I’ve been very busy at work recently so have been unable to fiddle much with my broken Spectrum; it’s very much a lunchtime activity but unfortunately my lunchtimes have been non-existent recently. However, I have been fiddling around writing some Z80 for my own pleasure and have posted the source online today for your amusement. I’m perfectly happy for you to use this code or this with or without modification; a little acknowledgement would be nice, …
Well, I’ve finally dusted off my Z80 programming skills and after a little refresher course with the University of Internet I’ve developed this sprite demo. Most of the concepts here are not new; they are how I wrote games back in the day. The sprite routine is basic; it does not mask, but it is using pre-shifted sprites and running within a vertical interrupt routine. The red border, by the way, indicates how much raster …
A sprite is no good unless it can do something; and to be honest a game is no good unless you write it in a structured way. This is the way I used to handle in-game sprite logic; it’s probably not too dissimilar to the way that other games programmers did it. The trick is to have a small block of memory, say 16 bytes, that can be used to store sprite data, such as it’s …