Sinclair ยท 1975
Scientific Programmable Calculator
A basic programmable scientific calculator with reverse Polish entry.
- Released
- 1975
- Power
- 9-volt alkaline battery or mains adaptor
- Display
- Nine-digit, seven-segment green vacuum fluorescent display
- Precision
- Five digits
- Entry
- Reverse Polish notation
- Functions
- Sine, cosine, arctangent, antilog, log, reciprocal, square and square root
This is a very basic programmable calculator with many shortcomings. Although it has a nine-digit display, its precision is limited to five digits because three are reserved for the exponent. There is no power function. Reverse Polish entry is limited by a two-level stack, which is destroyed whenever a scientific function is used.
The programming model is wasteful: constants, for example, require opening and closing quotes, and constants in programs must be integers.