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EPC-3307 Hardware Reference
74
Table A-4. Time/counter functions
I/O Addr
Functional group
R/W
Usage
0040
Timer/counter
R/W
Counter 0 count
0041
R/W
Counter 1 count
0042
R/W
Counter 2 count
0043
W
Command mode
Table A-5. Keyboard controller
I/O Addr
Functional group
R/W
Usage
0060
Keyboard
controller
R/W
R
Data I/O register
Reset Xbus IRQ12/M and IRQ1
0061
NMI status and control
R
W
NMI status
NMI control
0064
Keyboard controller
R
W
Status register
Command register
Table A-6. Real-time clock
I/O Addr
Functional group
R/W
Usage
0070
Real-time clock,
NMI
W
RTC index register = bits 6–0
NMI enable = bit 7
0071
R/W
RTC data register
0
seconds
1
seconds alarm
2
minutes
3
minutes alarm
4
hours
5
hours alarm
6
day of week
7
date of month
8
month
9
year
A
status A
B
status B
C
status C
D
status D
E...3F
NVRAM
Table A-7. POST checkpoint
I/O Addr
Functional group
R/W
Usage
0080
POST checkpoint
W
Phoenix BIOS status information
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