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Raptor AT – Installation Guide
44
I/O Map
Address (hex) Description
0000-000F DMA 1
0020-0021 Interrupt Controller 1
0040 Timer/Counter 0
0041 Timer/Counter 1
0042 Timer/Counter 2
0043 Timer Control Word
0060 Keyboard Controller Byte _ Reset IRQ
0061 NMI Status and Control
0070, bit 7 NMI enable
0070, bits 6:0 RTC Index
0071 RTC Data
0072 RTC Extended Index
0073 RTC Extended Data
0080-008F
DMA page registers / POST code display also
located at 0080h
0092 Port 92
00A0-00A1 Interrupt Controller 2
00B2-00B3 APM control
00C0-00DE DMA 2
00F0 Coprocessor Error
0110 Watch-Dog Timer (default)
0170 _ 0177 Secondary IDE channel
01F0 _ 01F7 Primary IDE channel
029x LM79
0278-027F LPT2 (if selected)
02E8-02EF COM4 (if selected)
02F8-02FF COM2 (default)
0310 Watch-Dog Timer (if selected)
0376 Secondary IDE channel command port
0377 Floppy channel 2 command
0377, bit 7 Floppy disk change, channel 2
0377, bits 6:0 Secondary IDE channel status port
0378-037F LPT1 (default)
03B4-03B5 Video (VGA)
03BA Video (VGA)
03BC-03CD LPT3 (if selected)
03C0-03CA Video (VGA)
03CC Video (VGA)
03CE-03CF Video (VGA)