[Coco] Preventing cursor blink at very high clock speeds on a Coco

[rietveld rietveld]

When I use 80 column mode I do a :

POKE &HF787,198:POKE &HF788,1

This creates a solid cursor (under line).

Sent from my BlackBerry
  Original Message
From: Robert Gault
Sent: Thursday, January 24, 2019 7:22 PM
To: CoCoList for Color Computer Enthusiasts
Reply To: CoCoList for Color Computer Enthusiasts
Subject: [Coco] Preventing cursor blink at very high clock speeds on a Coco


I've become aware that some people are running Coco emulation at very high clock speeds. This is
easy with VCC and MESS. It may also be possible with new hardware such as the CocoFPGA.

Well at 18+ MHz the cursor blinking is giving some people fits. :) Here is a way to turn off cursor
blinking with a Coco3.

Write and LOADM the following:
        org     $f77e
        fcb     $21     brn     prevent blinking in Width 40 & 80 modes

        org     $a1a5
        fdb     $1212   nop     prevent blinking in Width 32 mode

        end

With a Coco 1 or 2, you will need to change your ROM as these don't run in all RAM mode. All version
of the Basic ROM can be altered at $A1A5-$A1A6 by changing the $8B10 to $1212.

Robert

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