1. /aws/ (East Coast), /ay-os/ (West Coast) A
PDP-10 instruction that took any memory location and add
ed 1 to it. AOS meant "Add One and do not Skip". Why, you may ask, does the "S" stand for "do not Skip" rather than for "Skip"? Ah, here was a belov
ed piece of PDP-10 folklore. There were eight such instructions: AOSE add
ed 1 and then skipp
ed the next instruction if the result was Equal to zero AOSG add
ed 1 and then skipp
ed if the result was Greater than 0 AOSN add
ed 1 and then skipp
ed if the result was Not 0 AOSA add
ed 1 and then skipp
ed Always and so on. Just plain AOS didn' t say when to skip, so it never skipp
ed. For similar reasons, AOJ meant "Add One and do not Jump". Even more bizarre, SKIP meant "do not SKIP"! If you want
ed to skip the next instruction, you had to say "SKIPA". Likewise, JUMP meant "do not JUMP" the unconditional form was JUMPA. However, hackers never did this. By some quirk of the 10' s design, the
JRST (Jump and ReSTore flag with no flag specifi
ed) was actually faster and so was invariably us
ed. Such were the perverse mysteries of assembler programming. 2. /A-O-S/ or /A-os/ A
Multics-deriv
ed operating system support
ed at one time by
Data General. A spoof of the standard AOS system chefistrator' s manual ("How to Load and Generate your AOS System") was creat
ed, issu
ed a part number, and circulat
ed as photocopy folklore it was call
ed "How to Goad and Levitate your CHAOS System". 3. Algebraic Operating System, in reference to those calculators which use
infix operators instead of {postfix notation}. [
Jargon File] (1995-11-26)
In addition suitable contents:
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