16XBug is a powerful evaluation and debugging tool for systems built around the MVME16X CISC-based single-board computer and embedded controller modules. Facilities are available for loading and executing user programs under complete operator control for system evaluation. 16XBug includes commands for display and modification of memory, breakpoint and tracing capabilities, a powerful assembler/disassembler useful for patching programs, and a selftest at power-up feature which verifies the integrity of the system. Various 16XBug routines that handle I/O, data conversion, and string functions are available to user programs through the TRAP #15 system calls. Note 167Bug is used in most examples of commands and displays given in this manual. However, the commands and displays apply to all 68K CISC debugging packages, unless otherwise noted.
Overview of M68000 Firmware
The firmware packages for the M68000-based (68K) series of boards and systems have a common genealogy. They achieve good portability and comprehensibility by being written entirely in the "C" programming language, except where forced to utilize assembler functions.16XBug consists of three parts: 1. A command-driven user-interactive software debugger, described in Chapter 2 and hereafter referred to as "the debugger" or "16XBug". 2. A command-driven diagnostic package for the specific CPU board hardware, described in a separate board-specific debugger manual and hereafter referred to as "the diagnostics". 3. A user interface that accepts commands from the system console terminal.
When using 16XBug
you will operate out of either the debugger directory or the diagnostic directory. ❏ If you are in the debugger directory, the debugger prompt "16X-Bug>" is displayed and you have all of the debugger commands at your disposal. ❏ If you are in the diagnostic directory, the diagnostic prompt "16X-Diag>" is displayed and you have all of the diagnostic commands at your disposal as well as all of the debugger commands. You may switch between directories by using the Switch Directories (SD) command (refer to Chapter 3), or may examine the commands in the particular directory that you are currently in by using the Help (HE) command
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