Xycom AHIP-370, Manual

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AHIP-370 Manual
18
I/O Map
The I/O map for the AHIP-370 in Table 2- 6 contains all the I/O ports of the IBM AT
architecture with some additions.
Table 2- 6. I/O Map
Hex Range Device
000-01F DMA controller 1, 8237A-5 equivalent
020-021 Interrupt controller 1, 8259 equivalent
022-024 Available
025-02F Interrupt controller 1, 8259 equivalent (see Note 3)
040-05F Timer, 8254-2 equivalent
060-06F 8742 equivalent (keyboard)
070-07F Real Time Clock bit 7 NMI mask (see Note 3)
080-091 DMA page register (see Note 3)
092 Reset/ Fast Gate A20
93-9F DMA page register (see Note 3)
0A0-0BF Interrupt controller 2, 8259 equivalent (see Note 3)
0C0-0DF DMA controller 2, 8237A-5 equivalent (see Note 3)
0F0 N/A
0F1 N/A
0F2-0F3 N/A
0F4 IDE ID port
0F5-0F7 N/A
0F8 IDE Index port
0F9-0FB N/A
0FC IDE Data port
0FD-0FF N/A
100 Available
102 C&T Global enable register
103-179 Available
180-181 SRAM control register (May be remapped based on I/O port 234h)
182-1EF Available
1F0-1F7 IDE Controller (AT Drive)
1F8-22F Available
231 Xycom LED port
233 Xycom Flash control register
234 Xycom IO port control register
278-27F Parallel Port 2 (see Note 1)
280-2F7 Available
2F8-2FF Serial Port 2 (see Note 1)
300-36F Available
370-377 Alt. Floppy Disk Controller (see Note 1)
378-37F Parallel Port 1 (see Note 1)
380-3AF Available
3B0-3BB mono mode video