The Silent Demo

by MSX Resource Center on 17-12-2011, 10:59

This is the first MSX 2 demo of the group RoboSoft Inc. and was released in 1990. It contains a number of effects like rastersplits, line-interrupts, several scrolls, etc...

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The Silent Demo30.85 KB9222 days 5 hours ago

Comments (4)

By shadow_knight

Supporter (1)

shadow_knight's picture

29-07-2009, 23:59

It has been a long time ago when I did write this demo. As far as I know this demo was the first ever to have a color rainbow based on raster-interrupts and some other neat effects. The large scroller for example is done on one of the text screens. The effect is performed by continuously updating the font table.

It was quite difficult to get the vertical and horizontal interrupts working. Especially since all available documentation at that time did not describe the registers of the VPU. Or if they did, it was wrong. But I found the correct settings. And I had to really count the length of the assembly instruction in clockticks, because MSX is just so slow. Especially the I/O ports to program the VPU are expensive in CPU ticks. It is easy to make a split screen, it is something completely different to program a new color value in one of the registers at *every* rasterline!

The demo would be nicer with music, but I simply could not find the needed CPU time to handle the music.

Nice to see that are all that time the demo is still available!

- Shadow Knight (SHK)

By BlueCrystal

Expert (105)

BlueCrystal's picture

07-08-2012, 21:53

I am getting an empty .dsk file from this download. Can anyone confirm this?

By wolf_

Ambassador_ (10109)

wolf_'s picture

07-08-2012, 22:00

I get a demo with red, white and blue color bars (and some wacky sprite on top of the screen, I think). More parts too.

By Robosoft

Expert (110)

Robosoft's picture

11-08-2012, 18:20

The disk looks empty because it uses a sector loader. Best results on a real msx computer... Tongue