I've written comprehensive release notes on the github page. But just to emphasise, this is a "preview" release of some major changes.

It's a "preview" because there are some changes that have not yet finalised - the default colour palette. However, I think the project would benefit if people can have a look at it now.

https://github.com/JetSetIlly/Gopher2600/releases/tag/v0.40.0-preview

First time I heard of CRT Cataracts was on Adrian Black's channel. He has a really worse case of this:

Quote from: SpiceWare on 04 Jan 2025, 06:55 AMThat's pretty wild. Never heard of CRT Cataracts before

I hadn't either. Definitely not something you want to try to repair on a one-of-a-kind screen.

That's pretty wild. Never heard of CRT Cataracts before

I'm deep into thinking about CRT emulation at the moment so this caught my eye. This is a level of detail I'd not even considered.

https://blurbusters.com/crt-simulation-in-a-gpu-shader-looks-better-than-bfi/

I don't think it would have much benefit for 2600 emulation though. Still it's interesting to think about.

For CRT fans
https://www.youtube.com/watch?v=JfZxOuc9Qwk

Quote from: JetSetIlly on 21 Dec 2024, 08:35 AMI thought LUM defined the chroma only in SECAM but it also defines the luminance as you would expect.

Yes, the luminance seems to work just like PAL and NTSC models. Attached are screenshots of my SECAM console showing color bars with the "TV TYPE" switch set to "color" and TV saturation set to 50%, then with TV saturation turned completely down to 0% and finally with console set to "B&W" and TV saturation back to 50%.
(Unlike PAL and NTSC ones, The TV TYPE switch on SECAM models disables color generation in hardware.)

Note that the yellow looks actually light green in my case, probably because of the crappy digital TV demodulator, or the console needs servicing, or both.


For some reason I'm not able to insert the images inline while posting, altough I'm sure I could do that in the past.

Quote from: alex_79 on 12 Dec 2024, 01:27 AM

Quote from: JetSetIlly on 11 Dec 2024, 09:04 PMDo SECAM consoles have an adju/home/steve/Desktop/Screenshot from 2024-12-20 21-33-09.png
stment pot. If so, what does it actually do?

The only adjustable components on the board are two variable capacitors, but I have no idea what they're for.

I'm just coding up the calculation of SECAM colours and I think they might define the range for the Y component.

As we know, the HUE nibble is ignored in SECAM consoles. The LUM nibble is used to define the colour wheel angle AND the Y value in the YUV calculation. I thought LUM defined the chroma only in SECAM but it also defines the luminance as you would expect.

So, LUM 1 creates blue with the lowest Y value. LUM 2 creates red with a slightly higher Y value. all the way to LUM 6 which creates yellow with the highest Y value.

Having two controls make me thinks it relates to the min/max limits of the Y. But it could easily be a hue control and saturation or something else. I'd like to know for sure.

Screenshot attached of the generated SECAM colours.

Quote from: JetSetIlly on 11 Dec 2024, 09:04 PMDo SECAM consoles have an adjustment pot. If so, what does it actually do?

The only adjustable components on the board are two variable capacitors, but I have no idea what they're for.

Do SECAM consoles have an adjustment pot. If so, what does it actually do?