The dithering pattern is the same in the old v0 GPU (as used in my launch-day SCPH-1002 unit) and the newer v2 GPU (as in the SCPH-7002 unit I currently use for most of my tests). And they both dither monochrome lines but not monochrome polys. I have a few PSones, but no method of running homebrew c...

Yes, you can have a single color for the entire polygon (flat) or you specify a color for each vertex (gouraud). When dealing with a texture, you modulate the texel color with the polygon color, unless the no modulate bit is set. That is, you take the color from the texture and multiply it with the ...

I wanted to be sure that [0,0,0] is a "reserved" color and thus not safe to use. The single alpha bit is also important. The PSX will only skip texels with A = R = G = B = 0. So unless you use blending, just set the alpha bit and you have real black, it's only when you use blending that y...

Shadow wrote:You can even go as low and make it RGB 1, 1, 1.

The PSX uses 5 bits per component, so the lowest you can go is 8 (if the scale is 0-255), and yes, you can tell the difference between such a color and black. Atleast if you also have some real black present to compare it to.

1. The PSX does modulate with a fixed color scale of 2, that is, rather than the usual (color * color) / 256 it does (color * color) / 128. Just do ((texel_r << 3) * (color_r)) >> 7, possibly add dithering, and then saturate the color. As for blending, the 4 blending modes are (d+s)/2, (d+s), (d-s) ...

On my setup, Caetla refuses to recognize any memory cards. Interestingly, I can use the mcbackup and mcrestore catflap functions to read and write memory cards, but the Caetla firmware (UI and mclist/mcup/mcdown) refuse to see the saves on any of my memory cards and reports "Card in slot x is n...

The small square is a sprite moving around the screen. There's no magic going on in transfering the texture or clut to VRAM, it's just that after rendering the sprite the first time, I wipe the VRAM and after the demo loop has been run once, I wipe the RAM and scratchpad as well.

I hacked together a little silly "demo" yesterday, mainly to mess a little with most emulators. It requires proper emulation of CPU and GPU caches to work.

It's in the Misc section of my wiki.

I would recommend having a look at martin korth's programming specs document. Find latest version here . It's much more accurate and contain more details than the "Everything ..." document. Over at my PSX experiments site you can find some software to verify the accuracy of certain aspects...

I've got an Xplorer FX, so it seems I already have the correct version (0.34). Thanks!

Is there a version history available somewhere? I currently have the 34 version flashed to my Xplorer and would like to know if there's any benefit in upgrading, or if I better not try to fix what isn't broken

Am I the only one where startup is so hard :-)? Nope. I had many issues as well before I managed to get a setup working correctly on my XP machine. It wasn't until I found X-Killer v0.55 (and thus managed to reflash my Xplorer cart with caetla 0.34) and catflap 2.36 that I finally had a setup that ...