NCR NCR 5972 Manual

A SERVICE OF

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Chapter 3: Installation 3-5

Diagnostics

The5972CustomerDisplayhasinternalPowerUpDiagnosticsthat

occursoonafterpower‐uporifaResetDisplaycommandisreceived

fromthehostsoftware.

Whenthehardwareispowereddown,allregistersandmemoryare

lost.Norecoveryispossible.

ThePowerUpDiagnosticsincludethefollowingtests:



• Micro‐controllertest

• ExternalcharacterPROMtest(VFDonly)

• PixelNumberDisplay

Micro-controller Test

Forserialcommunications,theCTSlineissetinaMarkingcondition

(negativevoltage)atthestartofthetest.ForVFDparallel

communications,theBusylineissetactiveatthestartofthetest.The

firsttestistheMicro‐controllertestwhichchecksoperationatthe

Micro‐controller.



Ifanerrorisdiscovered,testinghalts,andthefirmwarebegins

executingaforeverdonothingloop.Noresponseissenttothehost.If

theMicro‐controllerTestpasses,theCTSandBusylineexception

conditionsarelifted.

External Memory Test Character (VFD Only)

AseparatetestisperformedontheexternalcharacterPROM,ifit

exists.ThePROMstatusisnotedandsavedforterminalretrievallater

usingtheResetcommand.

Ifanerrorisdiscovered,allcharactersetsstoredinthePROMare

consideredinvalid,andanycommandreceivedattemptingtoswitchto



oneofthesecharactersetsistreatedasaninvalidcommandand

ignored.