VDC Display Systems MARQUEE 8521 Ultra Green User Manual page 72

Command Code
Function
Request or
Set
Reply
Diagnostic: $7F
Internal Test Pattern
Display Systems
Parameter(s)
"Set" and "Reply" msg."
$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
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Description ("set" function)
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
Appendix B
B-9