Irq
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Prologic Recruitment Ltd Training Division
A+ Part I Computer Hardware
IRQ/PORTS
Mathew Abraham Prologic Recruitment Ltd.
1
IRQ/PORTS Overview Terminology Examples - IRQ - PORTS Troubleshooting
Prologic Recruitment Ltd.
2
IRQ/PORTS
IRQ – Interrupt Request each device (ISA and VESA bus) is assigned a unique IRQ. The IRQ is used to interrupt the CPU and let it know that the device needs attention. The CPU knows which device is requesting attention by IRQ address. Prologic Recruitment Ltd.
3
I/O Address
The I/O address used by the CPU to communicate back the device. The CPU will run the program loaded in the I/O address assigned to the requesting device, to service the request.
Prologic Recruitment Ltd.
4
How this works?
Prologic Recruitment Ltd.
5
PCI IRQ sharing
Prologic Recruitment Ltd.
6
Ports
Port – a connection that a peripheral can plug into. Modern PCs comes with the following:-
Prologic Recruitment Ltd.
7
Ports
Prologic Recruitment Ltd.
8
Ports
Prologic Recruitment Ltd.
9
Address Assignments
Prologic Recruitment Ltd.
10
IRQ Assignments
Prologic Recruitment Ltd.
11
IRQ 2
Prologic Recruitment Ltd.
12
DMA (Direct Memory Access)
Original 8 bit ISA BUS - DMA channel 0-3 (4)
Newer 16- bit ISA Bus - DMA Channels 0-7 (8)
Prologic Recruitment Ltd.
13
Troubleshooting
Resource Conflicts - Two devices using the IRQ at the same time (ISA Bus). - Can device’s resource usage be changed? Bios Jumpers Software Prologic Recruitment Ltd.
14
Setting by software
Prologic Recruitment Ltd.
15
A+ Part I Computer Hardware
IRQ/PORTS
Mathew Abraham Prologic Recruitment Ltd.
1
IRQ/PORTS Overview Terminology Examples - IRQ - PORTS Troubleshooting
Prologic Recruitment Ltd.
2
IRQ/PORTS
IRQ – Interrupt Request each device (ISA and VESA bus) is assigned a unique IRQ. The IRQ is used to interrupt the CPU and let it know that the device needs attention. The CPU knows which device is requesting attention by IRQ address. Prologic Recruitment Ltd.
3
I/O Address
The I/O address used by the CPU to communicate back the device. The CPU will run the program loaded in the I/O address assigned to the requesting device, to service the request.
Prologic Recruitment Ltd.
4
How this works?
Prologic Recruitment Ltd.
5
PCI IRQ sharing
Prologic Recruitment Ltd.
6
Ports
Port – a connection that a peripheral can plug into. Modern PCs comes with the following:-
Prologic Recruitment Ltd.
7
Ports
Prologic Recruitment Ltd.
8
Ports
Prologic Recruitment Ltd.
9
Address Assignments
Prologic Recruitment Ltd.
10
IRQ Assignments
Prologic Recruitment Ltd.
11
IRQ 2
Prologic Recruitment Ltd.
12
DMA (Direct Memory Access)
Original 8 bit ISA BUS - DMA channel 0-3 (4)
Newer 16- bit ISA Bus - DMA Channels 0-7 (8)
Prologic Recruitment Ltd.
13
Troubleshooting
Resource Conflicts - Two devices using the IRQ at the same time (ISA Bus). - Can device’s resource usage be changed? Bios Jumpers Software Prologic Recruitment Ltd.
14
Setting by software
Prologic Recruitment Ltd.
15
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