I/O Map - Xycom AHIP6+ Manual

Chapter 2 – Installation

I/O Map

The I/O map for the AHIP6+ in Table 2- 6 contains all the I/O ports of the IBM AT
architecture with some additions.
Hex Range
000-01F
020-021
022-024
025-02F
040-05F
060-06F
070-07F
080-091
092
93-9F
0A0-0BF
0C0-0DF
0F0
0F1
0F2-0F3
0F4
0F5-0F7
0F8
0F9-0FB
0FC
0FD-0FF
100
102
103-179
180-181
182-1EF
1F0-1F7
1F8-22F
231
233
234
278-27F
280-2F7
2F8-2FF
300-36F
370-377
378-37F
380-3AF
Table 2- 6. I/O Map
Device
DMA controller 1, 8237A-5 equivalent
Interrupt controller 1, 8259 equivalent
Available
Interrupt controller 1, 8259 equivalent (see Note 3)
Timer, 8254-2 equivalent
8742 equivalent (keyboard)
Real Time Clock bit 7 NMI mask (see Note 3)
DMA page register (see Note 3)
Reset/ Fast Gate A20
DMA page register (see Note 3)
Interrupt controller 2, 8259 equivalent (see Note 3)
DMA controller 2, 8237A-5 equivalent (see Note 3)
N/A
N/A
N/A
IDE ID port
N/A
IDE Index port
N/A
IDE Data port
N/A
Available
C&T Global enable register
Available
SRAM control register (May be remapped based on I/O port 234h)
Available
IDE Controller (AT Drive)
Available
Xycom LED port
Xycom Flash control register
Xycom IO port control register
Parallel Port 2 (see Note 1)
Available
Serial Port 2 (see Note 1)
Available
Alt. Floppy Disk Controller (see Note 1)
Parallel Port 1 (see Note 1)
Available
2-5