supported at one time by Data General. This was pronounced
/A-O-S/ or /A-os/. A spoof of the standard AOS system
administrator's manual ("How to Load and Generate your AOS
System") was created, issued a part number, and circulated as
photocopy folklore; it was called "How to Goad and Levitate
your CHAOS System". 3. /n./ Algebraic Operating System, in
reference
to those calculators which use infix instead of postfix (reverse
Polish) notation. 4. A {BSD}-like operating system for the IBM
RT.

Historical note: AOS in sense 1 was the name of a {PDP-10}
instruction that took any memory location in the computer and added
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 beloved piece of PDP-10 folklore. There were eight such
instructions: AOSE added 1 and then skipped the next instruction
if the result was Equal to zero; AOSG added 1 and then skipped if
the result was Greater than 0; AOSN added 1 and then skipped
if the result was Not 0; AOSA added 1 and then skipped Always;
and so on. Just plain AOS didn't say when to skip, so it never
skipped.

For similar reasons, AOJ meant `Add One and do not Jump'. Even
more bizarre, SKIP meant `do not SKIP'! If you wanted 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 specified) was actually faster
and so was invariably used. Such were the perverse mysteries of