System i/o address map, A-16, A-16 specifications – Epson 4000 User Manual
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System I/O Address Map
System I/O address map
Hex address
Assigned device
000-01F
DMA controller 1, 8237
020-03F
Interrupt controller 1, 8259, master
022-024
Chip set configuration register
040-05F
timer, 8254
060-06F
Keyboard controller, 8042
070-07F
Real-time clock NMI (non-maskable interrupt) mask
(CMOS)
080-09F
DMA page register, 74LS612
0A0-0BF
Interrupt controller 2, 8259A
0B4, 0BB
AD12 control register
0BC
AD12 control register
0C0-0DF
DMA controller 2, 8237
0F0
Clear math coprocessor busy
0F1
Reset math coprocessor
0F8-0FF
Math coprocessor
1F0-1F8
Hard disk
200-207
Game I/O
278-27F
Parallel printer port 2
2B0-2DF
Alternate enhanced graphics adapter
2E1
GPIB (adapter 0)
2E2, 2E3
Data acquisition (adapter 0)
2F8-2FF
Serial port 2
300-31F
Prototype card
360-363
PC network (low address)
368-36B
PC network (high address)
A-16 Specifications