PC98 Core

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pgimeno
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Re: PC98 Core

Unread post by pgimeno »

Cohge wrote: Thu Feb 25, 2021 8:50 pm Thanks for the info, didnt know they were in this mame set :)
After looking more carefully, it turns out they are in several different formats, including d88 itself.

Nevertheless, here's an FDD to D88 converter:

http://www.formauri.es/personal/pgimeno ... fdd2d88.py

Usage: python fdd2d88.py <input file> <output file>

Notes: Don't disable assertions (don't use -O to run). Should run with Python 2 and 3. It's not very flexible with the accepted format, but it should be OK with most files. It's not very thoroughly tested. If there is a problem, please report it to me.
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Re: PC98 Core

Unread post by Alkadian »

pgimeno wrote: Fri Feb 26, 2021 5:58 pm
Cohge wrote: Thu Feb 25, 2021 8:50 pm Thanks for the info, didnt know they were in this mame set :)
After looking more carefully, it turns out they are in several different formats, including d88 itself.

Nevertheless, here's an FDD to D88 converter:

http://www.formauri.es/personal/pgimeno ... fdd2d88.py

Usage: python fdd2d88.py <input file> <output file>

Notes: Don't disable assertions (don't use -O to run). Should run with Python 2 and 3. It's not very flexible with the accepted format, but it should be OK with most files. It's not very thoroughly tested. If there is a problem, please report it to me.
Great, thanks a lot for sharing. I will definitely give it a go!
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Re: PC98 Core

Unread post by nsm »

I'm a complete newbie to the PC98 and really to MiSTer in general. Here are some notes on the thread, and the setup that worked for me. I don't like BBCode so the notes are plaintext.

Code: Select all

===== CORE SETUP =====

* I used Mr. Fusion for my SD setup: https://github.com/MiSTer-devel/mr-fusion
    * The root of the SD card contains a _Computer folder. This is where the
    .rbf file for the PC98 core (Zet98) goes.

* The core's author, puu, posts updates to the core on his blog:
http://fpga8801.seesaa.net/ * The cores are posted here as Quartus II .qar
archives. They can be extracted by using https://github.com/makigumo/unqar *
tontonkaloun has also been posting zip versions for download. As of writing, the
latest one is attached to this post:
https://misterfpga.org/viewtopic.php?f=36&t=167&p=18662#p18662

===== BIOS =====

* If you just want to get going with the core, download tonton.rar attached to
this post: https://misterfpga.org/viewtopic.php?p=18850#p18850
    * Inside is a script named mkrom.sh and a file named Zet98.rom. Ignore the
    script. Rename Zet98.rom to boot.rom. Place into YOUR_SD/games/Zet98.
    Alternatively, place into YOUR_SD/bootrom/Zet98.rom. * The core should boot
    to a black screen. OSD should work via F12. You know it's working if you
    hear some beeps.
	
Detailed info on the BIOS:

* In puu's post for the first release of the core
(http://fpga8801.seesaa.net/archives/20210107-1.html) he mentions that the core
requires a boot.rom file, which is a catenation of the BIOS, ITF (unsure what
this is), and fonts. These files refer to bios.rom, itf.rom, and font.rom files
which are typically found in PC98 BIOS dumps I've found. Specifically, those are
the files present in the Neo Kobe PC98 archive's BIOS files.
* There has been some discussion on what model PC98 BIOS is required. See:
https://misterfpga.org/viewtopic.php?p=15766#p15766
    * From what I can tell, none of the BIOS included in the Neo Kobe archive are
    appropriate. I tried making the BIOS myself as per the mkrom.sh file with a
    few different models, but to no avail. Whatever BIOS tontonkaloun used to 
    make his Zet98.rom works. I didn't see any mention of specifically what
    model that file was generated from.

For reference, my Neo Kobe archive contains BIOS for the following models:

Epson PC-486HX
Epson PC-486MU
NEC PC-9801 (unknown model)
NEC PC-9801-86 Sound Board
NEC PC-9801UX NEC PC-9821 (unknown model)
NEC PC-9821Ce2
NEC PC-9821V13 NEC
PC-9821V20 YM2608 (OPNA) rhythm samples

===== CONVERTING GAMES =====

According to https://46okumen.com/pachy98/, there's a LOT of disk formats PC98
games can be found in. The only format I care about is .hdm, the format the ROMs
in the Neo Kobe archive are distributed in.

* We need to go from HDM to D88 for this core. Let's take Albion - Domino
Soldier from the Neo Kobe archive as an example. The files are:

Albion - Domino Soldier [FD].zip
    * Albion - Domino Soldier (Disk A).hdm
    * Albion - Domino Soldier (Disk B).hdm
	
* The [FD] means Floppy Disk. Some games also have an [HD] archive, for Hard
Drive. From reading the thread, it seems people have only had success running
the floppy disk versions of games.
    * wark91 seems to confirm only floppy versions work at the moment:
    https://misterfpga.org/viewtopic.php?f=36&t=167&p=19139&hilit=hdf#p19139
	
* To convert the HDM files to D88, I used an ancient piece of software called
Virtual Floppy Image Converter running in a Win2K virtual machine:
https://www.vector.co.jp/download/file/win95/util/fh212773.html
    * Open it. Check "EXPORT FOLDER" and provide a path to export the D88 file
    to. set "FORMAT" to "D88 format". Drag the HDM file in the box that says
    "Drag & Drop File(s) Here to Convert"
    * Copy the Albion - Domino Soldier (Disk A).d88 and Albion - Domino Soldier 
    (Disk B).d88 files to YOUR_SD/games/Zet98 or wherever.

A couple side notes:

    * Relying on VFIC seems prone to breaking in the future. Someone rewrote a
    couple conversion tools in Python:
    https://github.com/barbeque/pc98-disk-tools
        * We can't go directly from HDM to D88 using these tools. However, going
         from HDM to FDI then using pgimeno's FDI to D88 script
         (http://www.formauri.es/personal/pgimeno/misc/converters.php) might
         work. I haven't tried it. It would be great to have a direct converter
        independent of VFIC.

===== RUNNING GAMES =====

* Boot to the Zet98 core. As mentioned above, if it successfully boots, you'll
get a black screen but hear a few beeps. If you wait long enough DOS(?) will
load, but you don't need to wait.
* Hit F12, go to FDD 0 *.D88 and load Disk A of Albion. Do the same for FDD1 and
Disk B.
* Hit Reset.
* Wait for a while, it takes a moment to boot. Some text from DOS will show up
after a while and continue booting the game.

===== TROUBLESHOOTING =====

* Some games (Rusty) will display a message telling you to flip DIP switch 2-8
to 2.5MHz in order to run. In that case, hit F12 and scroll to the bottom to
toggle it. Additionally, some games will look visually messed up
(duplicated/misaligned image) but WILL NOT provide the warning Rusty does. The
fix is the same: switch to 2.5MHz.
* In general, having the DIP switches set to what puu recommends is probably a
good idea:
https://misterfpga.org/viewtopic.php?f=36&t=167&p=16251&hilit=DIP1#p16251

DIP1-8 Extend
DIP1-3 Normal
DIP2-1 1
DIP2-2 Basic
DIP2-3 80
DIP2-4 25
DIP2-5 Keep
DIP2-6 Connect
DIP2-7 Control
DIP2-8 2.5MHz

===== OTHER NOTES =====

* On my PVM (supports up to 1080i), I'm unable to get a good image unless
vga_scaler is set to 1. I don't know why this is, as supposedly the PC98 runs at
640x400. Without this on, some games display only a dark green color, and in
general the brightness seems to be screwed up. With the VGA scaler on they look
fine... unfortunately, without scanlines!
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Re: PC98 Core

Unread post by pgimeno »

nsm wrote: Sat Apr 24, 2021 7:46 pm

Code: Select all

    * Relying on VFIC seems prone to breaking in the future. Someone rewrote a
    couple conversion tools in Python:
    https://github.com/barbeque/pc98-disk-tools
        * We can't go directly from HDM to D88 using these tools. However, going
         from HDM to FDI then using pgimeno's FDI to D88 script
         (http://www.formauri.es/personal/pgimeno/misc/converters.php) might
         work. I haven't tried it. It would be great to have a direct converter
        independent of VFIC.
Fair enough. I've added it to the converters page. Direct link: http://www.formauri.es/personal/pgimeno ... hdm2d88.py

HDM turns out to be the simplest image format: raw sector data in order, like typical MiSTer VHD for example, so this converter was quite quick to write. I haven't tested it thoroughly, so please let me know of any problems.
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Re: PC98 Core

Unread post by nsm »

pgimeno wrote: Sun Apr 25, 2021 1:10 am
nsm wrote: Sat Apr 24, 2021 7:46 pm

Code: Select all

    * Relying on VFIC seems prone to breaking in the future. Someone rewrote a
    couple conversion tools in Python:
    https://github.com/barbeque/pc98-disk-tools
        * We can't go directly from HDM to D88 using these tools. However, going
         from HDM to FDI then using pgimeno's FDI to D88 script
         (http://www.formauri.es/personal/pgimeno/misc/converters.php) might
         work. I haven't tried it. It would be great to have a direct converter
        independent of VFIC.
Fair enough. I've added it to the converters page. Direct link: http://www.formauri.es/personal/pgimeno ... hdm2d88.py

HDM turns out to be the simplest image format: raw sector data in order, like typical MiSTer VHD for example, so this converter was quite quick to write. I haven't tested it thoroughly, so please let me know of any problems.
Hey, this is excellent! I will give it a go tomorrow. Since the archival files for PC98 seem to be distributed in HDM due to the reasons you mentioned, I think a script like this will really help in preserving the platform. Cheers.
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Re: PC98 Core

Unread post by saibayadon »

First of all, thanks puu for the hard work. It's incredible that this is already booting games.

I've set up everything and have managed to run some games. CRW (with the English patch) is booting perfectly when using D88 and loading both A and B disks. Chitty Chitty Train errors out with a "I/O Error" and a constant beep when trying to boot it. I'll continue testing games I have.

One thing I've noticed, and this may be my setup, is that the keyboard input stops working after a short amount of time or doesn't work at all. I booted the DOS disk someone shared here and was able to issue some commands and type for a short while and then it gets stuck. Has anyone seen a similar thing?

1QjSqTM.png
1QjSqTM.png (448.6 KiB) Viewed 37556 times

Are there any plans to support hard drive images ala VHD? It'd be very useful to be able to load something like https://nfggames.com/forum2/index.php?topic=5463.0
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Re: PC98 Core

Unread post by ShyTalk »

Alkadian wrote: Mon Feb 22, 2021 10:36 am
wark91 wrote: Sun Feb 21, 2021 7:11 pm Ok.
You just load the first floppy or did you reset ?
The reset doesn't seem to work correctly.
The only way I have found to work every-time after tested the floppies on emulator is :
- Restart the Mister
- Start the core Zet98
- Load the first floppy
@wark91,

Many thanks for your help, I got it working at the end!
Hi, Do you mind confirming how you got this to work in the end? I seem to be stuck at the same point as you but I can't seem to crack this:

1. I have my 5 Rusty .d88 files (Game disks A, B, C, Opening, System);
2. I run the core;
3. Ensure that the core settings are "standard";
4. I bring up the OSD and select "FDD0 *.D88 and select Rusty (System Disk);
5. I bring up the OSD again and select "FDD1 *.D88 and select Rusty (Opening Disk)
6. I click Reset and the Game System Disk seems to begin to load;
7. After a few moments the screen just goes blank

Have I missed something or could it be my Neo Kobe version of the roms do you think?

Thanks for any assistance!
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Re: PC98 Core

Unread post by Alkadian »

ShyTalk wrote: Mon May 24, 2021 9:03 pm
Alkadian wrote: Mon Feb 22, 2021 10:36 am
wark91 wrote: Sun Feb 21, 2021 7:11 pm Ok.
You just load the first floppy or did you reset ?
The reset doesn't seem to work correctly.
The only way I have found to work every-time after tested the floppies on emulator is :
- Restart the Mister
- Start the core Zet98
- Load the first floppy
@wark91,

Many thanks for your help, I got it working at the end!
Hi, Do you mind confirming how you got this to work in the end? I seem to be stuck at the same point as you but I can't seem to crack this:

1. I have my 5 Rusty .d88 files (Game disks A, B, C, Opening, System);
2. I run the core;
3. Ensure that the core settings are "standard";
4. I bring up the OSD and select "FDD0 *.D88 and select Rusty (System Disk);
5. I bring up the OSD again and select "FDD1 *.D88 and select Rusty (Opening Disk)
6. I click Reset and the Game System Disk seems to begin to load;
7. After a few moments the screen just goes blank

Have I missed something or could it be my Neo Kobe version of the roms do you think?

Thanks for any assistance!
Hi there,

I have just double checked the files again and they still run fine on my side. I can confirm that I have used the Neo Kobe version as well and I have used the very handy pgimeno converter tool to convert the .hdm. to .D88. This tool really works like a charm, as all his other converters!

I don't see anything wrong in your steps. Please make sure you have got the correct/recommended settings:

DIP1-8 Extend
DIP1-3 Normal
DIP2-1 1
DIP2-2 Basic
DIP2-3 80
DIP2-4 25
DIP2-5 Keep
DIP2-6 Connect
DIP2-7 Control
DIP2-8 2.5MHz

Other than that I cannot think of anything else. Please let me know how it goes.
JsonOne
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Re: PC98 Core

Unread post by JsonOne »

Has there been any update on getting hard disks working? Some of the bigger games aren't on floppy disks
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Re: PC98 Core

Unread post by Moondandy »

Hey guys, I was wondering what the status of this core is now? Is the source code available anywhere? Has anyone picked it up now Puu has moved onto FM Towns?
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Re: PC98 Core

Unread post by Milspex »

saibayadon wrote: Mon May 24, 2021 6:04 am I've set up everything and have managed to run some games. CRW (with the English patch) is booting perfectly when using D88 and loading both A and B disks. Chitty Chitty Train errors out with a "I/O Error" and a constant beep when trying to boot it. I'll continue testing games I have.
Can someone drop these D88 patched files on archive or someplace please? :oops: (hint hint Dead of the Brain english patched)

Also imagine the possibilites if this core could read hdm / hdi / fdi file types. Unlock all..

Also, maybe this is of any help https://www.romhacking.net/utilities/1616/
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Re: PC98 Core

Unread post by teller »

Did somebody get the english-patched version of 46 Okunen Monogatari - The Shinkaron (E.V.O. - The Theory of Evolution) to work?
I converted the .hdm-files to .d88 with Virtual Floppy Image Converter and the game boots but after ENIX PRESENTS there is s black screen. I also checked it unpachted, same issue.
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Re: PC98 Core

Unread post by softtest9 »

Is the floppy code on the FPGA or ARM side? If it's on the ARM side, perhaps a software developer could take a look. Emulators generally support multiple formats and some of them are open-source.
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Re: PC98 Core

Unread post by puu »

softtest9 wrote: Sun Jan 09, 2022 11:28 am Is the floppy code on the FPGA or ARM side? If it's on the ARM side, perhaps a software developer could take a look. Emulators generally support multiple formats and some of them are open-source.
FDD code is on FPGA.
The ARM side only inputs and outputs files, and the FPGA expands the .d88 image to the track image.
The .d88 format is used because it can handle formats where the sector size is different for each track or there are multiple size sectors in the track.
Elrinth
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Re: PC98 Core

Unread post by Elrinth »

How do you get this core running?

I put the Zet98_20210217.rbf in the /fat/media/_Computer folder and I made a /fat/media/games/zet98/ folder... then what?

I only get a black screen.

I got help in the discord... Seems the file you need is the one posted by tonton earlier...
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Re: PC98 Core

Unread post by nero81af »

Hi There,
First of all great job mr. Puu! I was playing around with pc98 core but the three games that I'd like to play do not work.. what can I do to help out? I'm a c++ coder only :( the three games are

dragon slayer: the legend of heroes
dragon slayer: the legend of heroes II
snatcher

My setup should be ok.. I can boot the dos disk!
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Re: PC98 Core

Unread post by davidpgil »

Just started to get interested in Mister because of PC98 -- following.
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Re: PC98 Core

Unread post by davidpgil »

... I JUST ordered a Mister morning after reading this thread. I love retro hardware but some of these old systems didnt really think about the historical preservation aspect and buying a fully compatible PC98 "system" can be quite expensive, just to be able to play games. I recently became osessed with trying to get into PC98 and now I can with Mister!
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Re: PC98 Core

Unread post by TimeWarpGamer »

pgimeno wrote: Mon Feb 22, 2021 10:04 am Since I can't run that disk tool, I made a converter from FDI to D88 in Python, based on my previous DIM to D88 converter. Usage is:

python fdi2d88.py <input file> <output file>
Huge props for the Python script. Thanks so much for sharing. First try it worked great, then I tried Hellhound and Phalanx .dim files and got an error: "raise Exception('Data present in a track number not supported by D88, aborting'). I guess some .dim games cannot be converted to .d88?
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Re: PC98 Core

Unread post by pgimeno »

TimeWarpGamer wrote: Sun Mar 27, 2022 8:38 pm Huge props for the Python script. Thanks so much for sharing. First try it worked great, then I tried Hellhound and Phalanx .dim files and got an error: "raise Exception('Data present in a track number not supported by D88, aborting'). I guess some .dim games cannot be converted to .d88?
These are for X68000, right? I can't reproduce the problem you're running into; maybe you need to redownload the tool? (check my sig)

Or maybe you were trying to use FDI2D88 to convert DIM files? Note that each file type needs a different converter. For DIM files you need to use dim2d88.py.
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Re: PC98 Core

Unread post by JsonOne »

puu wrote: Thu Jan 13, 2022 8:58 am
softtest9 wrote: Sun Jan 09, 2022 11:28 am Is the floppy code on the FPGA or ARM side? If it's on the ARM side, perhaps a software developer could take a look. Emulators generally support multiple formats and some of them are open-source.
FDD code is on FPGA.
The ARM side only inputs and outputs files, and the FPGA expands the .d88 image to the track image.
The .d88 format is used because it can handle formats where the sector size is different for each track or there are multiple size sectors in the track.
There is some issue with the keyboard controller, holding down a key other than shift for more than a second will cause the computer to freeze. Using de0cv version, the address lights on 7 seg are stuck too when this happens.
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Re: PC98 Core

Unread post by Madnar »

saibayadon wrote: Mon May 24, 2021 6:04 am First of all, thanks puu for the hard work. It's incredible that this is already booting games.

I've set up everything and have managed to run some games. CRW (with the English patch) is booting perfectly when using D88 and loading both A and B disks.
Yes, I second thanking puu for the hard work. These Japanese computer cores are the ones I'm interested in trying the most! Have you played CRW at all? I'm trying to play the first level, but the game feels a lot more sluggish than a video of a play through I saw on youtube, which makes it tough for a game with real-time elements. I'm not sure if that's just emulation vs Mister, something I have to configure, or if I should be patient for a more mature core. :)

Also, does anyone have the Dead of the Brain translation working properly? The game is running on my end, but the text is gibberish. It's not English or Japanese. If I remember, maybe there are vertical lines over the entire screen, too (like jail bars).
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Re: PC98 Core

Unread post by Madnar »

Hey, I'm trying to see if I can create a SASI HDF file from the neko project II emulator. Can any of the below HD types be converted? Or is there some other way to create this type of HD?

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Re: PC98 Core

Unread post by puu »

Unfortunately PC-98core does not yet support HDD.
Because in the PC-98 of the 8086 CPU era, the HDD was SASI or SCSI, but there are many types of host adapters including third parties, and the SCSI on hand is made by a third party and only a limited number of people can obtain the BIOS for this. Also, I don't have a genuine NEC SASI / SCSI host adapter, so I can't get the BIOS.
Later, the IDE was installed in the PC-98, but by that time the CPU was already in the 486 era, and the DISK BIOS is included in the system BIOS, but the CPU of this core uses instructions that cannot be used in the 8086. Cannot be executed.
However, I cannot support it because I do not have the ability to create a SASI / SCSI BIOS.
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Re: PC98 Core

Unread post by aberu »

I think a few computer cores bypass this or they have a patched BIOS to get around this problem as a workaround. @sorgelig has offered to help with something similar for the upcoming PC-XT core, maybe he can give some advice or help with this too.
birdybro~
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Re: PC98 Core

Unread post by JsonOne »

puu wrote: Fri Jul 29, 2022 4:20 pm Because in the PC-98 of the 8086 CPU era, the HDD was SASI or SCSI, but there are many types of host adapters including third parties, and the SCSI on hand is made by a third party and only a limited number of people can obtain the BIOS for this. Also, I don't have a genuine NEC SASI / SCSI host adapter, so I can't get the BIOS.
I might have discovered a solution for this check your PMs messages!
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Re: PC98 Core

Unread post by Jegriva »

Hi, does this runs also on consumer CRT?

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Re: PC98 Core

Unread post by akeley »

Jegriva wrote: Thu Nov 02, 2023 6:09 pm

Hi, does this runs also on consumer CRT?

I can get a stable image using modelines from PC-88 (which in turn were borrowed from ao486) , but it's squashed - even after applying 16:9 ratio.

On PC-88 it's the same, but this core has the Aspect Ratio: Full Screen option which helps to alleviate this problem.

Try at your own risk:

Code: Select all

[Zet98]
direct_video=0
vga_scaler=1
vsync_adjust=2
vscale_mode=3
video_mode=1280,159,140,248,240,11,0,19,29568
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Re: PC98 Core

Unread post by Newsdee »

Does anybody have a list of game recommendations that work on the current pc98 core?

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