Posts Tagged ‘monthly demo’

MD201706 (accelerated C64)

Friday, June 30th, 2017

Another release so soon? MD201706 is merely a plotter with some cosmetic niceness, but the code is a little unusual; it needs a SuperCPU (which can be emulated in recent versions of VICE and, unless it’s lying, it should run on either PAL or NTSC) or the Turbo Chameleon set to 6MHz or faster in order to run. Its single buffered and can clear, update and draw four hundred points a frame courtesy of the expansion hardware. It isn’t fully using the capacity of either device, the current firmware of Chameleon with its speed set to “no limit” is slightly faster than the SuperCPU but I restricted myself to 6MHz in case that top speed changes downwards with future updates.

A few people are probably going to ask “why” and the simple answer is “because”, but I’d actually been prodding around my unrolled plotter which was used in MD201704 on the C128, using 2MHz mode in the borders and found myself wondering just what my Turbo Chameleon could do with it. Then Wolf 3D for the SuperCPU arrived and I decided to make my code run with both. As always, GitHub is the source for… erm, the source and questions can be passed on in the usual manner.

This is probably going to be the end of season two for the Monthly Demo series because I want to take a little break to work on games… and yes, I’m already braced for the influx of responses that’ll probably get, so will be running away before this post goes out!

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.