Ans before minus problem [Beginner Alert]

[Steve Simpkin]

(03-25-2020 10:24 PM)Wes Loewer Wrote:  

(03-25-2020 02:33 AM)Steve Simpkin Wrote:  HP used 'CHS' (Change Sign) for many years.

On the Friden 132 from the mid 60's, the key was labeled "CHANGE SIGN".

Interesting. On the first (HP9100A) and second (HP9810A) generation HP desktops they labeled it "CHG SIGN".
https://www.hpmuseum.org/9100/9100akm.jpg
https://www.hpmuseum.org/98xx/9810kbds.jpg

On the third generation (HP9815A) HP desktop they changed it to a "+ -" symbol with a pair of curved arrows between them.
https://www.hpmuseum.org/9805_15/9815keyl.jpg

When they came out with the HP-35 hand held, they changed it to "CHS". "CHS" was then used on hand helds and desktop models until the HP-48SX.