[... 50hz.mac deleted ...] Tim - I'm surprised at you... simply setting this bit is *not* sufficient. The bit is set based on assembly parameters. Those parameters also set the values for ticks/day based on 50 and 60 hz. Those values are patched at boot time to reflect what the system thinks the clock is supposed to be (what it was genned for). Without the other counters set correctly, date rollover won't work at all correctly... since it will be waiting for sufficient clock ticks at the 60hz rate to have gone by before it bumps the clock. I seem to recall that there is another gotcha to this, but haven't yet found it in the sources... Bottom line is that the config bits are supposed to be read, not written, as they indicate what the system was built for or what it has determined (via probe) to be running on... 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 '@' 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 | +--------------------------------+-------------------------------------+