SpritesMind.Net

The SH2/VDP1/VDP2/SCU clocks are generated by a PLL (IC20), which uses 14.318MHz * 2 = 28.6 MHz in 352px mode. In 320px mode, it runs the frequency through a 1708/1820 divider to get 26.8MHz. SCU DSP runs at half of that. In PAL units it uses a 17,734 MHz crystal and it is run through a 910/1135 div...

awye wrote: ↑

Mon Sep 03, 2018 9:23 am

Nemesis wrote: ↑

Wed Aug 29, 2018 12:09 am

So, anything else?

Master System support possible?

This is actually a good question, since the Megadrive VDP has almost all the SMS functions, and Exodus is supposed to emulate the VDP perfectly.

If I may say, it is great to have you back developing stuff. The projects you are handling are all truly one of a kind in how advanced they are, and it is great to see them progressing even if I personally can't make any use of them.

Nemesis wrote: ↑

Wed Aug 29, 2018 12:09 am

So, anything else?

Yeah, Saturn emulation

Actually... if the VDP1 is shrinking a texture, and there are transparent and opaque texels "overlapping" in a given place, does the opaque texel always get drawn? (i.e. does it write to the same pixel on the framebuffer multiple times within a line?) I think it is different in each mode. With Scal...

When reading doc and forums, I understand VDP1 will adapt texture to polygon. It polygon is 32x32 and texture 64x64, I understand will shrink texture to 32x32 and then change shape to adapt to polygon shape. But you wrote that will "show only 32x32 and then waste time checking pixels that don't end...

You'd need to do quite some magic to "defragment" your sprite table in a way like that, although I suppose it is possible, especially if you use very large sprites. But I don't think it's practical because for animation-heavy games, the VRAM is not enough and you need to load new sprites from low ra...

End codes are just Sega's idea of speed optimization. They tell the VDP1 to stop sampling the texture, so if large parts of the texture are transparent, you can get a potentially significant speedup at drawing.

Though after working on some software polygon routines meant to draw Saturn-like quads I'm left baffled as to why it needs to go through all pixels (is bresenham-like interpolation that hard to do in hardware? serious question), not sure what it's doing internally on that respect. It goes through e...

I don't know if you get overdrawn pixels when you draw a poly where the right side is larger.... logic would dictate that you get dropouts here, but the VDP1 does some aliasing to get around this, but I don't know how. Whenever the line would step diagonally in its slope it draws two pixels (on bot...

- VPD1 and VPD2: VPD1 writes in framebuffer. VPD2 reads this framebuffer and copy all this info to one of its layers. Then mix all layers and send result to TV: If this is true, then all "sprites" are in one layer. This seems usual way. The Video Panda 1 draws one frame to its framebuffer 0, while ...

If you are on Windows, CD Manipulator can make clonecd compatible dumps with subcode included, and it is free:
http://www.storeroom.info/cdm/

It will write a "cdm" file instead of "ccd" but the format is the same, and it can be renamed and work the same.

Very nice video!

Do we have board photos of the Sega interface card? The longer one in your video (not the SNASM one).

There's a few menu screens on the SNES that use interlace mode, but it's pointless. Progressive fonts are perfectly legible too. Yeah but on the SNES you are heavily limited in colours and background layers if you use the interlaced mode. On the Megadrive you are pretty much only limited by whether...

BIOS of teradrive : http://piroxilin.narod.ru/sega/teradrive/bios-27c010.bin And here I was hoping I was gonna get some work stuff done. There goes the day... EDIT: oh, it's the PC BIOS. I wonder if it includes any Tera Drive specific code or not. EDIT 2: by the way before I forget, looks like this...