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Table C.10: System information I/O addresses
Address
00-0D
00
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
11
12
13
14
15
16
17
18
19-2D
2E-2F
30
31
32
33
34-3F
PCA-6145 User's Manual
Description
* Real-time clock information
Second
Second alarm
Minutes
Minute alarm
Hours
Hours alarm
Day of week
Date of month
Month
Year
Status register A
Status register B
Status register C
Status register D
* Diagnostic status byte
* Shutdown status byte
Diskette drive type byte, drives A and B
Reserved
Fixed disk type byte, drives C and D
Reserved
Equipment byte
Low base memory byte
High base memory byte
Low expansion memory byte
High expansion memory byte
Reserved
2-byte CMOS checksum
* Low expansion memory byte
* High expansion memory byte
* Date century byte
* Information flags (set during power on)
Reserved
66
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