THE BEGINNING:
This book is designed to be an
assewbly language programming for
introduction the field of machine and
the Sinclair ZXBO and LXSI.
So let us look at the way a computer operates
PROGRAMMER
T
TV SCREEN
KEYI~JARD
OPERATING SYSTEM
CENTRAL
PROCESSING
UNIT
What this diagram shows is that there is a barrier between the programmer
and the central proccessing unit of the computer. It is not possible
under normal programming for the progra~ner to tell the central processing
unit - usually referred to as the CPU - what to do.
In the Sinclair machines the CPU is a Z~A chip， and [ am sure it comes as
no surprise to learn that the ZSOA does not understand a word of \"BASIC I
Indeed no CPU is able to be programmed in a way that is directly readable
by humns.
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