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ETX-945 User Manual 1.00 www.diamondsystems.com Page 32
5.2 I/O Port Address Map
Each peripheral device in the system is assigned a set of I/O port addresses, which also become the identity of
the device. The following table lists the I/O port addresses used:
Address
Device Description
00000000 - 00000007
DMA Controller
00000000 - 00000CF7
PCI bus
00000010 - 0000001F
Motherboard Resource
00000020 - 00000021
Programmable Interrupt Controller
00000022 - 0000003F
Motherboard Resource
00000040 - 00000043
System Timer
00000044 - 0000005F
Motherboard Resource
00000060 - 00000060
Standard 0 / 02-Key or Microsoft Natural PS/2 Keyboard
00000061 – 00000061
System Speaker
00000062 - 00000063
Motherboard Resource
00000064 - 00000064
Standard 0 / 02-Key or Microsoft Natural PS/2 Keyboard
00000065 - 0000006F
Motherboard Resource
00000070 - 00000073
System CMOS/real time clock
00000074 - 0000007F
Motherboard Resource
00000080 - 00000090
DMA Controller
00000091 - 00000093
Motherboard Resource
00000094 - 0000009F
DMA Controller
000000A0 - 000000A1
Programmable Interrupt Controller
000000A2 - 000000BF
Motherboard Resource
000000C0 - 000000DF
DMA Controller
000000E0 - 000000EF
Motherboard Resource
000000F0 - 000000FF
Numeric Data Processor
000001F0 - 000001F7
Primary IDE Channel
00000274 - 00000277
ISAPNP Read Data Port
00000279 - 00000279
ISAPNP Read Data Port
00000294 - 00000297
Motherboard Resource