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The clock output externally should preferably come from a PLL.spark2k06 wrote: ↑Sun Jul 10, 2022 5:40 am
On the other hand, a user told me that although the direct clock of the sdram works well, in many of the MiSTer cores there is a small offset as explained here:
https://github.com/mist-devel/mist-boar ... on-4-sdram
What do you think about it?
When writing to sn76489, the ready signal must be wired. Because the write timing is shifted by clock_en_i and divider.kitune-san wrote: ↑Sun Jul 10, 2022 11:39 am One thing I noticed.
If you need a ready signal, you can do the following.
in Chipset.sv.And I don't think the edge signal for the write signal within Peripherals.sv is necessary. Because it is done within sn76489_latch_ctrl.vhd.Code: Select all
READY u_READY ( ... .io_channel_ready (io_channel_ready & memory_access_ready & tandy_snd_rdy), ...
Unfortunately it doesn't work, I already did this test myself, connecting the signal directly to the 8088 module with an AND. The result is the same, the BIOS hangs at startup, so it is unstable.kitune-san wrote: ↑Sun Jul 10, 2022 11:39 amI haven't seen this thread in a while.spark2k06 wrote: ↑Sun Jul 10, 2022 5:40 am
@kitune-san, I have tried to improve the implementation of the tandy sound module by following a little bit the methodology you have used in other modules:
https://github.com/spark2k06/PCXT_MiSTe ... 0052703e0f
Despite some improvement, as you can see in the video, the sound is still distorted... you can compare it with another video where you can see how it should sound:
https://www.youtube.com/watch?v=ersh8Yz-CC8&t=35s
Can you think of a way to fix it?
It is great progress.
One thing I noticed.
If you need a ready signal, you can do the following.
in Chipset.sv.And I don't think the edge signal for the write signal within Peripherals.sv is necessary. Because it is done within sn76489_latch_ctrl.vhd.Code: Select all
READY u_READY ( ... .io_channel_ready (io_channel_ready & memory_access_ready & tandy_snd_rdy), ...
I agree that connecting it to the 8088 module directly is not the right thing to do, I only comment that in this case it has had the same effect as with your solution of connecting it to the ready module, and that is that the core does not load the BIOS. I will continue investigating, thank you very muchkitune-san wrote: ↑Mon Jul 11, 2022 12:01 am If the ready signal is connected directly to the 8088 module, the bus may not be controlled properly.
I recommend connecting the ready signal to the ready module.
I have moved your pull request to the prebeta 1.4 branch, and then removed the tandy_snd_rdy signal from the ready module, as this is what causes the core to hang during BIOS boot.spark2k06 wrote: ↑Mon Jul 11, 2022 3:21 amI agree that connecting it to the 8088 module directly is not the right thing to do, I only comment that in this case it has had the same effect as with your solution of connecting it to the ready module, and that is that the core does not load the BIOS. I will continue investigating, thank you very muchkitune-san wrote: ↑Mon Jul 11, 2022 12:01 am If the ready signal is connected directly to the 8088 module, the bus may not be controlled properly.
I recommend connecting the ready signal to the ready module.
Thanks for the tip and don't worry, if I don't manage to solve it, we'll leave it pending.kitune-san wrote: ↑Mon Jul 11, 2022 4:11 am Maybe the tandy chip select negating during memory access is causing the problem.
Sorry, can't confirm this right now.
I did a quick test to avoid the tandy_select denial, the result is the same... crash during BIOS loading.kitune-san wrote: ↑Mon Jul 11, 2022 4:11 am Maybe the tandy chip select negating during memory access is causing the problem.
Sorry, can't confirm this right now.
Don't worry, It's probably more my problem, I work more by intuition than by real knowledge in this area. I finally got it!kitune-san wrote: ↑Mon Jul 11, 2022 5:38 am Sorry, maybe I didn't communicate it well.
I will try after work.
Code: Select all
.ce_n_i(~(~tandy_chip_select_n & ~io_write_n))I select tandy in setup in a game that supports Tandy graphic (ex.prince of persia) and tandy does not apply when I run the game. I use Juko ST bios and your YouTube video doesn't seem to be this bios. Is there a separate tandy supported bios? How to apply Tandy bios Even if I select Tandy from the osd menu, I won't see the red box on your YouTube screen.spark2k06 wrote: ↑Mon Jul 11, 2022 6:00 amDon't worry, It's probably more my problem, I work more by intuition than by real knowledge in this area. I finally got it!kitune-san wrote: ↑Mon Jul 11, 2022 5:38 am Sorry, maybe I didn't communicate it well.
I will try after work.
Now what I do is prevent the CS signal from entering with memory accesses at the same address as the I/O port:
During the day I will upload it to the prebeta 1.4 branch and provide the binary in this thread.Code: Select all
.ce_n_i(tandy_chip_select_n & ~memory_read_n & ~memory_write_n)
Great! thank you!spark2k06 wrote: ↑Mon Jul 11, 2022 6:00 amDon't worry, It's probably more my problem, I work more by intuition than by real knowledge in this area. I finally got it!kitune-san wrote: ↑Mon Jul 11, 2022 5:38 am Sorry, maybe I didn't communicate it well.
I will try after work.
Now what I do is prevent the CS signal from entering with memory accesses at the same address as the I/O port:
During the day I will upload it to the prebeta 1.4 branch and provide the binary in this thread.Code: Select all
.ce_n_i(~(~tandy_chip_select_n & ~io_write_n))
you'll need a Tandy BIOS loaded to be able to use tandy. But IIRC keyboard is not working with such bios, yet. Tests are executed by adding demos to autoexec.batsuww37 wrote: ↑Mon Jul 11, 2022 6:39 amI select tandy in setup in a game that supports Tandy graphic (ex.prince of persia) and tandy does not apply when I run the game. I use Juko ST bios and your YouTube video doesn't seem to be this bios. Is there a separate tandy supported bios? How to apply Tandy bios Even if I select Tandy from the osd menu, I won't see the red box on your YouTube screen.spark2k06 wrote: ↑Mon Jul 11, 2022 6:00 amDon't worry, It's probably more my problem, I work more by intuition than by real knowledge in this area. I finally got it!kitune-san wrote: ↑Mon Jul 11, 2022 5:38 am Sorry, maybe I didn't communicate it well.
I will try after work.
Now what I do is prevent the CS signal from entering with memory accesses at the same address as the I/O port:
During the day I will upload it to the prebeta 1.4 branch and provide the binary in this thread.Code: Select all
.ce_n_i(tandy_chip_select_n & ~memory_read_n & ~memory_write_n)
How can I load the Tandy bios? Juko st bios works with boot.rom. Does Tandy bios work this way too?jordi wrote: ↑Mon Jul 11, 2022 6:52 amyou'll need a Tandy BIOS loaded to be able to use tandy. But IIRC keyboard is not working with such bios, yet. Tests are executed by adding demos to autoexec.batsuww37 wrote: ↑Mon Jul 11, 2022 6:39 amI select tandy in setup in a game that supports Tandy graphic (ex.prince of persia) and tandy does not apply when I run the game. I use Juko ST bios and your YouTube video doesn't seem to be this bios. Is there a separate tandy supported bios? How to apply Tandy bios Even if I select Tandy from the osd menu, I won't see the red box on your YouTube screen.spark2k06 wrote: ↑Mon Jul 11, 2022 6:00 am
Don't worry, It's probably more my problem, I work more by intuition than by real knowledge in this area. I finally got it!
Now what I do is prevent the CS signal from entering with memory accesses at the same address as the I/O port:
During the day I will upload it to the prebeta 1.4 branch and provide the binary in this thread.Code: Select all
.ce_n_i(tandy_chip_select_n & ~memory_read_n & ~memory_write_n)
Tandy is a very interesting version, if necessary, we can make a switch from the OSD menu for the selection of the machine (IBM PC or Tandy 1000), and depending on this switch, that the keyboard works in one way or another... among other things that I would take into account.kitune-san wrote: ↑Mon Jul 11, 2022 7:51 am In tandy, the use of pb6 in 8255 seems to be different from pcxt.
This is probably why the keyboard does not work.
This is great, I just tried it and it works. However, the Tandy sound fix that I just uploaded to the prebeta 1.4 branch is missing. Can you make a pull request to this branch merging this change?kitune-san wrote: ↑Mon Jul 11, 2022 12:45 pm If video output is set to tandy, the keyboard can be used with tandy bios.
you are both honorable wizardskitune-san wrote: ↑Mon Jul 11, 2022 12:45 pm If video output is set to tandy, the keyboard can be used with tandy bios.
!! I sent a pull request.spark2k06 wrote: ↑Mon Jul 11, 2022 12:55 pmThis is great, I just tried it and it works. However, the Tandy sound fix that I just uploaded to the prebeta 1.4 branch is missing. Can you make a pull request to this branch merging this change?kitune-san wrote: ↑Mon Jul 11, 2022 12:45 pm If video output is set to tandy, the keyboard can be used with tandy bios.
Thanks!
In principle we will leave it as it is, but yes, I will change it later, thank you very much.kitune-san wrote: ↑Mon Jul 11, 2022 1:15 pm In my commit the tandy mode is related to the video settings, but it might be better to create a separate switch.
Fixed my issue with the HDD not booting ! Thanks !spark2k06 wrote: ↑Mon Jul 11, 2022 3:22 pm I have added a new signal called IORQ which I believe will improve the overall performance.
https://github.com/spark2k06/PCXT_MiSTe ... 7c6c84928b
Attached new binary