IBM Personal System/2 50 User Manual

CMOS RAM Configuration
The following shows the bit definitions for the CMOS RAM
configuration bytes.
Diagnostic Status Byte (Hex 00E)
w =
=
Function
Real-Time Clock Chip Power
Configuration Record and Checksum Status
Incorrect Configuration
Memory Size Miscompare
Fixed Disk Controller/Drive C Initialization Status
Time Status Indicator
Adapter Configuration Miscompare
Adapter ID Time-Out OA
NORTON
Figure 3-16. Diagnostic Status Byte
Bit7 When set to 1, this bit indicates the real-time clock chip
lost power.
Bit6 When this bit is set to 1, the checksum is incorrect.
Bit 5 This is a check, at power-on time, of the Equipment byte.
When set to 1, the configuration information is incorrect.
Power-on checks require that at least one diskette drive
be installed (bit 0 of the Equipment byte, hex 014,
is set to 1).
Bit 4 When set to 1, this bit indicates the power-on check
determined that the memory size is not the same as in the
configuration record.
Bit 3 When set to 1, this bit indicates that the controller or drive
C failed initialization, which prevents the system from
attempting a power-on reset.
Bit 2 When set to 0, this bit indicates the time is valid. When
set to 1, this bit indicates the time is invalid.
Bit 1 This bit indicates if the installed adapters match the
configuration information. When this bit is set to 1, the
adapters do not match the configuration information.
Bit 0 When set to 1, this bit indicates a time-out occurred while
an adapter ID was being read.
Model 50 System Board — October 1990 3-19

IBM Personal System/2 50 Specifications

General

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