I used RT-11 versions 4 and 5, and I seem to remember the MACRO-11 there 
had .ASCIZ.

On 12/16/2022 02:02 PM, Warner Losh wrote:
>
>
> On Fri, Dec 16, 2022, 1:12 PM Dave Horsfall <dave@horsfall.org 
> <mailto:dave@horsfall.org>> wrote:
>
>     On Fri, 16 Dec 2022, Dr Iain Maoileoin wrote:
>
>     > I remember running into a .asciz directive n the 70s
>     “somewhere”. It was
>     > an assembler directive in one of the RT11 systems??? or perhaps
>     the unix
>     > bootstrap and/or “.s” files - when I get some time I will go
>     read some
>     > old code/manuals.
>
>     MACRO-11 on RSX-11D seems to ring a bell...
>
>
> I first encountered it on RSTS/E 6C in the MACRO-11 it had... But the 
> v6 macro assembler from DEC via Harvard that eventually wound up in 
> 2BSD is older and dates to 1977 or so.
>
> Warner