Specifications

EPC-6A Hardware Reference
18
0A Command register (R)
Single-bit DMA request 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
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
ERAM
...
3F RAM
80 BIOS debug port
81 DMA Channel 2 page register
82 Channel 3 page register
83 Channel 1 page register
87 Channel 0 page register
89 Channel 6 page register
Port Functional group Usage