Appendix B
Display Systems
B-9
Command Code
Function
Set
Request or
Reply
Parameter(s)
“Set” and “Reply” msg.”
Description (”set” function)
Diagnostic:
Internal Test Pattern
$7F
$FF
P1: 7 (test ptn.)
P2: Various:
0 = external video
7 = black
19 = dots in xhatch
20 = dots only
21 = gray scale
17 = white field
22 = dbl. xhatch
23 = xhatch
Run a diagnostic, such as “Test Pattern”.
P1 = $07 (runs the “Test Pattern” diagnostic).
In Replies to “set” command:
7 0 = OK
7 1 = pattern not available
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