Search found 261 matches

by TascoDLX
Sat Jan 04, 2014 1:04 pm
Forum: Mega/SegaCD
Topic: Testing boot from CARTRIDGE SLOT at 0x400000
Replies: 14
Views: 13618

This should give you a quick insight of where the boot check code is on each bios. After this detection is done, the next thing the BIOS do at that region is attempt detection "RAM_CARTRIDG" string at $400010. All CD BIOSes seem to do this regardless of region. Ah yes, I think I remember RAM_CARTRI...
by TascoDLX
Thu Nov 21, 2013 12:45 pm
Forum: Super 32X
Topic: Night Trap 32X video compression
Replies: 17
Views: 21985

Congrats! Source code release would be cool, I'd check that out. I might even look into decoding other SGA vid packets. Never really looked beyond Night Trap & Sewer Shark.
by TascoDLX
Wed Nov 20, 2013 2:40 am
Forum: Exodus
Topic: Problem with input
Replies: 6
Views: 7048

It's not very obvious, but you need to have the "Image" window selected right now in order for input to be captured. Just clicking on the menu will cause you to lose focus on the Image window, and input will no longer be captured by the emulator. I'd guess that's what's causing your problem. There ...
by TascoDLX
Fri Nov 15, 2013 5:53 am
Forum: Super 32X
Topic: Night Trap 32X video compression
Replies: 17
Views: 21985

Super cool! Thanks! I can't believe we (mostly you) were able cracked the code so quickly. No problem. To be fair, it could have been a lot more complicated if they decided to do more than just boost the colors of the Sega CD version. Luckily they settled for a relatively simple format, so it was p...
by TascoDLX
Wed Nov 13, 2013 6:46 am
Forum: Super 32X
Topic: Night Trap 32X video compression
Replies: 17
Views: 21985

Files: Night Trap 32X Video Codebook - 2013.11.12.txt NT32XVID-FIXED-OPS.PNG Opcode listing is at the end of the text doc -- pretty much all verified. PNG contains all the 2-color fixed patterns, some of which can be referred to by multiple opcodes (don't know how much of that is intentional). The c...
by TascoDLX
Tue Nov 12, 2013 7:08 am
Forum: Super 32X
Topic: Night Trap 32X video compression
Replies: 17
Views: 21985

This is great! I hope you're having fun working on this. I know my curiosity is piqued. :-) I suppose we could figure out all of the codes by disassembling the game code and finding the right routines, but it might actually be more interesting ths way. Oh definitely, this is very interesting. A lot...
by TascoDLX
Sun Nov 10, 2013 2:44 pm
Forum: Super 32X
Topic: Night Trap 32X video compression
Replies: 17
Views: 21985

Yeah I just change the data with a hex editor and run the ISO in Fusion. I pause sometime before the frame I want to see and take a bunch of screenshots. Fusion will automatically frame advance when you take a screenshot. That works for me. Question: What is the significance of the FF and the end of...
by TascoDLX
Sat Nov 09, 2013 12:02 pm
Forum: Super 32X
Topic: Night Trap 32X video compression
Replies: 17
Views: 21985

Re: Night Trap 32X video compression

I can get you going in the right direction. ;) If you look at the data of the second frame, you should be able to spot the palette data [0000 0420 0421 0841 ... 18C4], all in order, fits the format (sort of dark colors, explained by the fade-in). Count them: there's 11, or in hex, 0x0B. Check the he...
by TascoDLX
Fri Sep 13, 2013 8:33 am
Forum: Announcement
Topic: AtariAge gets cease & desist for Princess Rescue?
Replies: 17
Views: 17524

Yes, but this is also part of substantial similarity: "The court excludes all public domain elements from its analysis and looks only at those elements that are protectible." It has to be a protectable element FIRST, and THEN it must be substantially similar. I think it's more just Nintendo being a...
by TascoDLX
Thu Sep 12, 2013 11:50 am
Forum: Announcement
Topic: AtariAge gets cease & desist for Princess Rescue?
Replies: 17
Views: 17524

Here's the deal: In cases of trademark infringement, there's no burden to prove exact duplication of a company's intellectual property, as long as it looks strikingly similar. This is called substantial similarity . (To learn more about substantial similarity, read this article .) In such cases, the...
by TascoDLX
Tue Sep 10, 2013 2:09 pm
Forum: Megadrive/Genesis
Topic: Mickey Mania emulator comparison
Replies: 67
Views: 38394

The difference however is that, contrary to Mickey Mania, twhen there are preceding sprites on the same line (the "spinning" titan message), the amount of rendered sprite pixels does not hit the sprite "pixel" limit resulting from the display off period (~128 pixels according to TascoDLX tests, 144...
by TascoDLX
Mon Sep 02, 2013 2:32 am
Forum: Mega/SegaCD
Topic: Problems with running a .bin with MESS
Replies: 7
Views: 9303

Looks like something got changed in MESS v0.149. It works fine in v0.148u1, but the new version expects the ROM to be at least 8KB. Just pad it out with zeroes and it'll work fine.
by TascoDLX
Sun Sep 01, 2013 11:58 pm
Forum: Mega/SegaCD
Topic: Problems with running a .bin with MESS
Replies: 7
Views: 9303

By default, ASM68K tacks on a small header that throws everything out of whack.

Try this instead:

Code: Select all

asm68k.exe /p hello.asm,hello.bin
by TascoDLX
Thu Jun 27, 2013 10:51 pm
Forum: Megadrive/Genesis
Topic: Help figuring out some logic in Flicky - new challenge #3!
Replies: 19
Views: 11781

Should be simple enough to do. You'd have to figure out where the level data is stored in order to relocate those chicks, but the rest of it seems pretty trivial at this point.
by TascoDLX
Tue Jun 25, 2013 11:46 pm
Forum: Megadrive/Genesis
Topic: Help figuring out some logic in Flicky - new challenge #3!
Replies: 19
Views: 11781

Yeah it's really just using different table values. You only need to change a couple values to make it behave exactly like the arcade version in that respect. I guess it's a little awkward either way because of the loop around. Anyway, good luck on your high score attempts! Flicky is quite a challen...