An Introduction To Programming The Atari 600/800 XL By Penfold

An Introduction to PIC Microcontrollers (BP) by Penfold, R. A. Paperback Book

A Concise Introduction to Unix (BP) by Kantaris, Noel 0859342042 The Fast Free

Easy PC Troubleshooting (BP) By R. A. Penfold

A Concise Introduction to WordPerfect 5.2 for Windows By Phil Ol

Build Your Own PC (BP) By R. A. Penfold

Easy PC Upgrading (BP) By R. A. Penfold

Single IC Projects by R.A. Penfold