Sinclair

Sinclair calculators and home computers from the collection.

The collection follows Sinclair from an early programmable calculator through the ZX81, Spectrum and QL.

Detailed entries

1975

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

An early programmable calculator whose nine-digit display, two-level stack and programming model imposed severe limitations.

1981

A highly cost-reduced successor to the ZX80 whose low price helped start the home-computer revolution.

1982

A very popular home computer with a large software base and several later variations.

1984

An early 16-bit-ish home computer whose production problems, Microdrives and 68008 processor limited its success.