----------------------------------<snip>--------------------------------------
I would think it means code that front-ends one of the First Level Interrupt
Handlers
That's how Amdahl implemented SE and SP assist years ago. I think IBM did it to
implement the IEEE floating point instructions so that they would work on
processors that lacked the hardware. Of course these were not malicious
implementations.
Bob Shannon
Rocket Software
------------------------------------<unsnip>------------------------------------
Even earlier than that, IBM used a comnination of hardware and software
intercepts based around Program Interrupts to implement the Commercial
Feature on the 360/44. I still have a copy of the "Emulator" that was
loaded into special areas of 360/44 core that finished the process of
implementing thie Commercial Feature, as well as a few other
instructions in the General Instruction Set. :-)
Rick
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