
B
B
Appendix B: I/O Map
I/O Map
The following defines the I/O addresses decoded by the EPC-7. It does not define
addresses that might be decoded by EXMs in the EPC-7.
Port
Functional
group
Usage
00
DMA
Channel 0 address
01
Channel 0 count
02
Channel 1 address
03
Channel 1 count
04
Channel 2 address
05
Channel 2 count
06
Channel 3 address
07
Channel 3 count
08
Command/status
09
DMA
request
0A
Command register (R)
Single-bit DMA req mask(W)
0B
Mode
0C
Set byte pointer (R)
Clear byte pointer (W)
0D
Temporary register (R)
Master clear (W)
0E
Clear mode reg counter (R)
Clear all DMA req mask(W)
0F
All DMA request mask
20
Interrupt controller 1
Port 0
21
Port 1
24
83000 Controller
Data register
26
Index
register
40
Timer
Counter 0
41
Counter 1
42
Counter 2
43
Control
(W)
60
Keyboard controller
Data I/O register
61
NMI status
NMI status
64
Keyboard controller
Command/status register
70
Real-time clock
RTC index reg / NMI enable
71
RTC data register
0
seconds
1
seconds
alarm
Port
Functional
group
Usage
2
minutes
Page B1
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