>One other thing remains. Most PDP11s have what's called a 'line time
>clock' -- basically an interrupt every mains cycle. This is counted by
>the real time clock program in most OSes, and used to keep real time,
>etc. Of course if you move a machine from 60Hz to 50Hz power or vice
>versa, the real time clock will run slow/fast until you re-SYSGEN the OS
>for the appropriate frequency. This is not a big problem -- things still
>work -- though.
Actually, the KDJ11-B based machines allowed any of the following
settings for the LTC interrupt rate:
1) Line time clock (tied to power supply)
2) 50 Hz
3) 60 Hz
4) 800 Hz
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '_at_' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL:
http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg |
+--------------------------------+-------------------------------------+
Received on Sat Mar 25 2000 - 12:42:53 GMT