IRQ Resources and DMA Channels

 整理于CBT CompTIA A+

 

IRQ Assignment

• 0 System timer
  
• 1 Keyboard controller
  
• 2 Second IRQ controller to bridge to IRQ 9
  
• 3 Serial Port 2 (COM2)
  
• 4 Serial Port 1 (COM1)
  
• 5 Hard disk controller
  
• 6 Floopy disk controller
  
• 7 Parallel port (LPT1)
  
• 8 Real-time clock
  
• 9-11 Available
  
• 12 Mouse Port or available
  
• 13 Math coprocessor
  
• 14 Primary IDE
  
• 15 Secondary IDE

 

 

DMA Channels

• 0 Some sound cards
• 1 Sound Blaster cards and emulators
• 2 Floopy drive
• 3 LPT port in ECP(DMA1 may be alternate)
• 4 System reserved
• 5 sound card
• 6 User hardware
• 7 User hardware