[Coco] How register $FF9B works

[Paul T. Barton]

I'm trying to fix my last 64/32mb board
and have found some problems.

If I write a BASIC program to exercise
register $FF9B (bits 0..1) what should
I see on the screen?

So far I get a non-cleared snowy/garbage
video and border color change during
execution of:

10 RGB
25 WIDTH 40
20 R=&HFF9B
30 FOR I=3 TO 0 STTEP -1
40 POKE R,I
45 CLS(I)
50 FOR T=1 TO 500
55 NEXT T 'PAUSE SO I CAN SEE IT
60 NEXT I

Paul T Barton


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