IBM PCjr Manual page 193

Your screen should be filled with
zeros (O's).
MODOOCOOOOOOMO
lOODODoixioaiiei
MOMOOOCOeOCOOD
OOOMOOOOOOOOOOOOOO
OODCOOtlOOOOOeOOOOOO
OACCOODODsaooueooeti
ooocuoooQoaocoeoooo
ouoooooooooDOOoeooaooDooooo
AOAOOOAOaaaOAOOfiOOODeOOOAADOAfl
AROOCOAOOODBOOOOOOOAeOOAOOOODOAAOO
••-OOOOOOOOOO0OOBOOBOOOBOOOOOOOOOO
AOOOOOOOaooaaoOSflOOOSOOOOOODOAAOOOOAO
AAAOOOAOCDOOaOAOOOAO
OAOAAOOOCOOOOOAAOdAO
AAAAflOOOASOOaoDOOOAO
AOAAOAOOAOOOflOAOAODC
AOOOOOOOOOOOOAO
AOOOAAAOOOAUDADAOAOOflOOaOAOOOOOOA
OAOAOAOOOOAOOCOflOOOOOOOOeAOOOAAOO
OOOOAOOOOOOAAOOOOAOOeOOOOAOOOaoSA
AOOOOAOAOOAOOOOOOAOOOOOeOOOCOOOAO
AQeOAACOOOAAOOOOOOOCOOOOOOOOOOAOOaoOCOOOOASOOOAODOOOOOOOOOOOOAOOOOOOOOOOOOeOOOA
•••"^OOOOOOOCBOOOOOCOOOOOOOOOOOOOOOOODOCOOOOOOAOPOAOOBOOflOACOOOOOOOOBOOOOOf
lOflOOOBOOOBBOBOBAAOOBOBBflflBBOBOBBOOBfl
Press
(1
Another screen appears. Continue
to press the Insert key, each time
displaying the next screen, until you
reach a screen filled with sevens (7).
Did you reach the screen filled with
sevens?
YES
NO
Press
and go to Step 8.
Have your IBM PCy>
serviced. See "Service
Information" in this
section.
Television and 40CD Test 6-51