On 2017-04-10, at 10:08, Tony Harminc wrote: > ... > STCK DWORD S/370 clock in IBM TOD units (bit 51 = 1uS) > LM R14,R15,DWORD TOD CLOCK UNITS in R14,R15 > SRDL R14,12 MICROSECONDS SINCE JAN 1, 1900 > ... > Of course the value in DWORD doesn't have to come directly from STCK. It > can as well be a stored value, but take care that it's not before 1970... > Are you concerned with bit 0 of the TOD clock's changing? I think this happens a little after 1970. And the whole TOD clock resets in 2042 (? it's hard to find a reference.)
STCKE solves this for over another century, provided that IBM comes to support the top byte in hardware and software. -- gil
