The design of an X-10 compatible appliance module is described in detail. It may be assembled as-is or customised by a competent home constructor. All functionality is supplied by a PIC16C54 micro- controller at the heart of the module. Schematic, circuit description and printed circuit board design are provided in Acrobat PDF format along with full source code for the PIC16C54. The free Acrobat reader for viewing and printing the documentation may be obtained from http://www.abobe.com x10am1.zip contains: readme.txt This file X10am1.pdf Documentation including schematic and circuit board artwork. X10rx128.asm PIC16C54 source code X10rx128.hex PIC16C54 assembled object code Philip Plunkett pplunkett@cix.co.uk