Motorola MVME177P, Installation And Use Manual

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177Bug Firmware
3
177Bug includes:
❏
Commands for display and modification of memory
❏
Breakpoint and tracing capabilities
❏
A powerful assembler/disassembler useful for patching programs
❏
A “self-test at power-up” feature which verifies the integrity of the
system
In addition, the TRAP #15 system calls make various 177Bug routines that
handle I/O, data conversion, and string functions available to user
programs.
177Bug consists of three parts:
❏
A command-driven user-interactive software debugger, described
in this chapter. It is referred to here as “the debugger” or “177Bug”.
❏
A command-driven diagnostic package for the MVME177P
hardware, referred to here as “the diagnostics”.
❏
A user interface or debug/diagnostics monitor that accepts
commands from the system console terminal.
When using 177Bug, you operate out of either the debugger directory or
the diagnostic directory.
❏
If you are in the debugger directory, the debugger prompt
177-Bug>
is displayed and you have all of the debugger commands at your
disposal.
❏
If you are in the diagnostic directory, the diagnostic prompt
177-
Diag>
is displayed and you have all of the diagnostic commands at
your disposal as well as all of the debugger commands.
Because 177Bug is command-driven, it performs its various operations in
response to user commands entered at the keyboard. When you enter a
command, 177Bug executes the command and the prompt reappears.
However, if you enter a command that causes execution of user target code
(for example, GO), then control may or may not return to 177Bug,
depending on the outcome of the user program.