INDRAMAT DDS2.1-W100-D Output expansion module

Description of 187Bug The 187Bug package is a powerful evaluation and debugging tool for systems built around the MVME187 RISC-based microcomputers. 187Bug consists of three parts: 

❏ The “debugger” or “187Bug“; a command-driven userinteractive software debugger, described in Chapter 5

❏ A command-driven diagnostic package for the MVME187 hardware

❏ A user interface which accepts commands from the system console terminal

Various 187Bug routines that handle I/O, data conversion, and string functions are available to user programs through the TRAP #496 handler. The TRAP #496 handler is accessible through any of the trap exception commands TB0, TB1, TBND, and TCND, with trap vector #496.

Command Facilities

 Facilities are available for loading and executing user programs under complete operator control for system evaluation. 187Bug includes commands for these tasks: 

❏ Display and modification of memory 

❏ Breakpoint and tracing capabilities 

❏ A powerful assembler/disassembler useful for patching programs 

❏ A self-test at powerup feature which verifies the integrity of the system

Debugger or Diagnostic Directories 

When using 187Bug, you operate out of either the debugger directory or the diagnostic directory.You may switch between directories by using the Switch Directories (SD) command. You may examine the commands in the current directory by using the Help (HE) command.

Because 187Bug is command-driven, it performs its various operations in response to user commands entered at the keyboard. When you enter a command, 187Bug executes the command and the prompt reappears. However, if you enter a command that causes execution of user target code (e.g., "GO"), then control may or may not return to 187Bug, depending on the outcome of the user program.

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