RT-11 idle light pattern
charles.unix.pro at gmail.com
Sun Dec 31 11:38:17 CST 2017
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
> > 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
> 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
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