Ibm A40 TYPE 6840 Manual de usuario descargar pdf (Pagina 139)

ROM and RAM Addresses

Adapter cards with processors can contain RAM and ROM. If the adapter cards

have onboard memory, then the following are true.

v ROM contains operating instructions for the adapter I/O.

v RAM is used for buffering.

Two adapters using the same memory area will cause a failure. This failure might

appear as a hardware failure.

The IRQ levels, DMA channels, I/O address, and ROM and RAM addresses all

become potential conflicts and system problems. When conflicts arise, they might

show up as system hangs, lost or missing devices, incorrect or bad data, or failing

diagnostics. Always eliminate conflicts in these areas before replacing any

hardware components.

Chapter 10. Related Service Information 133

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Ibm A40 TYPE 6840 Manual de usuario Pagina 139