29 Dec
2017
29 Dec
'17
9:45 a.m.
On Dec 29, 2017, at 9:16 AM, Noel Chiappa via cctalk
<cctalk at classiccmp.org> wrote:
Yes, a bit weird indeed. Stranger still is the "fancy" lights in RSTS, also an
Anton Chernoff creation. "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, in versions of RSTS that did not use that mode for real work.
paul
From: Paul Koning
Here's what it looked like
Not having RT11, I embedded this in a small stand-alone program (which took a
little work, Unix assembler being rather different :-), so I could see it (it
wasn't obvious from the code what it did).
Pretty clever, to get that complex a pattern out of so few instructions.
Although the self-modifying code is, err.... (If anyone wants the source or
.LDA, let me know, I can post/upload it.)