The colors...

... are still not quite right:

Let's add some colors

The moment you see the endianess is wrong

Think I fixed one bug, but this way I loose the half tones. And the endianness is definitely wrong:

The endianness is wrong

Above I treat the bytes as pixels. The endianness is definitely wrong. Fixing the endianness the picture gets better:

The endianness is correct

Not sure if the bit order in the byte is correct. And no idea why it's so contrast and monochrome. Treating the bits as pixels with the proper endianness the picture looks more interesting:

As if a bit were a pixel

The result must be somewhere in between the two above... But I'm think I'm done for this weekend.

The moment you see you used bits instead of bytes

Trying to find out how the cg6 registers work I get some funny pictures.

When the bytes are treated as bits

Here it interprets bytes as bits. Plus some more bugs indeed...

Fixed the cgsix colormap

Looks like the cgsix DAC is slightly different from the one used in cgthree. Fixed it and now the image doesn’t look so psychedelic anymore:

 

cgsix in the DFB mode

Now, that was the easy part. Making it work under OpenWindows is going to be trickier. There is virtually no documentation on the GPU. I guess this manual is really lost: as Sun tried to open the specs back in 2008, they failed with “Unable to locate (15-July-08)” message.

Does anyone by any chance have the book “TurboGX Reference Card” (p/n 800-5112) or any other document which describes how to program the TEC and FBC units of the TGX chip?

The first experiments with cgsix emulation

Okay, I’ve got the first picture with a virtual cgsix under QEMU. The colors are slightly distorted, but at least the image is there:

cgsix in red