J.W. Penfold About Roles Name : J.W. Penfold Book Role Counting on QL Abacus Author Getting the Most from Your Printer Author Into the QL Archive Author Introduction to Programming the Sinclair QL, An Author Introduction to QL Machine Code, An Author Introduction to Z80 Machine Code, An Author LOGO for Beginners Author Introduction to Computer Peripherals, An 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.