Thanks for the clarification! -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Tony Harminc Sent: Saturday, May 11, 2024 9:11 PM To: [email protected] Subject: Re: [EXTERNAL] Re: JOB card format
On Thu, 9 May 2024 at 15:01, Phil Smith III <[email protected]> wrote: > [...] > Since classic timer units are close to microseconds > [...] > Ah, no. We've been through this one before - the last time here in 2018 as far as I can see. A (classic) Timer Unit is about 26 μs, which is the notional tick rate of bit 30 of the old S/360 Interval Timer. But this kind of Timer Unit continues to be available in some interfaces on z/OS, though the Interval Timer is long gone. Bit 31 of the TOD clock ticks close enough to a one second rate that the high half of the clock can be used to count seconds for many human interface purposes. Bit 51 of the TOD clock ticks at (exactly) the 1 μs rate, and hence bit 63 at 2**-12 μs. According to the PofO this last is called a "clock unit". Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
