22-10-2023, 04:10 PM
(This post was last modified: 22-10-2023, 04:13 PM by peter scott.)
Thanks Gary,
I've driven a lot in Europe and North America but mainly in LHD cars. When previously I've used my RHD car on the wrong side the main trick is never to park on the wrong side of the road because it's very tempting to drive off UK style. Other than that the brain appears to switch sides without much thought.
The HP 9100A was introduced in 1968 and has a core memory that can take up to 196 key presses or register operations and of course it remembers them if you switch off. It also has a magnetic card reader that you can store programs on. One nice thing in the service manual is a program that exercises every subroutine in the machine and shows a very simple 1,2,3 display if all tests passed. I did make a little video to show to Jac.
https://youtu.be/HaK7WuSUTxs
I worked as an R&D engineer at Hewlett-Packard for 32 years although not in the computing side of the company but when I first joined I was one of 90 engineers in an open plan lab and apart from our slide rules the only computing devices in the lab were an HP2100 the size of a fridge and an HP9100A that sat on a trolley with a flag-pole attached so that you could spot where it was.
Five years after the 9100A came out HP produced the 65 handheld that had almost the same functionality including the magnetic card.
![[Image: hewlett-packard-hp-65-1974_9vzr.jpg]](https://sm.pcmag.com/pcmag_uk/photo/h/hewlett-pa/hewlett-packard-hp-65-1974_9vzr.jpg)
More on the HP 9100A: https://www.hpmemoryproject.org/timeline...968-09.pdf
I've driven a lot in Europe and North America but mainly in LHD cars. When previously I've used my RHD car on the wrong side the main trick is never to park on the wrong side of the road because it's very tempting to drive off UK style. Other than that the brain appears to switch sides without much thought.
The HP 9100A was introduced in 1968 and has a core memory that can take up to 196 key presses or register operations and of course it remembers them if you switch off. It also has a magnetic card reader that you can store programs on. One nice thing in the service manual is a program that exercises every subroutine in the machine and shows a very simple 1,2,3 display if all tests passed. I did make a little video to show to Jac.
https://youtu.be/HaK7WuSUTxs
I worked as an R&D engineer at Hewlett-Packard for 32 years although not in the computing side of the company but when I first joined I was one of 90 engineers in an open plan lab and apart from our slide rules the only computing devices in the lab were an HP2100 the size of a fridge and an HP9100A that sat on a trolley with a flag-pole attached so that you could spot where it was.
Five years after the 9100A came out HP produced the 65 handheld that had almost the same functionality including the magnetic card.
More on the HP 9100A: https://www.hpmemoryproject.org/timeline...968-09.pdf
