exxos's Atari, Amiga & retro forum

PhilC wrote: 29 Sep 2021 14:47 @rubber_jonnie I was just waiting for your review of petsci robots.

My IIe works on a 43" 4k TV through the start but when I use it with my composite to vga adaptor it looses sync all the time.

Am interested in an RGB solution if possible as the composite mode is pretty "special " to put it politely

Some sort of RGB solution would be ideal, am having a dig around on other forums.

If you're looking for a rgb solution for a apple 2e i use a ramworks clone and a vga card plug in on it from a2heavan.com the parts are popular and you have to check a lot to get them as they sell out a lot

Tom
@PhilC
@rubber_jonnie

Tomswork wrote: 29 Sep 2021 15:05 If you're looking for a rgb solution for a apple 2e i use a ramworks clone and a vga card plug in on it from a2heavan.com the parts are popular and you have to check a lot to get them as they sell out a lot

Tom
@PhilC
@rubber_jonnie

Cool, thanks Tom, I will definitely check that out.

BMOW (FloppyEMU) has some info on his site and had been discussing a new solution, though I don't think it has moved very far.

EDIT: Just checked out a2heaven and they are out of stock.

@rubber_jonnie

Yes they sell out all the time I just kept checking the site and you may be able to email them and reserve one

Tom

@Tomswork @rubber_jonnie shame they are out of stock. Is there any kind of DIY option? Gerbers etc to build your own?

PhilC wrote: 29 Sep 2021 15:41 @Tomswork @rubber_jonnie shame they are out of stock. Is there any kind of DIY option? Gerbers etc to build your own?

Not sure, but I will be going to have a look.

The biggest problem with RGB solutions for the Apple ][ is that it uses artefacts to fool the display into displaying certain colours using pixel frequencies which to the video decoder in the display are the same as the chroma signal in a composite video signal. Any RGB output system would have to interpret these fringes and produce a block colour instead. Of course, this also means that if the converter sees the same pixel changes, such as in text, you get erroneous colouration effects.

@stephen_usher yeah I'd read about how the Apple II's colour was created by using video effects and it explains a lot about the multi coloured text you seem to get with whites on a PAL screen.

The VGA solutions apparently takes this into consideration by reading the video and then converting it I believe?

@PhilC @rubber_jonnie
I just kept checking the site again and sent them a email to get one they work great.
There is also a hdmi card for the apple 2e in the US but is is super pricey I will see if I can find the info on it as well

https://pcweenies.com/2019/11/17/vidhd- ... pple-iigs/

Tom

stephen_usher wrote: 29 Sep 2021 15:53 The biggest problem with RGB solutions for the Apple ][ is that it uses artefacts to fool the display into displaying certain colours using pixel frequencies which to the video decoder in the display are the same as the chroma signal in a composite video signal. Any RGB output system would have to interpret these fringes and produce a block colour instead. Of course, this also means that if the converter sees the same pixel changes, such as in text, you get erroneous colouration effects.

Yep, IIRC it's called artifacting, and the Atari 8 Bits do have the same issue for some software that uses it, but I opted to not worry about that with my VBXL and just have a nice crisp display, and not worry about loss of artifacting.

I suspect what you're describing may be why the display is so fuzzy on the A][, but it is rather annoying as I want to use a single display for multiple machines, and this is stopping me doing that since the display on the TV keeps dropping out using the A][ composite.

It isn't the end of the world by any means, just annoying.