At 02:00 AM 11/12/1999 -0500, Ted Ashton wrote:
>Can anyone give me information on the EDIT PB instruction?  I'm assuming it
>existed on the Series II and I know that it's octal 20470 and that you
>push onto the stack the address of a "program", a destination pointer, a
>data pointer (all word addresses, I believe) and a 0 and then
>  ASSEMBLE(CON %20470)
>
>Any guidance would be greatly appreciated.  Neither the SPL manual nor the
>software pocket guide (which claims to list the series II instruction set)
>admit to such a thing existing.  I'm needing to modify the "program".

The EDIT instruction is part of the language extension instructions that
were in the classic instruction set.  If memory serves me, this instruction
is most frequently used by COBOL, generated as a part of a MOVE verb when
the datatype is being changed because of different picture clause.

According to the instruction set manual, the low-order "0" indicates that
the program location provided at S-3 is in the PB area.  The remainder of
Chapter 4 goes on to describe all the various EDIT sub-instruction op-codes
and how they function.

Chances are all these instructions were laid in the object file by the
compiler.  Instead of trying to figure-out how to patch the series of
instructions performing the edit/move, it may be much simplier to
change the source code and re-compile.

/jf
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