Search found 18 matches
- Thu Nov 23, 2023 3:48 am
- Forum: Super 32X
- Topic: State of RV Flag during Soft Reset
- Replies: 1
- Views: 19913
State of RV Flag during Soft Reset
Does the RV flag get reset on a soft reset or nah? I tried testing it myself, and it seems it doesn't. Keeping it set during a soft reset would not work out so well, since the internal vector table is still mapped and would cause the 68000 to jump to the 32X cartridge area, which isn't mapped due to...
- Thu Oct 27, 2022 5:13 pm
- Forum: Mega/SegaCD
- Topic: MCD manual claiming issues with PSG access from Z80
- Replies: 2
- Views: 5839
Re: MCD manual claiming issues with PSG access from Z80
Thanks. Damn MCD manual's weird wording/mistranslations...
- Wed Oct 26, 2022 7:53 pm
- Forum: Mega/SegaCD
- Topic: MCD manual claiming issues with PSG access from Z80
- Replies: 2
- Views: 5839
MCD manual claiming issues with PSG access from Z80
This is really confusing me. Would anyone here happen to know why the MCD manual states that the Z80 cannot access the PSG, let alone apparently anything related to the Genesis 68000 when the MCD is running? https://i.imgur.com/9vPOY51.png https://i.imgur.com/sqqEajy.png The only thing I can think o...
- Sun Sep 26, 2021 10:58 am
- Forum: Megadrive/Genesis
- Topic: Sega Virtua Processor Research
- Replies: 7
- Views: 16502
Re: Sega Virtua Processor Research
Necrobump! A while ago, I made a Python plugin for Blender that enabled SVP model support + a rendering engine. It's not fully complete, as I never figured out how it handled Z-sorting (there's some kind of flag for each polygon in the model data that messes with it), and the rendering engine is not...
- Fri Sep 24, 2021 9:32 pm
- Forum: Demos
- Topic: Yet another bloody Bad Apple!! demo for the Mega CD
- Replies: 0
- Views: 101561
Yet another bloody Bad Apple!! demo for the Mega CD
As mentioned in this thread , I have made my own Mega CD version of everyone's favorite 2hu video , Bad Apple!! May as well share it here, because why not. Unlike the Cinepak version that was released some time ago, this uses a custom made codec. It packs 4 256x224 1BPP frames into 1 4BPP frame, pla...
- Sun Oct 14, 2018 12:40 pm
- Forum: Mega/SegaCD
- Topic: ASIC Trace Table Question
- Replies: 5
- Views: 15534
Re: ASIC Trace Table Question
So, I've managed to get rotation to work, but I have one more problem: it's not centered. Right now, I have the start X and Ys use the standard rotation algorithm and I have the deltas be the cosine and sine of the angle. I am not sure how I would put centering into the equation. EDIT: Solved, I sub...
- Wed Apr 19, 2017 10:29 pm
- Forum: Mega/SegaCD
- Topic: Question about "Full Graphics Function"
- Replies: 2
- Views: 10764
Re: Question about "Full Graphics Function"
Ah, so it's as simple as that. Thanks!
- Sun Apr 16, 2017 5:04 pm
- Forum: Megadrive/Genesis
- Topic: 68000 programming optimization tips? (for speed)
- Replies: 28
- Views: 39745
Re: 68000 programming optimization tips? (for speed)
BigEvilCorporation: Basically, I've written a "fake layer" generator that takes 1 layer of art, shifts it a certain amount of pixels, then overlays it with another layer of art. It generates the data, then DMA's it to VRAM. I have received some help optimizing it, and while it's at the point where t...
- Sun Apr 16, 2017 2:33 pm
- Forum: Demos
- Topic: OVERDRIVE II
- Replies: 29
- Views: 48815
Re: OVERDRIVE II
The only emulator I got the ROM to load in was Genesis Plus GX (by changing the header to make it detect the ROM properly >:P), but as Jorge said, there were issues with it. Graphics glitch up and the music hanged after a while. (I was surprised to see the 3D segments (like full 3D) work perfectly, ...
- Sun Apr 16, 2017 2:29 pm
- Forum: Megadrive/Genesis
- Topic: 68000 programming optimization tips? (for speed)
- Replies: 28
- Views: 39745
68000 programming optimization tips? (for speed)
Title speaks for itself. I do know some basic 68000 speed optimizations, but I wonder what other kinds of optimizations I can make to really speed up my programs.
- Sat Apr 15, 2017 11:45 pm
- Forum: Demos
- Topic: OVERDRIVE II
- Replies: 29
- Views: 48815
Re: OVERDRIVE II
I saw it live, and all I have to say is... "fucking beautiful". Other than that, I am speechless.
- Mon Apr 03, 2017 3:24 pm
- Forum: Mega/SegaCD
- Topic: Question about "Full Graphics Function"
- Replies: 2
- Views: 10764
Question about "Full Graphics Function"
While reading through the documentation, I noticed there was a "Full Graphics Function" for the ASIC chip that allows you to input a bitmap from the MCD side and the MD side can read it as tiles, while in 1M/1M mode. I'm not quite sure how I could perform this. Is it just that you put in the data an...
- Tue Feb 07, 2017 4:32 pm
- Forum: Megadrive/Genesis
- Topic: Sega Virtua Processor Research
- Replies: 7
- Views: 16502
Re: Sega Virtua Processor Research
I was just using a Sonic 1 disassembly for a base to do it on (mainly because I was too lazy to make a basic homebrew base at the time XP), but I guess another reason is to show that I can implement this into a ROM that's not Virtua Racing.
- Mon Feb 06, 2017 5:40 pm
- Forum: Megadrive/Genesis
- Topic: Sega Virtua Processor Research
- Replies: 7
- Views: 16502
Re: Sega Virtua Processor Research
I have more info on how command 6 works with its camera and stuff for rendering art. The first model slot is the camera. In this slot, you can load the world map model. The second model slot is a normal model, but with 1 difference. The camera follows that model, so when you move that model, the cam...
- Sat Feb 04, 2017 1:25 am
- Forum: Megadrive/Genesis
- Topic: Sega Virtua Processor Research
- Replies: 7
- Views: 16502
Sega Virtua Processor Research
For the past few months, I've been digging through Virtua Racing to see how the Sega Virtua Processor works and how I could implement it into other ROMs. Reading this document: http://notaz.gp2x.de/docs/svpdoc.txt helped me understand how the DSP that the SVP runs on works. Reading that should help ...