RELIANCE 45C224 Thermal resistance module

During warm resets, the 172Bug variables and tables are preserved, as well as the target state registers and breakpoints. Note that when the MVME172LX comes up in a cold reset, 172Bug runs in Board mode. Using the Environment (ENV) or MENU commands can make 172Bug run in System mode. Refer to Chapter 3 for specifics.You will need to reset your system if the processor ever halts, or if the 172Bug environment is ever lost (vector table is destroyed, stack corrupted, etc.).

Aborts are invoked by pressing

 releasing the ABORT switch on the MVME172LX front panel. When you invoke an abort while executing a user program (running target code), a snapshot of the processor state is stored in the target registers. This characteristic makes aborts most appropriate for terminating user programs that are being debugged. If a program gets caught in a loop, for instance, aborts should be used to regain control. The target PC, register contents, etc., help to pinpoint the malfunction. Pressing and releasing the ABORT switch generates a local board condition which may interrupt the processor if enabled. The target registers, reflecting the machine state at the time the ABORT switch was pressed, are displayed on the screen. Any breakpoints installed in your code are removed and the breakpoint table remains intact. Control is returned to the debugger.

Pressing and releasing thekey 

on the terminal keyboard generates a "power break". Breaks do not produce interrupts. The only time that breaks are recognized is while characters are being sent or received by the console port. A break removes any breakpoints in your code and keeps the breakpoint table intact. If the function was entered using SYSCALL, Break also takes a snapshot of the machine state. This machine state is then accessible to you for diagnostic purposes. In many cases, you may wish to terminate a debugger command prior to its completion (for example, during the display of a large block of memory). Break allows you to terminate the command. 

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