SpritesMind.Net

Well that stuffs my plan. So, what is the best way to get data generated by the 68K into the SH2 RAM? I want to implement a ring buffer for passing messages, but if I do it with the frame buffer RAM I'll have to synchronize after every flip. Any suggestions?

Sorry if this question has been asked and answered - it isn't clear in any of the docs I have. Aside from the frame buffers, is there any region of RAM that is accessible to both the 68K and the SH2s on 32X?

Hi All, I'm trying to do a DMA fill on a non-contiguous chunk of VRAM by setting auto-increment to > 2. I have a rectangular set of tiles laid out top-to-bottom, left-to-right as a sprite would be. Within the rectangle, every 8 bytes is one row down. What I want to do is draw a vertical line through...

Jorge Nuno wrote:I'm not It's that I only do DMA copies in VBlank. And clearing register $81 should disable all kinds of DMA, unless there is some obscure bug.

I see. I saw

Jorge Nuno wrote: Well the code is started with a move #$2700 to sr, so that accidental dma is not started.

and was quite puzzled.

Well I though you were referring to Vblank DMAs, before the code inits properly. That's why the move to sr is right at the start. But now I'm doing a "MOVE.w #$8100, VDPControlport" after deactivating HBL/VBL. This should end with the accidental DMAs... I think you may be confusing DMA and interrup...

This is the case of matched headers, not real JPEG for sure. They open just fine in Paintshop Pro. The image size is small, but the files are about 7megs(!). I have no idea what all the extra data is or where it came from (the ROMs are at most 4 megs), but they do appear to be valid JPEGs. I wonder...

I used the same program to extract a large set of ROMs - almost complete. The extractor did find a lot of data, but a good chunk of it (~30%) isn't meaningful - perhaps the headers just matched the binary data by coincidence. There are some interesting things to note: The 'data in IFF' stuff all has...

One thing I haven't seen on a cart that would be nice is regular RAM. FlashROMs are okay, but with regular RAM you could make conversions of games that need more RAM than is available in the Genesis (like Doom). I'd like to see a cart with 4M of flash and 4M RAM (switchable) so that you can do cart...

That looks very nicely made. You made that yourself? If so, that's pretty impressive. Who manufactured the PCB for you? I see that the flash is on the back. What's the FRAM for? Also, I can see a USB-OTG connector on the top. Is this device programmed over USB, or do you have to plug it into a progr...

One of the sites I read a lot when I was learning about FPGAs is fpga4fun.com . It's geared towards the beginner and hobbyist. I got one of their dragon boards. It's a bit expensive given the size of the FPGA, but it's got a PCI interface, which is nice for building register-driven designs that don'...

Wow, that's excellent. I'm very interested in these kinds of projects. Unfortunately I don't have access to home-brew PCB making equipment right now and so can't attempt anything too ambitious. As for making peripherals accessible to the 68K, I would suggest using an FPGA to build a bridge between t...

Actually, it was a device to many tasks, emulation ROMs and dumping including. Sounds interesting. Here's a flash programmer/ROM dumper I made. http://img255.imageshack.us/img255/4659/pict0003ex0.th.jpg This uses USB. I'm not a fan of parallel port stuff because if you get something wrong, you can ...

As far as I know, the game gear was compatible with most SMS games (via Master Gear Converter), but not the other way around - game gear had some hardware that MS did not (deeper color palette, etc.). If the game was just the SMS code in a GG cart, then it might work, but if it was written specifica...

Using COM port based link is not clever. Even at 115k speed uploading 4MBytes is very long. Code is downloaded from the PC via parallel port... The device uses serial and parallel ports together, serial for control and parallel for data transfer. As I said, it seems to download at around 100K bytes...

Nice. How much did it cost you? As I mentioned, I picked up the PromICE for about $80 Canadian a while back. That plus a few cables, connectors and several hours of work got the job done. The ROM emulator is about 10 years old and would have been extremely expensive (100's or 1000's) when new. The ...