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I don't know for sure. For now I am keeping the code as simple as I can. the idea is to get it working and then look at performance after. I have an array of structs that let me track each invader's location in the tile space as well as the location in pixel space. The pixel space is so that I can k...

Assuming z88dk does the right thing of course.

For powers of 2 mod is the same as logical and. So cheap as chips mate.
Is the same as:
And yes, it took a long time to figure out.

Today I learned. if ((pixels & set_bit_mask[bulletx % 8]) == 0) { return false; } is not the same as if ( pixels & set_bit_mask[bulletx % 8] == 0) { return false; } So now I have bullets hitting aliens with pixel level accuracy. Shields go through 3 stages of damage. I just need to work on t...

So in the interests of actually releasing something this century, I have gone back to C and NABU-LIB. Turns out, I am really not much good at z80 assembly. 6502 Assembly is so much easier with much nicer addressing modes. Even if I one needs to use the zero page for 16 bit variables. Here is a littl...

https://github.com/linuxplayground/nabu-games/releases/tag/v3.4 This release adds some minor performance improvements by printing text to the framebuffer rather than directly to the VDP. This means the whole screen in Tetris is updated at the same time. This avoids occasional glitches caused by VDP ...

This is what I do. But I host the files on my GitHub so folks can pull them down from there. DJ kindly includes the files on the IA and in cloud cpm. To make it easy, I ship both versions. The native nabu and the cpm version.

https://github.com/linuxplayground/nabu ... s/tag/v3.4

I did have some issues with that. I found on my system plugging it into one of the usb3 sockets seems to be most stable. But, I only had it in there long enough to program it. I've not tried any dev yet.

I know that many of you are looking forward to a space invaders clone on the Nabu. I am working on it, but it's slow going. I am writing this game in raw Z80 assembly. My main reason for doing so is speed. I am not convinced of the z88dk compiler ability to generate really fast code. ( I am also not...

Sweet!