455
455
System
Resources
This appendix lists the preassigned IRQ levels, DMA channels
and I/O port addresses. Because system resources are dynamically
assigned during start up by the Plug and Play standard, the system
configuration may change every time the computer starts. To
determine what system resources are available, the following
tables are provided.
IRQ Line Assignments
The direct lines to the CPU are called an Interrupt ReQuest (IRQ)
lines. To find an IRQ for a device, select an available IRQ if possi-
ble, otherwise select an IRQ that is normally reserved for a device
you are not using. The following table lists the IRQ line assign-
ments for the Portégé 650CT computer:
IRQ (decimal) Status
Device/Notes
0
Reserved
Programmable Interval Timer (PIT)
1
Reserved
Keyboard Controller
2
Reserved
Programmable Interrupt Controller
3
Normally reserved COM2
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 ...