"Has much to commend it, and covers areas such as trigonometrical manipulations and mathematical functions."
Acorn User

"A very useful handbook for the advanced programmer and a useful guide to those who wish to find out more about their computer."
Electron User

Basic Rom User Guide
Acornsoft/Adder

Information

This book contains a detailed description of the BASIC system used on the BBC Microcomputer and Acorn Electron. It covers the operation of BBC BASIC I, BBC BASIC II and Electron BASIC, and enables the serious programmer to considerably enhance the facilities of his machine.

A number of useful examples are provided including a complete disassembler, and various facilities such as listing active variables and overlaying procedures are described.

Extensive reference sections cover the ROM routines and error recovery, including changing MODE inside procedures and salvaging bad programs.

First Sentence

Many books have been written explaining how to program in BBC BASIC, or how to program in 6502 machine code.