Cause

Microprocessor register failure

Code

1-1-3

Cause

NVRAM

Code

1-1-4

Cause

ROM BIOS checksum failure

Code

1-2-1

Cause

Programmable interval timer

Code

1-2-2

Cause

DMA initialization failure

Code

1-2-3

Cause

DMA page register read/write failure

Code

1-3-1 through 2-4-4

Cause

DIMMs not being properly identified or used

Code

3-1-1

Cause

Slave DMA register failure

Code

3-1-2

Cause

Master DMA register failure

Code

3-1-3

Cause

Master interrupt mask register failure

Code

3-1-4

Cause

Slave interrupt mask register failure

Code

3-2-2

Cause

Interrupt vector loading failure

Code

3-2-4

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Dell 990 service manual Code Cause DMA page register read/write failure Through
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