Introduction The Miles Gordon Technology DISCiPLE gives the Sinclair ZX Spectrum access to diskdrives, printers, joysticks and a network. An Operating System of almost 16K is added to the Spectrum "main" ROM to control, from BASIC or machine code, the new functions. This book lists and explains all the code belonging to 'System 3d'. When I upgraded my Spectrum by buying the DISCiPLE, it never came to my mind that it would be me who had to deal with 'The Complete DISCiPLE Disassembly'. I hope the reader finds it useful and wish him or her success in discovering the programming "secrets" of the DISCiPLE. Met dank aan: J.H. Arends C.M. Ballintijn R.L. Koning J.A.L. Stap Sinclair Gebruikersgroep Groningen Assen, October 1993 J.R. Biesma The Netherlands rudy@biehold.nl