The only thing we really used on RSTS was Basic Plus so I wouldn’t know, but I spent a lot of time making cross calls between MACRO-11 and FORTRAN on the RSX-11M and there was no MARK-based linkage in anything I saw.    I had the kind of odd misfortunate to spend one summer in college writing a database system in Fortran and Macro-11 on RT and when I graduated the company saw that and set me down to work on FORTRAN/MACRO-based database on their two processor RSX-11M system.



> On Jan 5, 2016, at 6:24 PM, Dave Horsfall <dave at horsfall.org> wrote:
> 
> On Mon, 4 Jan 2016, Ronald Natalie wrote:
> 
>> Just never figured out how to make good use of the MARK instruction on 
>> the PDP-11.
> 
> RSX-11 probably used it, though, as could've RSTS...
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