SpritesMind.Net

ok, let's try it again, I think I read it to fast last time. if you are reffering to to an address like $FFFFFFFF , doesn’t the $ state that it is the value stored at the address $FFFFFFFF ? Not exactly, the '$' means exactly the same as "0x" on a C/C++ compiler, it just entails that the following n...

How you manage the cartridge address space is a hardware question, software is only involved when accessing it from the cpu.

Do you want a code sample? there is one:

u16* p = <whatever_address>;
*p = 0x1234;

A cartridge can only manage its own 4MB of address space and the !time signal.

Taking ownership of an exception and execute a program is my first thought.

I believe Everdrive does save states... some spying work there maybe...

Usually when there is bank switching, there is a part of the mapped rom that never switches to avoid the problems you described.

The trick is to create sections within gcc, check documentation.

First be sure to check if that if physically possible. Then check if this configuration can work with your program/game running on.

Perhaps you should think to build a separate tool which handles all this. So in you program when the character reaches certain line it knows exactly which tiles and meta-tiles to update. Regarding 8 directions scrolling, having up/down scroll not necessarily means any tile update. In Megadrive you c...

"PC=200" ? That sounds like an exception. Notice that A6 is an odd address in the rom hack.

Al you said points to an misaligned address.

The ($FFFFF600).w means to pack the value in a word (16 bits) instead of a long (32bits), which -depending on the compiler- it will do by default. It works because this cpu will always do sign extension while expanding address.

Edit: My mistake (thanks guardian angel)

(Sorry but people is throwing objects to my house, firecrackers it seems by the amount of damage: deleting messages)

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wow! there is a huge difference in tech on those consoles, you can reuse pretty much nothing...

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?