R.A. Penfold About Roles Name : R.A. Penfold Book Role Computer Music Projects Author Computer & Musik Author Introduction to Computer Communications, An Author Introduction to Programming the Sinclair QL, An Author Introduction to QL Machine Code, An Author Micro Interfacing Circuits volume 1 Author MIDI Projects Author Practical Introduction to Microprocessors, A Author Introduction to Z80 Machine Code, An Author Micro Interfacing Circuits volume 2 Author Introduction to Computer Peripherals, An Author Change Request You can request changes or additions here. You can upload files. All change requests are actioned as quickly as possible and you will be informed of the result. Details Files Your Name * Email * Details Your browser doesn't have Flash, Silverlight or HTML5 support. Submit Thank you for your change request. We will respond as soon as possible.