> "Hans Franke" <franke_at_sbs.de> wrote:
>> Yes, but as a rule, mainframes and most minis catch undefined
>> opcodes in a special exeption.
> That's only a 'rule' for recent machines. Most of the early ones didn't.
> When IBM was developing the 1401 emulation for the 360/30, they discovered
> that many customers were in fact using and dependent on undefined behaviors
> of the 1401. They had to emulate a lot of things that were never documented.
Now, thats what I call early.
Of course you are right. I did only think back to the 60's
technologie (/360 is the earlyest Mainframe system I ever
programmed).
> References:
> _The Mythical Man Month_ by Brooks,
> _Computer Architecture: Concepts and Evolution_ by Brooks and Blaauw,
> _IBM's 360 and Early 370 Systems_ by Pugh, Johnson, and Palmer
Thank you
Hans
--
Ich denke, also bin ich, also gut
HRK
Received on Mon Oct 12 1998 - 05:35:38 BST