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Aucbvax.1543 fa.unix-wizards utzoo!duke!mhtsa!ucbvax!DYER@HARV-10 Sat Jun 6 09:27:33 1981 405 exec's

405 exec's have been around a while at Harvard, but only recently have been anything more than a curiosity. The maintainer of PPL, a large interpretive teaching language running on our 11/70's, finally ran out of I-space to implement a number of new features. He used 405 exec's to implement little-used functions, exec'ing back to the main 411 when they were finished.

Getting the Harvard MACRO-11 LINKR to produce such a file was a bit of a mess. Basically, one had to hand-assign the needed addresses (based on the 411 file) and adb a 405 in the front. Usually, several "nm ... vi ... macro ... linkr" iterations were necessary. However, because these functions looked at only a small part of the available data space, the job wasn't too laborious. So it works, if you take the time.

Steve

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