NCR 7454 - Page 156

6-8 Chapter 6: NCR 7454 4x20 Customer Display
Reset Display
Format: 1B01
Description: Thiscommandexecutesthepower‐downpower‐updiagnostic
sequence.TheBUSYlineissettoactivecondition.The micro ‐controller
testconsistsofasum‐checktestontheROMandawrite/readteston
theRAM.Afterexecutingthecommand,thedisplayscreeniscleared,

thecursormovestothe0position,theBUSYlineissettoinactive
conditions,andallregistersandvariablesareinitialized.Notethatthe
screenisclearedduringthiscommand.Ifahostneedspreviousdata
redisplayed,thehostmustresendthepreviousdataafterthis
commandhascompleted.
Erase Display
Format: 1B 02
Description: Thiscommandclearsallofthedisplayedcharactersbywritingaspace
toeachdisplayposition.Aspaceisdefinedascharacter0x20ofthe
currentcharacterset.Thecursormovestothe0position.
Invalid Command
Format: 1B 03
Description: Thisinnowaninvalidcommand.