Atari 7800 Core

[kamshaft]

Found this...
https://github.com/Kitrinx/Atari7800_MiSTer

It's two years old.

[tontonkaloun]

yes there is not much and very few games that work

[lroby74]

Would be nice to have an updated 7800 working code

[Moondandy]

Rysha/Kitrix said she would do the 7800 after finishing the 2600, but problem is she isn't terribly motivated to finish the 2600. I don't think it is a fun core to work on.

It's a real shame, as they are popular and big consoles. Maybe Sorg, or another dev, will tag team with her at some point and they will knock them out in a weekend. I know what it's like when you have a big project that isn't fun to work one and are doing it on your own.

[lroby74]

Atari Lynx core has been realized..

Now would be nice to have an updated working Atari 7800 core too

[deltax0]

Atari 7800 has been updated by over there in the discord. By Rysha
The new build is very good now. The older builds where tarrable. New build plays mostly everything.
It's barley a beta build now. but still alpha. looks like it may get a release some time soon.
They said look for Trebors_7800_ROM_PROPack. it works better as the headers are better or something. got smokes pack games running fine thou.
I have uploaded it for you guys. same one's from discord.
https://drive.google.com/file/d/10gBlDx ... sp=sharing

[djsquare]

Atari 7800 has been updated by over there in the discord. By Rysha
The new build is very good now. The older builds where tarrable. New build plays mostly everything.
It's barley a beta build now. but still alpha. looks like it may get a release some time soon.
They said look for Trebors_7800_ROM_PROPack. it works better as the headers are better or something. got smokes pack games running fine thou.
I have uploaded it for you guys. same one's from discord.
https://drive.google.com/file/d/10gBlDx ... sp=sharing

This is very playable indeed. Thanks for sharing

[deltax0]

I read it was Rysha's side project. Just something she worked on on her free time.
She just decided to put a bunch of work into it just recently. I think most games play fine.
Hope it gets officially released with some more fixes soon.

[Pepeart]

Tried the core but its not working on my sony pvm 15khz

[dmckean]

Tried the core but its not working on my sony pvm 15khz

The version shared above is old now. There was a problem with video that was fixed on the 17th. I recommend waiting until it's released.

[deltax0]

Tried the core but its not working on my sony pvm 15khz

try it on the hdmi tv. It's still alpha stages.
Wait for release i guess. Just hope it does.
Whatever one's i found on discord i snatched up. If you got newer one please share.

[BigBossMaeda]

Tried the core but its not working on my sony pvm 15khz

It works on my crt, I'm using a PVM 2530.

[rcade]

This works great. Almost everything plays with the 3-21 version

[lroby74]

Tried it on my Sony 21" CRT Trinitron, it works very nicely, i love it!!!

[metalfacemark]

oh sweet, ive always wanted to try the 7800.

[deltax0]

new version over there on mister discord.
I bet a official build in the updater is incoming.

[Kitrinx]

This core is now released, enjoy

[akeley]

It's dangerous to go unheadered. Take this!

[pbsk8]

is Rikki & Vikki supported?

[dmckean]

is Rikki & Vikki supported?

Yes, without music but with sound effects. You also have to create your own header for the .bin file.

[Kitrinx]

is Rikki & Vikki supported?

You can use this bps patch to add the header to FoxBox.bin (or whatever you have the rom named)

[Chris23235]

What a great core. I love the color temperature option, with Hot the picture has the same colours as on my PAL machine on a CRT. Many thanks.

I noticed that the Pokey demos from the Trebor Pack don't work. Any chance to get them playing?

[pgimeno]

The MAME archive contains three roms:

Code: Select all

    4096  Defl:X     2325  43% 1996-12-24 23:32 5d13730c  7800.u7
   16384  Defl:X     9696  41% 1996-12-24 23:32 d5b61170  a7800p/7800pal.rom
   16384  Defl:X     9700  41% 1996-12-24 23:32 a0e10edf  c300558-001a.u7

Which one should I install as boot0.rom?

[Kitrinx]

What a great core. I love the color temperature option, with Hot the picture has the same colours as on my PAL machine on a CRT. Many thanks.

I noticed that the Pokey demos from the Trebor Pack don't work. Any chance to get them playing?

I actually debugged this for quite a while and discovered the issue is that they don't work on real hardware. Some flash carts may pre-initialize things they need, but it's actually an accuracy that they don't work, not a bug. I believe they won't work on Dragonfly cart either.

[Kitrinx]

The MAME archive contains three roms:

Code: Select all

    4096  Defl:X     2325  43% 1996-12-24 23:32 5d13730c  7800.u7
   16384  Defl:X     9696  41% 1996-12-24 23:32 d5b61170  a7800p/7800pal.rom
   16384  Defl:X     9700  41% 1996-12-24 23:32 a0e10edf  c300558-001a.u7

Which one should I install as boot0.rom?

There are many dumps of atari 7800 bioses, but usually the 4kb NTSC one is the best and the 16kb PAL one. If you choose to use a bios you will have to switch it between PAL and NTSC games. Additionally some homebrew games, like Defender, will break if you use a BIOS due to incorrect signatures. Alternatively you can skip the bios and all games will work.

[12characters]

It says that 2600 is not yet enabled, which hints that it is a planned feature. Considering that there is already a standalone Atari 2600 core, what would be the advantage of enabling the backwards compatibility for the 7800 core?

[kathleen]

It says that 2600 is not yet enabled, which hints that it is a planned feature. Considering that there is already a standalone Atari 2600 core, what would be the advantage of enabling the backwards compatibility for the 7800 core?

To behaves as the original hardware which allowed the use of most 2600 games. To me this is important even if there is a A2600 core.

[Lightwave]

It says that 2600 is not yet enabled, which hints that it is a planned feature. Considering that there is already a standalone Atari 2600 core, what would be the advantage of enabling the backwards compatibility for the 7800 core?

The current 2600 core has issues. The potential here would be to have a more accurate 2600.

[Chris23235]

What a great core. I love the color temperature option, with Hot the picture has the same colours as on my PAL machine on a CRT. Many thanks.

I noticed that the Pokey demos from the Trebor Pack don't work. Any chance to get them playing?

I actually debugged this for quite a while and discovered the issue is that they don't work on real hardware. Some flash carts may pre-initialize things they need, but it's actually an accuracy that they don't work, not a bug. I believe they won't work on Dragonfly cart either.

Thanks for the info.

[Kitrinx]

It says that 2600 is not yet enabled, which hints that it is a planned feature. Considering that there is already a standalone Atari 2600 core, what would be the advantage of enabling the backwards compatibility for the 7800 core?

Since a 7800 is basically a 2600 with one extra chip, I would like to add full 2600 support to it as well. While the current 2600 core does pretty well, it does have various issues, is written in VHDL, and doesn't use clock enables, which makes things like pausing the core more difficult. I decided to write my own RIOT and TIA in addition to the Maria chip, so it only makes sense to get the 2600 part of things polished up as well.