About Publisher Name : Sigma Technical Press (UK) Folded : No Distribution : Unknown Updated On : April 24, 2017 Books Build Your Own Expert System Byteing Deeper into Your ZX81 Complete FORTH, The Computer Programs That Work! Fifty Subroutines for the Sinclair Spectrum Sinclair QL User Guide Sinclair Spectrum and ZX81 Add-ons Sinclair Spectrum in Focus, The Original Releases Software Publisher Type Year Primes by Div Sigma Technical Press Utility: Maths/Science Spectrum Graphics LOGO Sigma Technical Press Programming: General 1984 Files Change Request You can request changes or additions here. You can upload files. All change requests are actioned as quickly as possible and you will be informed of the result. Details Files Your Name * Email * Details Your browser doesn't have Flash, Silverlight or HTML5 support. Submit Thank you for your change request. We will respond as soon as possible.