Tronica 99: Small LED RPN Scientific, 20 keys

[Chasfield]

Re: the limited number of keys

There were several early scientifics with few keys. The first Sinclair Scientific gets by with 18. I have a Sumlock Anita 841 with 20 and a Commodore SR7919D with 19.

Commodore and Sumlock Anita specifically went for this form factor to get more use out of tooling used for four function models. I believe that Sinclair got stuck with a warehouse full of four function calculator cases when when Gillette pulled out of a manufacturing deal. These cases were used on various low spec. scientifics, and even went on to be the housing for a low cost multimeter.

Desperate times.