TPREF

TPREF is the reference time for Mark II tape changes. When automatic tape changes are specified, as is done by default, they will occur at times that are an integral number of tapelengths (default 4 hours) before or after this time. Since the only really valid Mark II tape length of 4 hours divides a 24-hour day evenly, no provision is provided to specify a day.

• Argument: A time.
• Options: Any valid time between 0 and 24 hours.
• Default: Not used; rather start time of earliest scan of the schedule is used.
• Usage: Only one value accepted.
• Example: TPREF=5:0:0