Servicing Personal Computers, 3rd Edition

Conventions used in this book

In order to avoid confusion, particularly as far as the newcomer is concerned, the following

conventions have been adopted.

1.

Hexadecimal quantities. Where decimal and hexadecimal numbers are used concurrently

an H has been added. For example, 10 is a decimal number while 10H is a hexadecimal

number (equivalent to decimal 16). (Note that some texts use $ to precede a hexadecimal

quantity. Thus $FFFF is the same as FFFFH.)

2. Block schematics and simplified circuits. Arrows have been included to indicate the

direction of signal flow or data transfer. A solid arrow indicates a bus (multiple signal or data

line)