IBM Aptiva C66
(250-0458) System Resources Faxback Doc. # 34533
This table shows the hexadecimal addresses for each of the system board
input/output (IO) functions. You may want to use this information if you
install an adapter card that requires you to set I/O or addresses.
Table 10: System I/O addresses
Address range Function
(hexadecimal)
0000-001F DMF controller
0020-0021 Interrupt controller 1
0040-0043 System timers
0060 Keyboard/mouse controller
0061 System control port B
0064 Keyboard/mouse controller
0070-0071 RTC/CMOS and NMI mask
0080-008F DMA controller
00A0-00A1 Interrupt controller 2
00B2-00B3 Reserved
00CO-00DF DMF controller
00EA-00ED Reserved
00F0-00FF Math coprocessor
0170-0177, 0376 Secondary IDE controller
01FO-01F7, 03F6 Primary IDE controller
0220-022F, 0388-0389 Mwave sound
0278-027F,67B-67A Parallel port 3
02E8-02EF Serial port 4
02F8-02FF Serial port 2
0330-0333 Mwave MIDI
0370-0371 Reserved
0378-037F, 77B-77A Parallel port 2
03BC-03BF, 7BC-7BE Parallel port 1
03CO-03CF, 3D4, 3D5, 03DA SVGA controller
03E8-03EF Serial port 3
03F2-03F5, 03F7 Diskette controller
03F8-03FF Mwave modem/fax or serial port 1
04DO-04D1 Reserved
0CF8-0CFC Reserved
CE30 Mwave system
FE80-FE8F Bus master IDE controller
FF00-FFFF SVGA controller
System interrupts
This table shows the system interrupt request (IRQs) and their functions.
You may use this information if you install an adapter card that requires
you to set IRQs.
Note: IRQ 11 may be used if Hardware MPEG is enabled.
Table 11: System board interrupts
Interrupt request (IRQ) Function
SMI Power management
NMI Parity error I/O channel check
0 Timer
1 Keyboard
2 Cascade to IRQ8-IRQ15
3 Serial port A
4 Mwave modem
5 Mwave sound
6 Diskette
7 Parallel port
8 Real-time clock
9 Mwave MIDI
10 Mwave DSP
11 User available
12 Mouse
13 Math coprocessor
14 Primary IDE
15 Secondary IDE
DMA channel assignments
This table shows the channel assignments for direct memory access (DMA).
DMA allows I/O devices to transfer data directly to and from memory. You
may need to select an open DMA channel if you add an I/O device that uses
DMA.
Table 12: DMA channel assignments
DMA channel Assignment
0 User available
1 Mwave sound
2 Diskette
3 ECP parallel port (default)
4 Cascade
5 User available
6 User available
7 Mwave system
Serial port addresses
IBM Aptiva PCs have a built-in external serial port already installed in
the computer. The connector for this port is located at the back of your
computer. This port can be used to connect a serial mouse, serial
printer, or other serial device and to transfer data between computers.
The built-in serial port supports these addresses and interrupts.
Address Windows 95 Interrupt Default
3F8 COM1 IRQ4 Modem
3E8 COM3
2F8 COM2 IRQ3 Serial port A
2E8 COM4
Conflicts may arise if you add adapter cards with serial ports or if you
change the address settings on your modem if you are using an operating
system other than Windows 95. You can resolve most of these conflicts by
using the Setup Utility to change serial port addresses. See "Changing
input/output port configuration" on page 37 for more information.
(BR/BKL-09/05/96)
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