Mark Harrison About Roles Name : Mark Harrison Book Role Byteing Deeper into Your ZX81 Author Byteing Deeper Into Your Timex Sinclair 1000 Author Imparate il Basic con lo ZX81 Author Sinclair Spectrum in Focus, The Author Imparate il Basic con lo Spectrum Author Travesuras con el ZX81 Author 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.