SpritesMind.Net

Did you declare pb as volatile?

PALs are long gone, because the three main types of GALs can do anything most PALs can, and they use flash to store the matrix. PEELs are similar to GALs, but much less common in scrap equipment. GALs/PEELs are also the most complex PLDs which have freely available open documentation.

You can use any of the three ports as either serial (up to 4800 baud, with a TTL interface) or parallel. I've used the rear port along with a version of Macsbug that I hacked up from the oldest Macintosh version I could find. Zero Tolerance uses a parallel mode. You can also do wierd stuff, like the...

CLR, BTST and some other instructions cannot be used with VDP :) That is correct. CLR is a read/modify/write instruction just like AND and OR, even though it ignores the read value. I learned this years ago when working on a boot rom for a 68000 system that used parity RAM. This was in the initial ...

I suppose if you really want to halt the 68K, just have it read an address space that doesn't provide DTACK.

But on an emulator or on hardware modified to provide BERR it probably won't work.

Fixed. For whatever reason the directory I found it in had 700 permissions on everything, and that got copied over.

Nemesis wrote:Only the v1.02 of the Pionner LaserActiv bios is dumped. I know there is a v1.04

http://sega.fanboy.net/files/laseractive-bios-1.04.zip

I don't remember whether that's the one from my own Laseractive or not, but my Laseractive has a socketed EPROM for its BIOS, so I dumped it long ago.

If you really want to calculate the checksum, why stop everything else to do it?

Have the checksum run incrementally as the game and title screens run, or in the vblank, then do whatever you want when it finishes and finds the wrong checksum.

I would rather do a sidecar board on the expansion connector. Genuine Sega units are easier to find and should be easier to work with than a geniclone. And for a dev board, I think I'd rather have an ethernet port, though SD or MMC would probably be a bit easier to program than ethernet. It's just t...

You can buy a PCI addon card with LPT port. That works fine if all you want to do is talk to a printer. Most stuff that does bit-banging on the parallel ports wants to talk directly to the interface chip, and has problems with PCI LPT cards because they don't use the "standard" port addresses. You ...

Pascal wrote:thanks, i was able to recompile it, if i remove all the command line parsing stuff.

i gonna work on a SN syntax, compatibility

... or you could find source for getopt() ? It can't be that hard.

I'm just asking a little question: is there going to be a Mac OS X port of Regen in the future? I like Mac OS X very much and would love to use Regen on there, as the emulators available (except for MacGens, non-native, requires X11, and crashes very often) are all monopolized by some Richard Banni...

It's an issue with all compilers. They expect the values to be initialized before calling main(). It's all in how you set up the linkage. For a binary that loads into an operating system, you want the initialized segment to load right into memory along with the code. For ROM code, you need two thin...

A fully endorse. However, breakpoint for access at address will be more useful than breakpoint on PC. Very ask this. For example, if breakpoint to access to memory $FF0001, a0=$FF0000, then the opcode move.l d1,$0001(a0) will breakpoint cause. Well, and so forth. Actually both break on PC address a...

Eke wrote:PS: what is address wrapping ?

I would presume that's when you have, say, a 256Kbyte ROM, and access space outside that ROM. You will find that the entire 4 megabyte space will be identical copies of that same 256K of ROM because the higher address lines are ignored in the cartridge hardware.