Within The BBC Microcomputer holds pages of numbers and addresses, and a treasure of information for the curious trying to find what makes the BBC micro tick. This book describes all the major software systems by referencing the main subroutine entry voint addresses. And unlike recent Basic reference books that have appeared, Roger Cullis not only goes into more detail, but covers a wider range of software too. You will find comprehensive descriptions of these systems: OS 1.2, Basic I, Basic II, HiBasic, DFS 0.9, NFS 3.34, 6502 Second Processor OS, Tube Communications Routines.

The layout of each system description is similar. Following a general memory map, zero page usage, and summary, the gazetteer details four to eight hundred routine entry points. For example, the OS 1.2 sections shows you the start of every *FX and OSBYTE call, or even where the cassette filing system generates a 9.2 second interblock gap.

Although this book is printed on unusually thick, rough paper held together in the standard spiral bound format, do not judge it by its proverbial cover. Buy it!