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-18- MBM-530NS User’s Manual
1.4.2 Real-Time Clock and Non-Volatile RAM
The MBM-530NS contains a real-time clock compartment that maintains the date
and time in addition to storing configuration information about the computer system.
It contains 14 bytes of clock and control registers and 114 bytes of general purpose
RAM. Because of the use of CMOS technology, it consumes very little power and
can be maintained for long periods of time using an internal Lithium battery. The
contents of each byte in the CMOS RAM are listed as follows:
Address Description
00
Seconds
01
Second alarm
02
Minutes
03
Minute alarm
04
Hours
05
Hour alarm
06
Day of week
07
Date of month
08
Month
09
Year
0A
Status register A
0B
Status register B
0C
Status register C
0D
Status register D
0E
Diagnostic status byte
0F
Shutdown status byte
10
Diskette drive type byte, drive A and B
11
Fixed disk type byte, drive C
12
Fixed disk type byte, drive D
13
Reserved
14
Equipment byte
15
Low base memory byte
16
High base memory byte
17
Low expansion memory byte
18
High expansion memory byte
19-2D
Reserved
2E-2F
2-byte CMOS checksum
30
Low actual expansion memory byte
31
High actual expansion memory byte
32
Date century byte
33
Information flags (set during power on)
34-7F
Reserved for system BIOS
Содержание MBM-530NS
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