A-2 Appendix A: Specification tables
System input/output addresses
This table shows the hexadecimal addresses for each of the system board Input/Output (I/O) functions. You may want to use
this information if you install an adapter card that requires you to set I/O addresses.
Table 6: System input/output addresses
Address range (hexadecimal) Function
0000-001F DMA controller 1
0020-003F Interrupt controller 1
0040-0047 System timer
0050-0057 System timer
0060-006F System controller 8742
0070 CMOS RAM address and NMI mask
0078-007B Real-time clock
0080-009F DMA page register
00A0-00BF Interrupt controller 2
00C0-00DF DMA controller 2
00F0 Clear math coprocessor
00F1 Reset math coprocessor
0F8-0FF Math coprocessor
1F0-1F7 Primary IDE channel
170-177 Secondary IDE channel
0278-027F Parallel port 2
v65xahb.book : app-a.fm Page 2 Friday, January 16, 1998 4:27 PM
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