Toshiba 400CS User Manual page 66

Subtest 06 640x200 Graphics Display (mode 6, E)
This subtest displays even dots, odd dots, and all dots in the 640x200 dot
graphics mode 6 and E as shown below:
To exit this subtest and return to the DISPLAY TEST menu, press Ctrl +
Break.
Subtest 07 640x350/480 Graphics Display (mode 10, 74, 12)
This subtest displays even dots, odd dots, and all dots in the 640x350 and
640x480 dot graphics mode 10, 74, 12 as shown below:
Pressing Enter changes the size of the displayed image. To exit this subtest
and return to the DISPLAY TEST menu, press Ctrl + Break.
400 Series
3-17