3.10Peripheral3DiagnosticPrograms
45
3.8 Video
Thistestitemteststhevideoby:
1.displayingthefiguresindifferentgraphicmodes.
2.displayingthepropertyandcolorofthecharactersindifferenttextmodes.
Userwillconfirmwhethereachvideomodeworksnormallybyjudgingwhetherthedisplay
iscorrect.Itcheckswhetherthevideomemoryworksnormallybywritingdataintothevideo
memory,thenreadingitoutandcomparingthetwovalue.
Subtest01 TextMode
1.CharacterTest
Teststwotypesoffontpatterns.
Font9*14
Font9*16
Itrequirestheusertocheckwhetherallcharactersofeachfonttypedisplayed
correctlybyansweringthequestionspromptedonscreen.Itwillbedisplayedas
follows:.
2.TextAttribute
Thistestitemistocheckwhetherthetextattributeofnormal,hi-intensity,
inverse,andblinkinginVGAtextmodecouldbecorrectlydisplayedonthe
screen.