An Introduction to Programming the Acorn Electron by Penfold Book

Atari 400 800; Invitation to Programming 3: Introduction to Sound and Graphics C

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

Python for Kids : A Playful Introduction to Programming by Jason R. Briggs...

Single IC Projects by R.A. Penfold

Python for Kids: A Playful Introduction To Programming by Briggs, Jason R.

Graphics & Animation ATARI 800, 400, 1200XL, 800XL, and 600XL -C Lampton BOOK

An Introduction to Pic Microcontrollers by r-a-penfold