Only, japanese PSX'es seem to have a special model number (SCPH-5000 for consoles with LATE-PU-8 boards). So the change occurred between 'original SCPH-1002' models and 'later SCPH-1002' models.

If the articles did actually refer to the 'banding' issue, then it must have been fixed around 1996 (or maybe late 1995), and model-wise, EARLY/LATE-PU-8 were both called SCPH-1002 in europe (or SCPH-1001 in us). Yaroze wrote:I've been re-reading some old issues of EDGE Magazine (UK), and â€“ according to reader correspondence in issues 67 & 68 from 1999 (see link below) â€“ some people were claiming that newer models of the PlayStation / PS1 (presumably the SCPH-5552 or SCPH-7502 ?) featured slightly better graphics than the original SCPH-1002 model (specific games mentioned were Micro Machines and Soul Blade). and, it's been apparently fixed on LATE-PU-8 boards, ie. So, I am quite sure that I've reproduced the 'banding' glitch. Anyways, the test results are looking pretty identical to the 'banding' & 'no banding' pictures posted above. I've tried to take photos of my tests, but photographing the TV screen didn't work out out too well. That effect occurs only on the old 160pin GPU, the later 208pin GPUs on LATE-PU-8 and PM-41 boards are having smoother dithering, with different dithering applied to each shading level. Textured gouraud shaded polygons are dithered too, but, as AmiDog mentioned, the texture blending on old GPU drops the lower 3bit of the gouraud shaded color, so each 8 shading levels are forcefully getting the same dithering applied, and then the next higher 8 shading levels are abruptly getting higher brightness.

Raw gouraud shaded polygons (without texture) are dithered smoothly on all GPUs.

I've been running some GPU tests on several boards this morning:ĮARLY-PU-8 board (with 160pin GPU 'CXD8514Q') (SCPH-1002) (dated around 1995)

Emuparadise scph 5501