| The aim of this volume is to provide both the beginner and the experienced computer user with a ready source of reference on a number of useful, interesting or entertaining machine code routines for the ZX Spectrum. To this end the book is divided into two sections. The Section A describes the features of the Spectrum which are of interest to the machine code programmer—what is meant by a machine code routine, the important internal features and routines of the Spectrum and the structure of the machine language itself.
The Section B presents the routines themselves. They are laid out in a standard format which is explained in detail at the beginning of the section. The routines are complete in themselves so that they can be loaded individually without reference to any other routines.
It is not necessary to understand how a routine works in order to use it because each routine can be loaded using the simple M/C Loader listed at the beginning of Section B. Hence if you are really impatient to use, say the List Variables routine simply turn to the relevant page, enter and RUN the M/C Loader and enter the decimal numbers listed in the column headed "Numbers to be entered". When all the numbers are loaded compare the value of the Check sum PRINTed by the M/C Loader with the value given with the routine. If they are the same you can be sure that the numbers have been entered correctly (unless you have made two or more errors which cancel out exactly). The routine is now ready for you to use. |
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| | | | Business Law: The Ethical, Global, and E-Commerce Environment
This is the 17th UCC Edition (and the twenty-second overall edition) of a business law text that first appeared in 1935. Throughout its 80 years of existence, this book has been a leader and an innovator in the fields of business law and the legal environment of business. One reason for the book’s success is its clear and comprehensive... |
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