System Resources
DMA Channel Assignments
Part III: Appendixes
456
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.
4
Normally reserved COM1 Serial Port
5
Available
6
Reserved
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.
7
Normally reserved LPT1(ECP Parallel Port)
8
Reserved
Real-time clock (RTC)
9
Available
10
Available
11
Available
12
Reserved
PS/2 mouse
Resources are always reserved even
when drive is not installed.
13
Reserved
Numeric data processor
14
Normally reserved First hard disk drive
15
Normally Reserved Second hard disk drive or ATAPI
CD-ROM (SelectBay)
IRQ (decimal) Status
Device/Notes
Содержание PORTEGE 650CT
Страница 38: ...Let s Start at the Very Beginning Create or Purchase Master Diskettes Part I Getting To Know Your Computer 39 ...
Страница 71: ...Getting to Know the Desktop Lesson 14 Turning Your Computer Off Part I Getting To Know Your Computer 73 ...
Страница 210: ...Using Your Computer on Your Desktop Using the Optional Desk Station V Plus Part I Getting To Know Your Computer 219 ...
Страница 417: ...The Diagnostic Test ExitingtheDiagnosticMenus Part II Technical Reference 439 ...
Страница 442: ...System Resources Viewing and Changing System Resources Part III Appendixes 469 ...
Страница 458: ...Using Windows for Workgroups GettingHelp Part III Appendixes 487 ...