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EPC-9 Hardware Reference
A
A
A-2
Keyboard Port
I/O Addr
Functional group
Usage
060
Keyboard controller
Data I/O register
061
NMI status
NMI status
064
Keyboard controller
Command/status register
Time-of-Day Clock
I/O Addr
Functional group
Usage
070
Real-time clock
RTC index reg / NMI enable
071
RTC data register (64 bits)
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
RAM
Phoenix NuBIOS
I/O Addr
Usage
080
Phoenix BIOS Status Information
DMA Page Registers
I/O Addr
Functional group
Usage
081
DMA
Channel 2 page register
082
Channel 3 page register
083
Channel 1 page register
087
Channel 0 page register
089
Channel 6 page register
08A
Channel 7 page register
08B
Channel 5 page register
08F
Refresh page register
Port A
I/O Addr
Functional group
Usage
092
Port A
Fast A20 and reset control
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