Acorn Computers Limited BBC A, Hardware Manual, Page: 10 / 47

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To complement the impressive graphics features of the BBC Microcomputer the model B machine is fitted
with a primary colour drive RGB output. This can be used to connect the machine directly to primary
colour drive monitors. The display produced on good quality RGB monitors is far superior to that
produced by connecting the machine to a domestic television receiver.
Figure 1.1 is an overview of the BBC Microcomputer system showing the numerous expansions that can
be added to the machine. It can clearly be seen from this diagram that the machine is capable of being
considerably expanded.
The authors of this book have endeavoured to cover all of the hardware aspects of the machine in the
hope of assisting people to understand the inner workings of what otherwise might be considered as a
“magic black box" (cream box ?). It has been our aim throughout the book to simplify, wherever possible,
the descriptions and explanations of the internal circuitry of the machine. In some instances it has been
extremely difficult to describe in simple terms what is in fact a very complex process and the casual
reader may, therefore, find certain sections difficult to understand. The manufacturers data sheets
included in appendix 1 may be of help in such instances.
Wise Owl Publications have produced a further book on the hardware aspects of the BBC
Microcomputer. This book contains a full set of manufacturers data sheets on all of the TTL 7400 and
CMOS 4000 series devices used in the machine together with data sheets on all of the devices that are
not given in appendix 1. In addition to this book Wise Owl also produce a range of hardware "add-ons" for
the BBC Microcomputer including digital-to-analogue converters and an automatic stop/start scroller
called the "Owl-Scroll". For details on any of the above items send an S.A.E. to:
Wise-Owl
Hull Innovation Centre,
Guildhall Road,
Queens Gardens,
Hull.
HUl 1HJ.