Dma Channel Assignments - Toshiba Portégé 650CT User Manual

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System Resources

DMA Channel Assignments

IRQ (decimal) Status
4 Normally reserved COM1 Serial Port
5 Available
6 Reserved
7 Normally reserved LPT1(ECP Parallel Port)
8 Reserved
9 Available
10 Available
11 Available
12 Reserved
13 Reserved
14 Normally reserved First hard disk drive
15 Normally Reserved Second hard disk drive or ATAPI
DMA Channel Assignments
Direct Memory Access (DMA) allows some devices to transfer
data to and from memory at high speeds, without using the CPU.
Such devices are each assigned a unique DMA channel. The
Portégé 650CT computer has two DMA controllers with four
channels on each controller, a total of eight DMA channels.
Part III: Appendixes
Device/Notes
3.5-inch diskette drive (Internal Select-
Bay, External FDD or Desk Station V
Plus SelectBay).
Resources are always reserved even
when drive is not installed.
Real-time clock (RTC)
PS/2 mouse
Resources are always reserved even
when drive is not installed.
Numeric data processor
CD-ROM (SelectBay)