugural Captivate! Conference in Austin, Texas. My experiences underscored some of the most rewarding and the most challenging aspects of preserving computer culture.

October 9, 2013 0 comments Read More
How I coded in 1985

How I coded in 1985

Phenomenal article by John Graham-Cumming. Major respect for his patience! Original: How I coded in 1985

May 7, 2013 1 comment Read More
Two-tonne Witch computer gets a reboot

Two-tonne Witch computer gets a reboot

Wow! The oldest working digital computer came to life again recently in the UK. What a fascinating machine.   Original: “Two-tonne Witch computer gets a reboot” (BBC News)

November 26, 2012 0 comments Read More
Curious ROM Variant on Apollo Lunar Module

Curious ROM Variant on Apollo Lunar Module

I’ve recently been reading the Operations Handbook for the Apollo Lunar Module (don’t ask), and in it I learned of a read-only memory variant that I was hitherto unaware of. The Apollo Lunar Module (LM) carried two on-board computers:  one in the Primary Guidance & Navigation System, called the LM […]

October 17, 2012 0 comments Read More
Jacquard Looms and Rod ROMs

Jacquard Looms and Rod ROMs

As I described in Dimond Rings and Read-Only Ropes, both of the methods for constructing rope read-only memories had their problems. Those using magnetic toroids for the bit transformers were reliable, but labor intensive to string, and the inevitable stringing errors frequently required extensive rework to correct. Each time the contents were altered also required another test cycle, which led to manufacturing delays and added to the costs.

October 14, 2012 2 comments Read More