On Sun, Dec 31, 2017 at 6:41 AM, Noel Chiappa via cctalk < [email protected]> 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
