10 Jan
2017
10 Jan
'17
11:54 p.m.
On 2017-Jan-10, at 5:03 AM, Noel Chiappa wrote:
This one:
http://mdfs.net/Software/PDP11/Assembler/AsmPDP.txt
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.
From: Brent
Hilpert
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 >> One assembler doc uses a prefix of
"&o"
So the answer is, by modern expectations the old standard would be
ambiguous or misleading.