[Coco] How register $FF9B works

[jdaggett at gate.net]

Paul

Did you type the program as shown in the email? If so there is a few 
errors.

first one I see is 

25 WIDTH 40
15 WIDTH 40?


30 FOR I=3 TO 0 STTEP -1
30 FOR I=3 TO 0 STEP -1?

james

On 5 Mar 2004 at 13:00, Paul T. Barton wrote:

Date sent:      	Fri, 5 Mar 2004 13:00:32 -0800 (PST)
From:           	"Paul T. Barton" <idezilla at yahoo.com>
Subject:        	[Coco] How register $FF9B works
To:             	coco at maltedmedia.com
Send reply to:  	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
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> 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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