Source code for the rtc -- the KW11-L and KW11-P diagnostics are available on BitSavers et al via goo.
MAINDEC-11-DDKWA for the KW11-L line frequency clock and MAINDEC-11-DDKWB for the KW11-P real time clock (ie 50/60/10k and 100k Hz). I appreciate this is agricultural, but these are probably the best specifications of the KW11's available. There are also the KW11-W watchdog timers, the Qbus derivatives, counter / timers boards to support data acquisition, and of course the time of day clocks. Usage of the CSRs and vectors seems quite a fankle, but that is an XFU. Specimen CSR/VEC/BR may be - line frequency / programmable clock 777546 / 100 / BR6 - watchdog timer 777544 / 104 / BR7 - ToD RTC float / float / BR4 HtH; Martin -----Original Message----- From: Peter Ekstrom via cctalk [mailto:cctalk@classiccmp.org] Sent: 04 May 2025 15:35 To: General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Cc: Peter Ekstrom <epekst...@gmail.com> Subject: [cctalk] Re: PDP-11 hardware clock It is still a 'good to have' for those running real PDP-11 machines without I/D support, like the 11/23 and 11.23+. The TCP/IP stack Johnny has written works great on the machines (emulated or real) that do support I/D space. I would really like to have Johnny's TCP/IP stack on my 11/23+ but I understand it is a big undertaking to modify the stack to work on non-I/D space systems. DECnet works though but lacks NTP-like utilities. -Peter On Sun, May 4, 2025 at 10:23 AM Christopher Zach via cctalk < cctalk@classiccmp.org> wrote: > Neat! Is the rsx code or source code for the rtc anywhere? It's less > necessary now that we have ntp from the tcp stack (thank you bqt) but > it would still be cool > > On May 4, 2025 2:08:35 AM EDT, Jerry Weiss via cctalk < > cctalk@classiccmp.org> wrote: > >My note in the DEC VCF forum might give you some more background. > > > > > https://forum.vcfed.org/index.php?threads/real-time-clock-card-gtsc306 > a-adding-calender.71542/ > > > https://bitsavers.trailing-edge.com/pdf/gtsc/979-0021-306_GTSC306_Sep8 > 8.pdf > > > >The DEC KWV-11 is designed to support analog and digital acquisition > >boards. See EK-ADV11-OP-002 ADV11-A, KWV11-A, AAV11-A, DRV11 User's > >Manual.pdf. > > > >On Sat, May 3, 2025 at 9:18 PM Ethan Dicks via cctalk < > cctalk@classiccmp.org> > >wrote: > > > >> On Sat, May 3, 2025 at 12:08 PM Christopher Zach via cctalk > >> <cctalk@classiccmp.org> wrote: > >> > Interesting. I have one does it emulate a kw11? Can it keep the > >> > date > and > >> time between reboots? > >> > >> I think it's a KWV11 plus an RTC. That MicroPDP-11/53 came with > >> MicroRSX-11 and there was a program for reading the RTC. It > >> complains when I boot it up and the board is missing. > >> > >> It shouldn't be impossible to figure out how it all works and write > >> a program for RT-11 or possibly 2BSD to read the time. > >> > >> Oh... there are product variants for how much of the board is > >> populated. I think mine is "RTC only". > >> > >> -ethan > >> > > > > > >-- > >j...@ieee.org >
