Hi Warner,

On Mon, Oct 28, 2019 at 04:08:53PM -0600, Warner Losh wrote:
> VENIX 2.0 had this. It was a Pure AT&T syntax w/o % signs:
>
> eg
> |
> | VENIX/86 start off (bootstrap starts execution at location 0 `start').
> |
> | Relocate complete kernel down to low memory.
>         .text
> start:  cli
>         mov     dx,#LOWMEM      | base of relocated kernel
>         mov     cx,cs
>         cmp     cx,dx           | are we there (put there by bootstrap) ?
>         beq     L0002           | Yes.
>         mov     ds,cx
>
> which is clearly op dst, src.

op dst, src is Intel syntax.  AT&T syntax has op src, dst like MACRO-11.
There are a number of other differences: (a) | instead of / or # as a comment
character (b) different mnemonics (beq instead of je) and (c) # instead of $
as the comment character.

Without seeing some more code, I'd say it's not AT&T syntax.