RT-11 idle light pattern

[Charles Anthony]

On Sun, Dec 31, 2017 at 6:41 AM, Noel Chiappa via cctalk <
cctalk at classiccmp.org> wrote:

>
>
>     > Stranger still is the "fancy" lights in RSTS ... "Fancy" because it
>     > produces a rotating pattern not just in the data lights which is
> easy,
>     > but also in the address lights. It runs in supervisor mode
>
> Ah; it must busy loop at loops spread across the address space? Clever!
> (Perhaps using the mapping hardware so that it doesn't use too much
> _actual_
> memory.) Is the source available?
>
>
I'm not familiar with that memory mapping hardware so this is idle
speculation: mapping every virtual page  to the same physical page and the
idle loop instead of "jump to top of loop" does "jump to top of loop + page
size"

-- Charles