IBM Personal System/2 50 User Manual

Real-Time Clock Bytes (Hex 000-00D)
Bit definitions and addresses for the real-time clock bytes are shown
in the following figure.
Address (Hex) Function Byte Number
000 Seconds 0
001 Second Alarm 1
002 Minutes 2
003 Minute Alarm 3
004 Hours 4
005 Hour Alarm 5
006 Day of Week 6
007 Date of Month 7
008 Month 8
00g Year 9
00A Status Register A 10
00B Status Register B 11
00Cc Status Register C 12
00D Status Register D 13
Figure 3-11. Real-Time Clock Bytes
Note: The Setup program initializes status registers A, B, C, and D
when the time and date are set. Interrupt hex 1A is the BIOS
interface to read and set the time and date and it initializes the
register the same way as the Setup program.
Model 50 System Board — October 1990 3-15

IBM Personal System/2 50 Specifications

General

Brand	IBM
Model	Personal System/2 50
Category	Desktop
Language	English