Atari 2600

werpu · Post by **werpu** » Fri Feb 21, 2020 8:41 pm

Ok now I know more, the problems are indeed related with the 1 joystick 2 joystick detection.I finally attached my second Teensy to the mister
to simulate the second controller. And voila, as soon as I hit the start button on joystick 2 the game starts for joystick 1.
This is reproducible on every game I tried.
So it seems like start on j1 is ignored and the games wait for an input on j2 before activating j1.
So all is well now, I even was able to start and play kaboom on my integrated paddles after i hit the j2 start button.
So for everyone having similar problems attach a second gamepad/joystick and simply use that for the initial game start.

So that leaves one final question, does anyone have any idea why pitfall II crashes the mister a2600 core?
According to the docs it shouldnt.

Sorgelig · Post by **Sorgelig** » Fri Feb 21, 2020 9:00 pm

Pitfall II for 2600 uses another "computer" in the cartridge, IIRC. Of course it's not implemented.

Chris23235 · Post by **Chris23235** » Fri Feb 21, 2020 10:48 pm

Pitfall II works fine, the soundchip is simulated, all you have to do is rename the extender to p2 so that the core knows you want to play Pitfall II.

werpu · Post by **werpu** » Sat Feb 22, 2020 10:52 am

Thanks yes renaming the file to a p2 extension helped. It works now.
Thanks for the help.

djsquare · Post by **djsquare** » Sat Feb 22, 2020 4:03 pm

Chris23235 wrote:Pitfall II works fine, the soundchip is simulated, all you have to do is rename the extender to p2 so that the core knows you want to play Pitfall II.

Thanks for sharing this. I tried it myself and it works. I didn't think it was possible to play Pitfall 2

NML32 · Post by **NML32** » Sat Feb 22, 2020 4:41 pm

djsquare wrote:
Chris23235 wrote:Pitfall II works fine, the soundchip is simulated, all you have to do is rename the extender to p2 so that the core knows you want to play Pitfall II.
Thanks for sharing this. I tried it myself and it works. I didn't think it was possible to play Pitfall 2

This Google Sheet might be helpful.

https://docs.google.com/spreadsheets/d/ ... edit#gid=0

PhantombrainM · Post by **PhantombrainM** » Thu Mar 19, 2020 4:04 pm

Last commit cebad224ac7b28b7aae2b27938fd9acb88d15478 // Update sys. Tweaks for direct video

breaks some games.
For example: Mouse Trap (CBS Electronics (1983) PAL or Smurf (CBS Electronic) (1983) PAL.

This were also some games with shaking picture.
I found the solution for the shaking picture in latest TCA2601 source code and ported it to MISTer and made a pull request.
Other games which work will benefit from it already. So if you find the problem with the incompatibility in the commit above I think we have a good A2600 Core. Unfortuntalty there are too many entries in that commit and I can't fix it.

regdards,
PhantombrainM

ewok · Post by **ewok** » Tue Apr 07, 2020 9:47 pm

Hi,

Fortunately more roms work now. Big thanks for that. What is driving me nuts is hdmi output for this core for the game Asteroids. I get a flickering screen or flickering line at the bottom. Does somebody have a stable screen with this game with what settings?

Any help is appreciated. Thanks!

NML32 · Post by **NML32** » Tue Apr 07, 2020 10:50 pm

ewok wrote:Hi,

Fortunately more roms work now. Big thanks for that. What is driving me nuts is hdmi output for this core for the game Asteroids. I get a flickering screen or flickering line at the bottom. Does somebody have a stable screen with this game with what settings?

Any help is appreciated. Thanks!

I see the same thing.

ewok · Post by **ewok** » Wed Apr 08, 2020 6:44 am

Thanks! It’s not me

Hopefully next time. We still proceed with this core. That is great!

bootsector · Post by **bootsector** » Wed Apr 08, 2020 11:33 am

Is changing the ROM file extension the only way to set the mapper? Allowing the user to choose the mapper from the OSD menu before loading the ROM would be great too.

Sorgelig · Post by **Sorgelig** » Wed Apr 08, 2020 12:16 pm

bootsector wrote:Is changing the ROM file extension the only way to set the mapper? Allowing the user to choose the mapper from the OSD menu before loading the ROM would be great too.

changing the extension is one time operation which is more convenient than remembering the mapper for every game.

redsteakraw · Post by **redsteakraw** » Fri Apr 10, 2020 1:32 pm

renaming the extension doesn't seem like that big of a deal, I love the 2600 and 7800 but the MiSTer core is incomplete at least over HDMI. I guess the non standard analog output some devs used pushes the scaler to the point of breaking that or the core itself needs a rework. I heard rumors someone is working on it and is also going to add a 7800 core. There is enough going on elsewhere in MiSTer that this isn't a pressing issue. At least most of the games are playable. I just feel a bit bad Custard can't have his Revenge.

Sigismond0 · Post by **Sigismond0** » Wed May 06, 2020 1:58 pm

I'm having an issue with the 2600 core, where the image is shifted down on my PVM-20M2MDU by about 20% of the screen height--big black bar at the top, and the bottom is cut off. Every single other console core is perfectly centered, CPS1 is good, and so are every official arcade core I've tried so far. It shouldn't be a display calibration issue. Any idea why this particular core is problematic?

djsquare · Post by **djsquare** » Wed May 06, 2020 2:15 pm

Sigismond0 wrote:I'm having an issue with the 2600 core, where the image is shifted down on my PVM-20M2MDU by about 20% of the screen height--big black bar at the top, and the bottom is cut off. Every single other console core is perfectly centered, CPS1 is good, and so are every official arcade core I've tried so far. It shouldn't be a display calibration issue. Any idea why this particular core is problematic?

I've had the same issue ever since I got my MiSTer back in 2018 with RGB. At least I can use HDMI for Yar's Revenge

PhantombrainM · Post by **PhantombrainM** » Wed May 06, 2020 9:06 pm

Some games have always been shifted down way to much on CRT like for ex. Winter Games where on HDMI it's correct.It's a known issue and never worked. (yet).

RedMoonLevel9 · Post by **RedMoonLevel9** » Tue May 12, 2020 3:43 pm

I have the same problem with only this core as well. Shame I don't have the rare extron 203rxi which would solve it.
It does this on two different crt tvs though so maybe something can be adjusted in the core just to bring it up a little?
It's probably an annoying thing to be asked for if you're a dev but it would be great as the clean video output wipes the floor with my rgb modded 2600!

djsquare · Post by **djsquare** » Tue May 12, 2020 5:48 pm

RedMoonLevel9 wrote:I have the same problem with only this core as well. Shame I don't have the rare extron 203rxi which would solve it.
It does this on two different crt tvs though so maybe something can be adjusted in the core just to bring it up a little?
It's probably an annoying thing to be asked for if you're a dev but it would be great as the clean video output wipes the floor with my rgb modded 2600!

Really? You believe our beloved MiSTers have a better analogue RGB signals than Tim Worthington's RGB mod? I'm just curious here, I've never heard that before

RedMoonLevel9 · Post by **RedMoonLevel9** » Tue May 12, 2020 5:53 pm

Honestly I'm not sure about that particular RGB mod but the Mister knocks mine into a cocked hat!
It has a noiseless signal as far as I can tell tbh, it's going from the Mister IO board to an Extron 160-xi and hence to my Sony TV, looks superb whereas my Atari has some noise and ghosting, although admittedly that could be the quality of the mod.

paulbnl · Post by **paulbnl** » Tue May 12, 2020 6:01 pm

I have being doing some testing and the vertical position on CRT is much better with the original Vsync of the core instead of the regenerated one.

Sorgelig which games have issues with the original Vsync?

Sorgelig · Post by **Sorgelig** » Tue May 12, 2020 10:22 pm

I don't remember all details already.
It seems some games don't generate vblank or it's overlapped with vsync. MiSTer needs clean hblank/vblank.
May be something else

paulbnl · Post by **paulbnl** » Wed May 13, 2020 6:14 pm

I found some games that enable Vsync before Vblank: Battlezone, Pac-Man, Secret Quest. The scaler works fine with original sync even with those games.

I have added an auto switch that outputs the original Vsync normally and switches to generated Vsync if a game starts Vsync before Vblank. It works well but is the generated Vsync even needed if the scaler already works well with original Vsync?

Sorgelig · Post by **Sorgelig** » Wed May 13, 2020 6:48 pm

scandoubler won't work with vsync before vblank
I think the best version should be vblank forcedly enabled 2-3 lines before the vsync. So need to count vsync-to-vsync lines and enable vblank on next frame 3 lines after vsync and 3 line before vsync. i.e not replace vblank but additionally forcedly enable.
Also of course need to align vsync to hsync to allow direct-video.

paulbnl · Post by **paulbnl** » Wed May 13, 2020 7:24 pm

Scandoubler also works with original sync.

Maybe because those games enable Vsync only about half a line before Vblank so most of Vsync is active during Vblank.

Sorgelig · Post by **Sorgelig** » Wed May 13, 2020 7:41 pm

paulbnl wrote:Scandoubler also works with original sync.

Maybe because those games enable Vsync only about half a line before Vblank so most of Vsync is active during Vblank.

make sure HDMI video is fine and not frozen.
May be you can also check this issue as well: https://github.com/MiSTer-devel/Atari26 ... /issues/11

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