SpritesMind.Net

RivetRetro wrote: ↑

Thu Oct 01, 2020 6:08 am

I have no idea what it's referencing with 0-FF:

Both 68k read exception start address from the 8-255 first bytes memory address. Every 4bytes is a direct jump exception address.

Remember that when there is no cartridge the first two 4MB of address space on MD get swapped.

Nice to see a proper puzzle game, I’m so glad!

Last time I tried a puzzle game was like:”1 2, now solve it” (I think you can do it better than that), and I was not really in the mood for new puzzles, but thanks to you I’m back in the game, literally.

If registers are only accessed from the BIOS that solves the problem.

@Chilly Willy are you saying that MCD doesn’t put the 68K bus in high impedance when hasn't taken the MD-68K bus?

If signals like, for example, !TIME have a definitive impact in the address decoding of the MCD, I think they should be considered part of the address lines.

@cloudstrifer: The sprites you show on the image are leftovers from past use, and innocuous since they are not linked in the list (“Link” field).

No, I was saying that I thought not possible to have both the 32X and the SCD/MCD working from the cartridge slot at the same time, the MCD being emulated by the everdrive cart and a real 32X. So you have to choose between 32X or MCD, and no 32X-MCD combo. Am I wrong? The problem is that the 32X com...

Both 32X and MCD working from the cartridge port...? I thought that was not possible...

Hi KRIKzz, curiosity just spike up a lot with you messages, what is your project about? Perhaps a MegaCD/SegaCD in a FPGA? Just curious...

Also:
Working on 1:2 resolution is weird for graphical artist, or anyone else, I have never seen do it. Pixels are not square any more.
Doubled resolution is done by interlacing images (on different lines), not sure of the result quality on 90’s phosphor tv’s.

You need twice the memory for tiles, backgrounds and sprites alike, and there is no much to start with if you use all the others planes. So it’s a case between resolutions vs diversity, where variety is already somewhat scarce. On lots of design questions memory is the underlying factor, today as ev...

As far as I know that can’t be done: the problem is that symbols '/' and '-' are interpreted as division and minus.

Very true - the C preprocessor can be run on gas files (use .S instead of .s for automatically doing so). Pragmas and defines and stuff can be used. This does make a gas assembler specific file very flexible compared to more traditional assemblers. I didn't know! investigation about to lunch. Defin...

After doing asm on several platforms I have to recommend gcc/gas. Why? Because macros are quite powerful, not perfect, but good enough to make extend programing simpler than others. (I know I touched a sensitive point, waiting for massive angry replies… ;) ) And to be honest GAS is probably the wors...

Set the exception to jump to ram, there jump again to the desired h-int routine, you can use an absolute word jump, then wrote your routine in asm. It’s important to only push/pop the registers you’re going to use if you are cpu constrained; also there is the user stack pointer (usp) so you can swap...

Let’s first agree on what’s the situation: as I understand you have a map, a 2D matrix, where each element is a metatile of 5x5 tiles. Is that correct? Something like this: struct Tile { int indexOfTileOnVRAM; int colisionResponseIndex; }; struct Metatile { Tile tiles[ 5 ][ 5 ]; }; const Metatile me...