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From: moroney@world.std.spaamtrap.com (Michael Moroney)
Newsgroups: alt.sys.pdp11,comp.sys.dec,comp.os.vms
Subject: Re: QBUS Prototyping
Date: Mon, 18 Apr 2011 17:26:43 +0000 (UTC)
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Johnny Billquist <bqt@softjar.se> writes:

>On 2011-04-18 05:56, Bob Koehler wrote:
>> In article<hr19ad$m2m$1@Iltempo.Update.UU.SE>, Johnny Billquist<bqt@softjar.se>  writes:
>>>
>>> (Oh, and a VAX is not a PDP... :-)
>>
>>     That's right.  No VAX ever implemented the MARK instruction.  Now
>>     can you find a PDP-11 programmer who actually used it?

>I used it.
>But only to test how to, and then decided "never more". :-)

I'm guessing that instruction was developed for some compiler(s) which had
some bizarre linkages for subroutines, and very few, if any, assembly
language programmers ever used it, beyond trying to figure out what to do
with it.

(next question, which compiler(s) used it?)