J. Bobker About Roles Name : J. Bobker Software Role Publisher Type Year Listfile (Unknown) ZX-Guaranteed Utility: Database/Filing 1983 Learn Machine Code (Unknown) ZX-Guaranteed Programming: Assembler/Mcode 1987 Mind Boggler (Unknown) ZX-Guaranteed Puzzle 1983 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.