Specifications

14.2

Initialize

Diagnostic Data

14.3

ROM Checksum

Verification

14.4

Scratch RAM

Test

This option clears all previous diagnostic test results from memory.

The ROM checksum test calculates and displays a checksum to test

the integrity of the system software EPROMs.

This test checks the integrity of the scratch RAM area by writing and

reading words in memory. The test works by writing a known pattern,

“55AA” into memory and then reading the area of memory back. The

system then writes and reads a second known pattern,

“AA%.”

This

algorithm checks every byte in the the scratch RAM area. If an error

occurs, the system displays a message stating that the test failed.

Scratch RAM is considered the working area of memory for the

DXP’s microprocessor. This area of memory is “volatile,” which

means that any data in this area is lost when the system loses power.

This test checks the integrity of the NOV-RAM area of memory. The

14.5

NOV-RAM area of memory is write protected and backed up by super

Non

vo/ati/e

capacitors on the DXP’s RAM memory board. The programmed

database and

SMDRs

are stored in this area of memory. This test uses

RAM test

the same write/read algorithm as the scratch RAM employs.

2 Diagnostics