Tips & Tricks of the User Group Masters for the Sinclair ZX-81 v0335 View on archive.orgAuthor(s): Bill HarmerPages: 7Date: 1996 An earlier version (v0.335) of Bill Harmer’s tips and tricks guide for the Sinclair ZX-81, compiling useful techniques from user group newsletters. Document TagsDocumentation TS 1000 PeopleBill Harmer