have the advantage of faster throughput, but the
disadvantage of limited error-handling capability and
reduced software and hardware compatibility and
flexibility. This method is not used in the IBM PC
Series systems.
Operating system to BIOS to hardware. This is the
recommended way. It's the most flexible because it's
independent of the hardware.
Applications to operating system to BIOS to
hardware. This method is inflexible and operating
system dependent.
Applications to BIOS to hardware. This method
has some flexibility but it is BIOS dependent.
Applications to hardware. This method is hardware
dependent and very inflexible, however, it is very fast,
very efficient, and it has no overhead.
Adding adapters to the system
When adapters are added to the system, an area in
memory has to be allocated to run its programs. This can
be done with either hardware switches or software
mapping.
If there is a conflict in software mapping:
The first device to attach to an IRQ, DMA, I/O
Address, or RAM location will probably function. The
second device will not be found.
Standalone diagnostics might function properly
because the device that was found is the only device
running.
Software configuration conflicts occur when:
Hardware is configured differently then the software
using it expects it to be.
Hardware memory address space is in conflict with
memory used by the application software.
System resource conflicts
System failures occur when there are system resource
conflicts with the:
Interrupt Request Queue (IRQ)
Direct Memory Access (DMA)
I/O Address
ROM and RAM Addresses
IRQ:
Assigns a unique interrupt request line to every I/O
device (line numbers range from 0 to 15).
Interrupts the processor to force it to service the
request.
Handles interrupts on a priority basis (low numbers
have the highest priority).
Queues interrupt request.
446
IBM PC 300/IntelliStation/Aptiva Vol 2 HMM
Содержание Aptiva
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Страница 72: ...Input Output connectors 1 1 2 2 62 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 74: ...Front bezel EMC shield 64 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 87: ...System board layout 321 31 PC 300 6268 6278 6288 6338 Aptiva 2173 77 ...
Страница 123: ...Notes PC 300 6268 6278 6288 6338 Aptiva 2173 113 ...
Страница 127: ...Parts Type 6288 6338 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PC 300 6268 6278 6288 6338 Aptiva 2173 117 ...
Страница 180: ...Front bezel EMC shield 170 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 186: ...System board layout 176 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 228: ...Notes 218 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 229: ...Parts Type 6563 6593 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PC 300 6563 6593 6564 6574 Aptiva 2178 2198 219 ...
Страница 242: ...232 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 245: ...Parts listing 315 Special tools 318 PC 300 6565 6566 235 ...
Страница 289: ...System board layout 12345678 OFF OFF 1234 PC 300 6565 6566 279 ...
Страница 323: ...Notes PC 300 6565 6566 313 ...
Страница 324: ...Parts Type 6565 6566 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 314 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
Страница 373: ...Bezel removal Top drive cage removal IntelliStation 6868 6878 363 ...
Страница 377: ...System board layout 123 123 33 34 32 35 31 37 36 IntelliStation 6868 6878 367 ...
Страница 412: ...Notes 402 IBM PC 300 IntelliStation Aptiva Vol 2 HMM ...
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Страница 464: ...IBM Part Number 09N8610 Printed in U S A S N 4 19 2 ...