March Products 120 III (PC620) User Manual
Page 127
User Manual version 2503
LIBRA 120 III (PC620 Intel 815E)
6-117
D: System I/O Ports
Address range (Hex) Device
000-01F
DMA controller
020-021
Interrupt controller 1, master
022-023
Chipset address
040-05F
8254 timer
060-06F
8024 keyboard controller
070-07F
Real time clock, non-maskable
interrupt mask (NMI)
080-09F
DMA page register
0A0-0BF
Interrupt controller 2
0C0-0DF
DMA controller
0F0
Clear math co-processor
0F1
Reset math co-processor
0F8-0FF
Math co-processor
1F0-1F8
Fixed disk
200-207
Game Port (not used)
443
Watchdog timer
143
Watchdog timer
208
DIO port
2E8
Serial port #4
2F8-2FF
Serial port #2
300-31F
Prototype card (not used)
330-331
MPU-401 Compatible
360-36F
Reserved
378-37F
Parallel printer port 1 (LPT1)
380-38F
SDLC, bisynchronous 2 (not used)
3A0-3AF
Bisynchronous 1 (not used)
3B0-3BF
Monochrome display and printer
adapter (LPT1) (not used)
3C0-3CF
Reserved
3D0-3DF
Color/graphics monitor adapter
3E8
Serial port #3
3F0-3F7
Diskette controller
3F8-3FF
Serial port #1
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