CMOS RAM Configuration

Figure 2-21 shows the bit definitions for the CMOS RAM configuration bytes.

Diagnostic Status

Byte (Hex 00E)

 

 

Bit

Function

 

 

7

Real-time clock power

6

Configuration record and checksum status

5Incorrect configuration

4Memory size mismatch

3

Hard

disk

controller/drive C initialization status

2

Time

status

indicator

1, 0

Reserved

 

Figure 2-21. Diagnostic

Status Byte

(Hex 00E)

 

 

 

 

 

Bit

7

If

set

to

1,

this

bit

indicates

that

the

real-time

clock

has

 

 

lost

 

power.

 

 

 

 

 

 

 

 

 

 

Bit

6

If

set

to

1,

this

bit

indicates

that

the

checksum

is incorrect.

Bit

5

This

 

bit indicates the results of a power-on check of the

 

 

equipment

byte (hex 014). If set to 1, this bit indicates

 

 

that

 

the

configuration

 

information is

incorrect.

 

 

 

Bit

4

If

set

to 1, this bit indicates that the memory size does not

 

 

match

 

the

configuration

information.

 

 

 

 

 

Bit

3

If

set

to

1,

this

bit

indicates

that

the

controller

or

hard disk

 

 

drive

failed initialization.

 

 

 

 

 

Bit

2

If

set

to

1,

this

bit

indicates

that

the

time is

invalid.

Bits

1,

These0

bits

are

reserved.

 

 

 

 

 

 

Shutdown Status Byte (Hex 00F): This byte is defined by the power-on diagnostic programs.

2-24 System Board

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Image 46
IBM 600 manual Cmos RAM Configuration, Set This Bit Indicates That Real-time Clock Has Lost Power, Bit Function

600 specifications

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