Hewlett Packard HP-28S calculator

Tags:   calculator Hewlett Packard 28S HP

© All Rights Reserved

A collage of rare Hewlett Packard Champion/ Clamshell series calculators.
Top left: 18C custom keys, top right: clear cased 19Bii (with unique information label above the alpha keyboard)
bottom left: 28S 100th anniversary edition, bottom right: clear cased 28S.
The only production version shown here is the American Mathematics 100th anniversary edition - released in limited numbers in 1988.

Tags:   HP Hewlett Packard 28S 19Bii 18C 100th anniversary calculator clamshell

© All Rights Reserved

Hewlett Packard HP28S Advanced Scientific Calculator. Very advanced in it's day (in fact more advanced than many high end scientifics that you can buy today). The 28S was my first HP at University, so they are a favourite in my collection (I have about 7 in my collection - some rare).

Tags:   Hewlett Packard HP 28S calculator

© All Rights Reserved

This is a very rare clear cased Hewlett Packard 28S calculator. The is one of the gems of my collection - more because the 28S was my first HP when I was at Uni.

Tags:   calculator Hewlett Packard HP 28S rare clear-case

© All Rights Reserved

This is actually a 28S running a program I wrote that continuously wraps the screen and XOR's it, making a lot of noise that repeats itself in patterns. I've placed a clear shell above it with some spare keys "KEITH:" on the top row - the other keys you can see are the working 28S below the shell.

Tags:   Hewlett Packard HP 28S

© All Rights Reserved