Real-Time

Clock

Bytes

 

(Hex

000–00D):

Bit

definitions

and

 

 

 

addresses for the real-time

clock

bytes

are

shown

in

Figure 2-16.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

009

 

Year

 

 

9

 

 

 

 

 

 

 

 

00A

 

Status

register

A

10

 

 

 

 

 

 

 

00B

 

Status

register

B

11

 

 

 

 

 

 

 

00C

 

Status

register

C

12

 

 

 

 

 

 

 

00D

 

Status

register

D

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

2-16. Real-Time

Clock

Bytes

(Hex

000–00D)

 

 

 

 

 

 

Note:

The

setup

program

initializes

status

registers

A

and

B when

 

the time and date are set. Interrupt 1AH is the BIOS

 

interface to read and set the time and date; it initializes the

 

registers

in

the

same

way that the

setup program

does.

Status

Register A

(Hex

00A)

 

 

 

 

 

 

 

 

 

BitFunction

7Update in progress (UIP)

6-4Division Chain Select (DVx)

3–0Rate-selection bits

Figure

2-17. Status

Register

A (Hex

00A)

 

 

 

Bit

7

This bit

is

a

status

flag

that can

be monitored. If this bit

 

 

is 1, the update transfer will soon

occur. If this bit 0, the

 

 

update

transfer

will

not

occur forµs. at least

244

Bits

6–4

These bits control the divider chain

for the

oscillator.

Bits

3–0

These bits allow the selection of a divider output

 

 

frequency or

disable

the

divider output.

 

System Board 2-21

Page 43
Image 43
IBM 600 manual These bits control the divider chain For Oscillator, These bits allow the selection of a divider output

600 specifications

The IBM 600 series is a notable line of enterprise-level servers that has garnered attention for its robust performance, advanced features, and scalability suitable for large organizations. Originally introduced as part of IBM's initiative to provide businesses with powerful computing solutions, the IBM 600 servers have evolved to meet the growing demands of modern data environments.

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