Using CP/M
Programming in Z80 Assembly Language
MS-DOS and PC-DOS: A Practical Guide (Computer Science Series)
Advanced Programming for the 16K ZX81
The Sinclair ZX81 Programming for Real Applications
Z80 Assembly Language Programming for Students
The Complete Disk Manual for the BBC Microcomputer
Programmierleitfaden IBM ROM BIOS
An Introduction to System Programming - Based on the PDP 11
Operating the BBC Microcomputer A Concise Guide
