On 3/2/19 3:27 PM, Richard Cini via vcf-midatlantic wrote:
Ok, this might be a stupid question, but is there an eqivalent of a battery-backed time-of-day clock on the PDP-11? I know that it has a LTC signal on the bus which gives basic timing, and RT-11 has both date and time commands which aren’t retained through power cycles. It reminds me of the early PCs when there was no real TOD clock board.
I found an M7952 real time clock board, but that looks more like an interval timer board. I also found the M4002 board but that seems like the same thing.
Thanks!
Codar made a nice one for Qbus for a long time; I don't know if they made a Unibus version. They pop up every now and then, I've seen them on eBay. I have a couple if you get desperate. There is software for them in the DECUS archives, etc. -Dave -- Dave McGuire, AK4HZ New Kensington, PA