MiSTer FPGA Forum

patamar4 wrote: ↑Sat Sep 05, 2020 11:39 pm Well I took the version of JT51 that Kunihiko made for his version of Mr Puu's x68k code to use on the DE0-CV and i was able to successfully make it work by changing the lines that Kunihiko says to change, in addition to adding the OPM_JT51 path on the VHD that he modified in his git.

If someone wants to test to see the difference, sound is as it should be in ym2151.

I hope not to be upset Mr Puu I just wanted to see if it really worked, I'm not developer xD

Here are the links to kunihiko's git:

https://github.com/kunichiko/FPGA-X68k-DE0CV

and the OPM used the JT51 that he modified

https://github.com/kunichiko/FPGA-X68k-DE0CV-OPM-JT51

The original git if you want to implement in your way in your project:

https://github.com/jotego/jt51

Thanks for the hard work in bringing the x68k to mister

It would be great if Mr. Puu validates this improvement and adds it directly!

breiztiger wrote: ↑Sun Sep 06, 2020 7:05 am hi
just test with gradius II
i have a persistent sound when watching demo mode that is not present in X68000_20200902

Hi, best way is Mr Puu implement in his design, I just put it the way it would work, but for him to see that it is better than the implementation he made of the sound chip, now is to wait if he will put the jotego on the x68k correctly

Hi, thank you for this experiment!
It looks like if internal core timings (write timing to the JT51 core) are in sync or well regulated, sound is produced VERY nicely.
Many games are still having this signal timing issues and experience incomplete sound output; however I tried with MMDSP and a dedicated MDX sound driver to play various X68000 tunes. Result is top notch and bug free, very clean and wonderful music playback is possible.

...

The DMA fix released on 8/27 revealed that there was something wrong with the writing on the SASI HDD.
I have uploaded a modified version, so please update it.
http://fpga8801.seesaa.net/archives/20200913-1.html

Thank you Mr. Puu for the last version.
I will test it immediately !!!!!

Thank you !!!
It is now possible to save in the game Akumajou Dracula !!!

Hello Mr. Puu
What would be missing now is to be able to save the configuration of the x68000 core ... for example, the joystick must be configured each time the core is restarted

I'd love to change the subject of this thread to just be X68000 beta... Any idea how I can make that happen?

Ah, done!

The brand new core with the jt51 sound chip

puu wrote: ↑Sun Sep 13, 2020 1:23 pm The DMA fix released on 8/27 revealed that there was something wrong with the writing on the SASI HDD.
I have uploaded a modified version, so please update it.
http://fpga8801.seesaa.net/archives/20200913-1.html

Thanks puu! Looking forward to testing it!

tontonkaloun wrote: ↑Sun Sep 13, 2020 3:31 pm Thank you Mr. Puu for the last version.
I will test it immediately !!!!!

Thanks a lot for sharing, as usual!

tontonkaloun wrote: ↑Mon Sep 14, 2020 3:04 pm The brand new core with the jt51 sound chip

Great, thanks for sharing this as well!

I've been testing this, some games appear squashed up or to the right, probably due to different resolutions. Very impressed with the core (and the original computer)

Amazing to hear the improvement with the JT51 sound chip.

For some reason I need to set the "VGA to scaler" output to 1 on this core (vga_scaler=1). The games run, but the view area is very small.
On other cores this setting is 0 on my Sony BVM MiSTer IO setup (VGA to Scart > SCART breakout to BNC).

I thought that the X68000 core could also display in 15khz (at least for some games that support this) ?

roel27 wrote: ↑Sun Sep 20, 2020 9:31 pm For some reason I need to set the "VGA to scaler" output to 1 on this core (vga_scaler=1). The games run, but the view area is very small.
On other cores this setting is 0 on my Sony BVM MiSTer IO setup (VGA to Scart > SCART breakout to BNC).

I thought that the X68000 core could also display in 15khz (at least for some games that support this) ?

The core doesn't support this at the moment. See a previous post from puu in this thread. It always outputs 800x600@60hz I think.
This is apparently due to the original platform he developed it on not having a scaler, so the core does some internal conversion itself.

Unfortunately this means most of the video timings aren't accurate, which may or may not be a big deal depending on the game in question and how far off of 60hz is was originally intended to run.

zakk4223 wrote: ↑Mon Sep 21, 2020 8:00 pm

roel27 wrote: ↑Sun Sep 20, 2020 9:31 pm For some reason I need to set the "VGA to scaler" output to 1 on this core (vga_scaler=1). The games run, but the view area is very small.
On other cores this setting is 0 on my Sony BVM MiSTer IO setup (VGA to Scart > SCART breakout to BNC).

I thought that the X68000 core could also display in 15khz (at least for some games that support this) ?

The core doesn't support this at the moment. See a previous post from puu in this thread. It always outputs 800x600@60hz I think.
This is apparently due to the original platform he developed it on not having a scaler, so the core does some internal conversion itself.

Unfortunately this means most of the video timings aren't accurate, which may or may not be a big deal depending on the game in question and how far off of 60hz is was originally intended to run.

Ok, thanks for you clarification

I found a sound issue with the last version with the integration of JT51. It is maybe a jt51 issue or integration issue. This issue is not present in on the core without JT51.
In the game Gradius 2, if you let attract mode play. At the game over screen a weird sound appeared until the Konami logo.
Can someone confirm it ?

@puu, for information there is some updates on TG68K cpu (https://github.com/TobiFlex/TG68K.C) It maybe helps this core.
This code is used on Amiga core.

Thanks,

hello,how do you get the sram file?i'm lost.

thanks very much

i'm sorry ......i find it in the pezz82 topic

thanks

It doesn't matter if you don't have the SRAM file. There is no problem with normal operation with the initial value. If you want to create it, create an empty 16kB file, put it in the SD card, select it as an SRAM file, and then select STORE SRAM to update the contents. Just selecting a file does not load it. LOAD SRAM is required to load.

wrong post, sorry.

puu wrote: ↑Thu Oct 22, 2020 12:28 am It doesn't matter if you don't have the SRAM file. There is no problem with normal operation with the initial value. If you want to create it, create an empty 16kB file, put it in the SD card, select it as an SRAM file, and then select STORE SRAM to update the contents. Just selecting a file does not load it. LOAD SRAM is required to load.

thanks very much PUU ,for the information.

I am also having sound issues with Chourensha. It seems, both non JT51 and Jt51 versions have different issues with generating all instruments consistently, as well as the noise channel.it would be soooo awesome, if someone could look into it. It's my favorite game!

Is the second SD still needed with the beta updates?

reminon wrote: ↑Sun Nov 22, 2020 11:34 pm Is the second SD still needed with the beta updates?

nope. just put the X68000.rom in the /bootrom directory, and your disk images in /X68000.

Hi !

How amazing this x68k core is getting ! Thanks for the hard work !

I have tried the os9 images from this site : https://nfggames.com/X68000/index.php/O ... /?upload=1

Unfortunately the "bootloader" does not seem to find any OS-9 kernel. Getting into that bootloader seems to indicate the image itself is somehow readable I suspect ?

Using the XM6 Pro-68k emulator I get this screen :
and os9 boots into its gui

With MiSTerFPGA :
I did try inserting the $00005194 address in MiSTer but I get strange keyboard input and it does not work any better. Same behaviour with X68000_20200715.rbf & X68000_20200913.rbf. As you can see on the screenshot, the first text column also has disappeared starting with 5th line.

Thanks helping !

The latest blog post from 12/12/2020 has an attachment "release-F68k_DE0CVDEMU.201212.qar" that does not contain an rbf file for MiSTer. Could somebody please upload the latest build for MiSTer?