INT 1A,2 - Read Time From Real Time Clock (XT 286,AT,PS/2)

AH = 02

on return:

CF = 0 if successful

= 1 if error, ~RTC~ not operating

CH = hours in BCD

CL = minutes in BCD

DH = seconds in BCD

DL = 1 if daylight savings time option

- on AT with BIOS before 6/10/85, DL is not returned