System Resource Conflicts - IBM A40I TYPE 2271 Hardware Maintenance Manual
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Also See for A40I TYPE 2271:
- User manual (160 pages) ,
- Guía del usuario (108 pages) ,
- Benutzerhandbuch (106 pages)
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v POST Beep codes are sounds emitted from the speaker if the POST finds a
v Diagnostic error messages are displayed when a test program finds a problem
v Software-generated error messages are displayed if a problem or conflict is
v Multiple messages occur when the first error causes additional errors. Follow
System resource conflicts
System failures occur when there are system resource conflicts with the following:
v Interrupt Request Queue (IRQ)
v Direct Memory Access (DMA)
v I/O Address
v ROM and RAM Addresses.
IRQ
v Assigns a unique interrupt request line to every I/O device (line numbers range
v Interrupts the processor to force it to service the request.
v Handles interrupts on a priority basis (low numbers have the highest priority).
v Queues interrupt request.
IRQ conflicts occur when there are multiple assignments to the same interrupt
level. If there is an IRQ conflict, the system will hang. Use the systems diagnostics
to check for multiple assignments to the same interrupt level before replacing any
hardware component.
DMA
v Accesses the memory by bypassing the processor. This allows the processor
v Accesses memory directly from the serial and parallel ports on some systems.
v Accesses memory directly from some adapters using a DMA channel. This
v Provides from 4 to 15 DMA channels. The number varies depending on the
If multiple assignments of the same DMA channel occur, the system will hang.
Use the system diagnostics to check for multiple assignments to the same DMA
channel before replacing any hardware components.
I/O address
A unique I/O address is assigned to each system component.
If multiple assignments of the same I/O address occur, the system will hang. Use
the DOS MEM command to check for multiple assignments to the same I/O
address before replacing any hardware component.
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Hardware Maintenance Manual A40 Type 6840 A40P Type 6841 A40i Type 2271: IBM NetVista Computer
problem. One beep indicates that the POST completed successfully. Multiple
beeps indicate a problem was found.
with a hardware component.
found by an application program, the operating system, or both. For an
explanation of these messages, refer to the information supplied with the
installed software package. Also, refer to "Software considerations" on page 130.
the suggested action of the first error displayed.
from 0 to 15).
more time for applications and programs.
allows the adapter to operate faster.
system.
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