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Table 4-1 Extensa Series I/O Address Map
Address Range Device
000-00F DMA Controller 1
020-021 Interrupt Controller 1
022-023 M1429 Registers
040-043 Timer 1
060-06E Keyboard Controller 8742 Chip Select
070-071 Real Time Clock and NMI Mask
080-08F DMA Page Register
0A0-0A1 Interrupt Controller 2
0C0-0DF DMA Controller 2
1F0-1F7 Hard Disk Select
178, 17A 6377 Registers
1F0-1F7 Hard Disk Select
3F6, 3F7
278-27F Parallel Port 3
35F, 36F Special I/O Ports
378, 37A Parallel Port 2
3BC-3BE Parallel Port 1
3C0-3C5
3C6-3C9 Video DAC
3C0-3CF Enhanced Graphics Display
3D0-3DF Color Graphics Adapter
3E0-3E1 PCMCIA Controller
3F0-3F7 Floppy Disk Controller
3F8-3FF Serial Port 1
Theory of Operation
4-3