> On Dec 31, 2017, at 9:41 AM, Noel Chiappa via cctalk <cctalk@classiccmp.org> > wrote: > >> From: Paul Koning > >> RSTS-11 V4, which had a major reliability problem ... As part of trying >> to keep the customer placated, DEC supplied full OS sources, 5 >> dectapes. ... We printed them ... I still have copies of those files. > > Is that version available online? If not, maybe an OCR project?
I don't know; if not I should dig through mine and submit it to Bitsavers. I don't have the original DECtapes, but rather a copy of the files on magtape, so metadata is largely missing but the actual files should be there. > (Although I know other versions of RSTS-11 are available, so maybe it's not > rare enough to make the tedium of OCR worth it. That has been used on a > number of systems; notably CTSS, but also the IMP code and the Apollo > Guidance Computer, that I know of. I'm currently looking into getting an > early version of MERT, and that may also come down to OCR - if we're lucky!) > > >> 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? Correct, it uses the MMU so it only needs 64 bytes of table space to get the low order bits right. See attached. paul