[Info-vax] OT: PDP-11 history in arstechnica

[chris]

On 03/15/22 01:22, Simon Clubley wrote:
> On 2022-03-14, Bob Gezelter<gezelter at rlgsc.com>  wrote:
>> On Monday, March 14, 2022 at 7:47:34 PM UTC-4, Arne Vajhøj wrote:
>>> https://arstechnica.com/gadgets/2022/03/a-brief-tour-of-the-pdp-11-the-most-influential-minicomputer-of-all-time/
>> Arne,
>>
>> Not sure where the author of the arstechnica piece saw "$" for immediate mode, e.g., mov $10,r0. MACRO-11 as I new it, always used a "#", e.g., MOV #SS.XYZ,R0.
>>
>> Spent lots of time writing and generating assembler for RSX-11 systems and relatives, e.g., P/OS. Did many interesting things.
>>
>> - Bob Gezelter, http://www.rlgsc.com
>
> DEC versus AT&T syntax (and yes, I know the following is Intel not DEC,
> but it's much the same thing here for the syntax you mention):
>
> https://wiki.osdev.org/Opcode_syntax
>
> Perfectly normal and expected. Also note "mov src, dest" instead of
> "mov dest, src".

Yes, from, to, left to right. Same for 68000 series as well. Intel
always were a bit backward in that respect...

Chris

>
> Expect to see more of it in your future. :-)

>
> Simon.
>