pdp-11 assembly standards

Brent Hilpert hilpert at cs.ubc.ca
Wed Jan 11 01:59:34 CST 2017

On 2017-Jan-10, at 5:03 AM, Noel Chiappa wrote:
>> From: Brent Hilpert
>>>>> One assembler doc uses a prefix of "&o"
>> So the answer is, by modern expectations the old standard would be
>> ambiguous or misleading.
> Well, the ideas of 'assembler' and 'standard' don't really go together in my
> mind... :-)
> But seriously, I don't know how many different PDP-11 assemblers there were,
> but the two _main_ ones (DEC's, and Unix's) both use the same numeric
> convention (although they differed in other ways, probably because of the
> CTSS/Multics erase character convention): a sequence of digits is an octal
> number, unless there's a trailing '.', in which case it's decimal.
> (Well, technically, DEC had PAL-11 and MACRO-11, but PAL-11 was basically a
> subset of MACRO-11, and used the same number syntax.)
> I've never heard of that '&o' bizzaro-stuff - where did you find that?
> 	Noel

This one:
Reading more closely, the encoding has some relation back to BBC BASIC.
I was beginning to wonder if it was some html character-encoding screwup.

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