Kronos - Too fast, and wrong BIOS

[SkyHighGam3r]

It’s been a long time since I’ve given Kronos a try, opting instead for beetle_saturn. I noticed it’s quite a few updates since I last looked so I wanted to give it a go, but I’m running into problems.

The first, most glaring problem, is it is running WAY too fast. The bios screen rushes by, and the games are running at like 3x speed. It’s unplayable like this.

The second, is I can’t get it to load the correct BIOS. Which I tried following directions here, but no luck:

Question regarding Kronos (Saturn) bios startup

I have all the original bios for the Saturn. When I was running the Bettle core, I had the earliest bios startup screen for the system starting. But the startup screen is one I’m not familiar with. Do I need to do something different with my bios, (naming/placement) in order for the older bios startup screen to be initiated? Thanks!

My saturn_bios.bin is MD5: af5828fdff51384f99b3c4926be27762

This is a US BIOS, matches the requested MD5 in the core info file, and is located at …\RetroArch\system\kronos, and it shows as present in Core Information when RetroArch & Kronos is running.

When I load the game though, I get the JP BIOS sequence:

Would appreciate any help I can get on this one. I know I had this running a long time ago.

[hunterk]

I get the US BIOS animation with MD5 of 3240872c70984b6cbfda1586cab68dbe

[SkyHighGam3r]

Thank you, I was able to dig a bit deeper and it seems like the requested saturn_bios.bin w/ af5828fdff51384f99b3c4926be27762 is a Region Free BIOS, from what I can tell; maybe?

I was able to track down the the mpr-17933.bin w/ 3240872c70984b6cbfda1586cab68dbe and rename it to “saturn_bios.bin” and that totally worked.

It’s interesting as that’s also a different MD5 from the one I use for beetle_saturn, which has the same name, but an MD5 of bde8d6225194b1be7d7127f9f5a7bb29 … which also worked. So I guess the issue is I was mistaken about the initial BIOS being US, go figure.

I ALSO figured out the speed issue, kind of. I’m running on a 120hz screen, and it seems tied to that.

I discovered that if I have either Vsync Off or Vsync ON + Black Frame Insertion, it plays at the correct speed. For some reason Vsync On + BFI Off was causing the crazy speed boost.

Ultimately though, it looks like the issues keeping me away from the core are still present. The floor in Sonic R (and I suspect other similar textures use-cases in other games) wobble around really badly.

Plus the Output to Original resolution feature seems to be broken. I can upscale it to 2x, but it puts out a 480 image whether or not that core option is on/off. This was actually the main reason I wanted to use the core, as I do the same for Mupen and Beetle PSX HW. Upscale to 480 and then downscale to 240. You get an amazing image this way.

Ah well, I appreciate the help hunterk, as always. Thank you!

[thingsiplay]

I have a list of Saturn bios with MD5:

0306c0e408d6682dd2d86324bd4ac661  Bios GameNavi HiSaturn 1.03.bin
3ea3202e2634cb47cb90f3a05c015010  Bios HI-Saturn 1.01 (J) [!].bin
cb2cebc1b6e573b7c44523d037edcd45  Bios Hi-Saturn 1.02 (J).bin
f273555d7d91e8a5a6bfd9bcf066331c  Bios Saturn 1.00a (U) [!].bin
af5828fdff51384f99b3c4926be27762  Bios Saturn 1.00 (J) [!].bin
3240872c70984b6cbfda1586cab68dbe  Bios Saturn 1.01a (U) [!].bin
85ec9ca47d8f6807718151cbcca8b964  Bios Saturn 1.01 (J) [!].bin
ac4e4b6522e200c0d23d371a8cecbfd3  Bios V-Saturn 1.01 (J) [!].bin
74570fed4d44b2682b560c8cd44b8b6a  Sega Saturn BIOS (1.003) (J).bin
3240872c70984b6cbfda1586cab68dbe  Sega Saturn BIOS (EUR).bin
74570fed4d44b2682b560c8cd44b8b6a  Sega Saturn BIOS (Oct 12, 1994).bin

The one with af58... is Japanese “Bios Saturn 1.00 (J) [!]” version. And the one with 3240... is “Bios Saturn 1.01a (U) [!]” AND “Sega Saturn BIOS (EUR)”, so its used for both regions. I can’t say for sure if these are accurate, but it seems to be inline with what you guys report here.