[Coco] Changeing Forground Colors in DECB

[rietveld rietveld]

I just wrote this small program to better explain how 'COLOR' works

10 FOR A = 0 TO 9
20 IF A=9 THEN RUN
30 SCREEN 1
40 COLOR A,A
50 GOSUB 80
60 PCLS
70 NEXT A
80 FOR R=1 TO 30
90 CIRCLE(128,96),R,A
100 NEXT R
110 RETURN

'RUN' this program

Now change LINE 40 to read:

40 COLOR A

And watch the difference

Now change LINE 40 to read:

40 COLOR , A

And compare the difference again

Hopefully this visually explains it


Sent from my BlackBerry 10 smartphone.
  Original Message
From: coco at jechar.ca
Sent: Monday, August 6, 2018 8:45 AM
To: Coco List
Reply To: CoCoList for Color Computer Enthusiasts
Subject: [Coco] Changeing Forground Colors in DECB


  Hi I am runing a Coco3 with a composite monitor.
  CLS N
  Works just fine for changeing the background color

  According to "TRS=80 Color Computer Quick Reference Guide"
  the command
  COLOR forground,background
  should be able
  to change my forground color but it does not work on my coco3.

  No syntax error but it does nothing.

  Charles

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