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Is there a Dragon version of Blitz? That is a game where you have to bomb the skyscrapers from an aeroplane, as it gets progressively lower and then either crash into a building, or land? There have been a few versions of this game written for the Dragon. Try the attached Air Assault. And what abou...

Commodore wrote:Is there a version of Tetris for the Dragon?

There are at least two versions available for the Dragon.

viewtopic.php?f=4&t=58&p=443#p443

I agree with Tormod.

We all have found programs / games that refuse to work properly when disks are attached. The same will happen with DriveWire if you have the Dragon Data or any other controller working at the same time you are connected to DW4 and load one of those games ... I will look in my files, I am sure there...

More detailed information by Norm Barson (copied from COCO FRIENDS DISK MAGAZINE Issue #27 ). RANDOMIZATION ON THE COCO Norm Barson Rick's program RANDOMWN in Issue 24 gave me the idea of writing a brief article on how random num- bers can be generated and used on the CoCo (1,2,3). The function RND ...

Be aware that using the SYNC instruction will slow things down considerably if you intend calling the keyboard routine frequently from your main loop. Although my previous method of using a countdown does not completely eliminate the flicker, it will have very little impact on the running speed of y...

I've looked at GraphText a bit more closely. It achieves the flicker free result by patching BASIC everywhere the keyboard will be read. It redirects the INKEY$ function, 016A "input char from DEVN", 017F "check break/pause" and 019A "get command". Then what it does is simply SYNC before calling th...

admin wrote:Main site now all updated - still need to sort out a few 3rd party extensions..

Thanks, Simon.

It doesn't seem possible to stop the flickering completely, but I have managed to reduce it to an absolute minimum by adding a subroutine (INKEY) which uses a combination of flag detect and a countdown to prevent the keyboard routine from being called every time. Edit: Just noticed something subtle:...

Just to add my own observations: It's possible to get a stable split screen in xroar using both hsync and vsync interrupts if the interrupted code doesn't read locations $ff00 and $ff02, which clear the hsync and vsync flags. It's easy to verify this just by running a loop of instructions instead o...