4 May
2025
4 May
'25
7 p.m.
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(a)classiccmp.org>
Cc: Peter Ekstrom <epekstrom(a)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(a)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(a)classiccmp.org> wrote:
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(a)classiccmp.org>
>wrote:
>> On Sat, May 3, 2025 at 12:08 PM Christopher Zach via cctalk
>> <cctalk(a)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
>>
>--
>jsw(a)ieee.org
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/