
EPC-26A/27 Hardware Reference
Page B2
B
B
Counter-Timer functions:
PicoPower Redwood chip set emulating 8254 of PC/AT
I/O Addr
Functional group
Usage
040 Timer
Counter
0
041
Counter
1
042
Counter
2
043
Control
(W)
Keyboard Port:
PicoPower Redwood chip set emulating PC/AT
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:
PicoPower Redwood chip set emulating MC6818 of PC/AT
I/O Addr
Functional group
Usage
070
Real-time clock
RTC index reg / NMI enable
071
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
RAM
...
3F
RAM
DMA Page Registers:
PicoPower Redwood chip set emulating 74LS612 of PC/AT
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
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com