The Sinclair Scientific

 

	Introduced in 1974. Simple low cost 12 function RPN calculator. It displays only in scientific notation, with a five digit mantissa and a two digit exponent. This nice calculator was also available as a build-it-yourself kit.

Manuals

A pdf version of the operating instructions can be downloaded here.
This calculator was also available as a build-it-yourself kit. The assembly instructions can de downloaded here.

My sinclair scientific inside page shows the interior of this calculator.

Sinclair Scientific related links:

• Wikipedia
• Reversing Sinclair's amazing 1974 hack by Ken Shirriff

Sinclair related links:

• Kit review Sinclair Cambridge Scientific. Article by John Boxall
• Kit review Sinclair Cambridge Scientific. Photo's by John Boxall