PROSOFT MVI56-MDA4 gas analyzer main module

PROSOFT MVI56-MDA4 gas analyzer main module

Technical data of product parameters

Abort is invoked by pressing and releasing theMVI56-MDA4 switch on the
MVME147 front panel. Whenever Abort is invoked when executing
a user program (running target code), a “snapshot” of the processor
state is captured and stored in the target registers. (When working
in the debugger, Abort captures and stores only the program
counter, status register, and format/vector information.) For this
reason, Abort is most appropriate when terminating a user MVI56-MDA4
program that is being debugged. Abort should be used to regain
control if the program gets caught in a loop, etc. The target PC, stack
pointers, etc., help to pinpoint the malfunction.
Abort generates a level seven interrupt (non-maskable). The target
registers, reflecting the machine state at the time the ABORT switch
was pushed, are displayed to the screen. Any breakpoints installed
in your code are removed and the breakpoint table remains intact.
Control is returned to the debugger.A Break is generated by pressing and releasing the BREAK key on the MVI56-MDA4
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. Break removes any breakpoints in your code and
keeps the breakpoint table intact. Break does not, however, take a
snapshot of the machine state nor does it display the target registers. Many times it may be 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
without overwriting the contents of the target registers, as would be
done if Abort were used. The program portion of 147Bug is approximately 256KB of code
and consists of the debugger and diagnostic packages. It is
contained entirely in EPROM. The EPROM sockets on the
MVME147 are mapped starting at location $FF800000. However,
the 147Bug code is position-independent and executes anywhere in
memory. SCSI firmware code is not position-independent.

Product picture display

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