Dma Channel Assignments; Serial Port Addresses - IBM Aptiva Hardware Maintenance Manual

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 1- 5 DMA Channel Assignments Table
DMA channel Assignment
0 Available to user
1 Audio
2 Diskette drive
3 Audio/ECP
4 Cascade
5 Available to user
6 Available to user
7 Available to user

Serial Port Addresses

The built-in serial port supports these addresses and interrupts.
Table 1- 6 Serial Port Addresses Table
Address Windows 95
3F8 COM1
2F8 COM2
3E8 COM3
2E8 COM4
Interrupt Default
IRQ 4 Modem
IRQ 3 Serial port
IRQ 4
IRQ 3
General Information 1-13