Syntactic variables – Motorola MVME166IG/D2 User Manual

Page 72

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Using the 166Bug Debugger

4-2

MVME166 Single Board Computer Installation Guide

4

The commands are shown using a modified Backus-Naur form syntax. The
metasymbols used are:

Syntactic Variables

The following syntactic variables are encountered in the command
descriptions which follow. In addition, other syntactic variables may be used
and are defined in the particular command description in which they occur.

boldface strings

A boldface string is a literal such as a command or a
program name, and is to be typed just as it appears.

italic strings

An italic string is a "syntactic variable" and is to be
replaced by one of a class of items it represents.

|

A vertical bar separating two or more items indicates that
a choice is to be made; only one of the items separated by
this symbol should be selected.

[ ]

Square brackets enclose an item that is optional. The item
may appear zero or one time.

{ }

Braces enclose an optional symbol that may occur zero or
more times.

DEL

Delimiter; either a comma or a space.

EXP

Expression (described in detail in a following section).

ADDR

Address (described in detail in a following section).

COUNT

Count; the syntax is the same as for EXP.

RANGE

A range of memory addresses which may be specified either
by ADDR DEL ADDR or by ADDR : COUNT.

TEXT

An ASCII string of up to 255 characters, delimited at each end
by the single quote mark (’).

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