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Showing posts from September, 2019

Opening Top and Bottom Borders on the Commodore 64

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Opening up the top and bottom border is of course a trick any seasoned C64 demo writer knows. But anyone who started with BASIC before switching to 6510 probably remembers how much fun it was to get that extra space for sprites and even some simple graphics. 
The program below shows how to do this. Set up a raster interrupt right before the bottom border start. Then toggle between 24 and 25 lines of text. This tricks the VIC into forgetting to turn on the border. The opened border can be used to display sprites. By manipulating the last address of the VIC page ($3fff by default), you can even get some interesting graphics. For example, Pasi Ojala posted an article Opening the Borders with some truly amazing effects! 
Of course, opening up the side borders is the next challenge!



; little demo to open up the top/bottom border ; for win2c64 by Aart Bik ; https://www.aartbik.com/ scroly   =   $d011 raster   =   $d012 vicirq   =   $d019 irqmsk   =   $d01a ciaicr   =   $dc0d ci2icr   =   $…

Dronies

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What do you do when you suddenly have two functional, flying drones again (a Phantom 2 vision+ and a Mavic Pro)? You fly one, of course, and ask your daughter to fly the other one. Then you take "dronies"!


How Much Land Does a Man Need?

While updating links on my website to content that I also maintain, I had to think of a variant on the title of Tolstoy's brilliant short story: How much Internet Presence does a man need? Donald Knuth writes that he has been a happy man since 1990, when he no longer had an email address. Would the same apply to webpages? I am not ready to find out yet!
https://www.aartbik.com/ https://aartbik.blogspot.com/ https://twitter.com/AartBik https://facebook.com/ajcbik https://www.youtube.com/user/AartBik https://www.linkedin.com/in/aartbik https://amazon.com/author/aartbik https://github.com/aartbik https://play.google.com/store/apps/developer?id=Aart+Bik