briant@tsltor.uucp (Brian Taylor) (05/31/91)
We run several "pseudo" real time applications on our UNIX systems (ISC 2.2.1) but notice that like all DOS systems, the clock on these systems leaves a LOT to be desired (to say the very least). Could anyone recommend a reliable clock (i.e., one that wouldn't lose more than a few seconds yearly or better) that is supported under ISC? Any ideas of whom I can contact is also welcome. AtDhVaAnNkCsE ...briant -- Brian Taylor briant@tsltor.uucp UNIX Systems Administrator (...jtsv16!tsltor!briant) Teleride Sage Ltd. (416) 596-1940
lance@motcsd.csd.mot.com (lance.norskog) (06/05/91)
briant@tsltor.uucp (Brian Taylor) writes: >We run several "pseudo" real time applications on our UNIX systems (ISC 2.2.1) >but notice that like all DOS systems, the clock on these systems leaves a LOT >to be desired (to say the very least). >Could anyone recommend a reliable clock (i.e., one that wouldn't lose more than >a few seconds yearly or better) that is supported under ISC? Any ideas of whom >I can contact is also welcome. By real-time do you mean minutes, seconds, or milliseconds? If you need second-level accuracy, you can get a box that listens to sattelite radio and gives you a serial feed. Also, there are phone numbers where people who have these boxes feed them into the phone. For millisecond accuracy, you can use one of these lab I/O cards with counter-timers. You'll have to write your own device driver. Lance
campbell@dataco.UUCP (Duncan Campbell) (06/06/91)
I suspect that the only solution to this problem will involve the introduction of new hardware. Mebbe disect a high quality digital clock and stick it on a card with a register that can be read off the bus. Duncan ***--------------------------------------------------------------*** * DISCLAIMER: * * ==========: * * The opinions expressed are solely of the author and do not * * necessarily reflect the opinions of Canadian Marconi Company. * ***--------------------------------------------------------------***