KEBA HT401-22240 Remote I/O module

Pressing and releasing the MVME177 front panel RESET switch initiates a system reset. COLD and WARM reset modes are available. By default, 177Bug is in COLD mode. During COLD reset, a total system initialization occurs, as if the MVME177 had just been powered up. In other words, during a COLD reset: ❏ All static variables (including disk device and controller parameters) restore to their default states 

❏ The breakpoint table and offset registers are cleared 

❏ The target registers are invalidated 

❏ Input and output character queues are cleared

❏ Onboard devices (timer, serial ports, etc.) are reset 

❏ The first two serial ports are reconfigured to their default state

You can initiate an abort by pressing 

 releasing the ABORT switch on the MVME177 front panel. If an abort is initiated while executing a user program (running target code), a “snapshot” of the processor state is captured and stored in the target registers. For this reason, abort is most appropriate when terminating a user program that is being debugged. Abort should be used to regain control if the program gets caught in a loop, etc. The target PC and register contents assist you in locating the malfunction.Pressing and releasing the ABORT switch generates a local board condition that causes: 

❏ A processor interrupt (if enabled) 

❏ The target registers (reflecting the machine state at the time the ABORT switch was pressed) display on the screen 

❏ All breakpoints installed in your code are removed 

❏ Breakpoint table remains intact

Break 

You can generate a “Break” by pressing and releasing the BREAK key on the terminal keyboard. Break does not generate an interrupt. The only time break is recognized is when characters are sent or received by the console port. A Break causes: ❏ All breakpoints in your code to be removed ❏ Breakpoint table to be maintained intact ❏ A snapshot to be taken of the machine state if the function was entered using SYSCALL ❏ The snapshot is accessible to you for diagnostic purposes Often it is desirable 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 immediately

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