Archive for the ‘Programming’ Category

WannaClone (C64 and Atari 8-bit)

Tuesday, June 20th, 2017

Two releases for the price of one this time, although they’re built on the same block of scroller code. WannaCrypt for the C64 and Atari 8-bit is a teensy demo with a loose copy of the WannaCrypt decryption tool and a scrolling message which is, due to a discussion about simple encryption at the Atari Age forums, reversibly mangled using a couple of simple techniques. Here’s the C64 version which features an old but still golden tune composed by Marc “Skywave” Francois…

…and this is what it looks like on the Atari 8-bit with graphical help from José Pereira and accompanied by Miker on the POKEY. There are even vertical colour splits being used on this one!

The source code for both the C64 and Atari 8-bit versions are available at GitHub, although they don’t come with the painfully hacky BlitzMax tool which takes some text and creates a mashed up binary file.

Workprint – June 2017

Tuesday, June 13th, 2017

There hasn’t been a lot of coding time for one reason or another recently, but one thing I’ve been tinkering with a little is the SuperCPU or more accurately an emulated version courtesy of VICE; I’ve reworked my unrolled plotter – the one used in MD201704 – to handle about four hundred points. There’s also a “user interface” so that the cosine curves can be fiddled with as well because that seemed like a fun thing to do.

Halfway through playing with it I realised that, since it’s 6502 code rather than 65816, there’s no reason it won’t work on my Turbo Chameleon-equipped machine as well… where the 6MHz mode takes longer to get all of those points cleared, updated and drawn whilst the “unlimited” mode actually gets job done faster than the SuperCPU! Since I can at least release it as tested on one real accelerator and possibly get someone to run it on a SuperCPU as well, this may well become MD201706 and there should be enough raster time to finally use Sean’s double speed cover of Brian The Lion without breaking a virtual sweat.

There’s also a C64CD demo being prodded at right now, quite literally in fact since it’s testing on my C64C as I write. Unlike previous releases on said label it isn’t inspired by classic 1980s or 1990s releases and instead has a loose theme based on current events and a discussion at the Atari Age forums which got onto the subject of encryption. It needs a little more work, but should be ready to go either tomorrow or possibly Thursday.

MD201705 (C64)

Wednesday, May 31st, 2017

There’s no theme to MD201705 so I can’t mumble about that for this post, but it does rework an effect I did previously in the demo Mish Mash, covering a larger area of the screen and updating the colour RAM this time as well as adding some more cosine curves for good measure.

It’s available to download from the usual suspects and the source code is available from Github too. There’s no YouTube video at the time of writing but I’m in the process of rethinking how to do those for better results.