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Actually, the one you want is "MAME 0.168 Software List ROMs", which is about 50 GB. There is no software list for PC-98 CDs (yet).

Yeah I know, but thanks anyway.

Is it possible the CHD torrent is incomplete?
I'm looking for Assault Suits Leynos 2 (aleynos2), nifty game, had an import copy for my modded Saturn. It appears it's not in the torrent.

The torrents are based on the software lists; they contain exactly what's in the lists, no more, no less.

You can also choose files with the ones on archive.org, just add a / to the end of the .zip download URL to get a file listing.

I'm trying to load a chd image I made from an hdi file in mame but am having issues. The command I used to convert the hdi file is this:

chdman createhd -i Night Slave.hdi -o nightslave.chd

As you can tell the game is night slave. Now when trying to launch it in mame, I use this command:

mame64.exe pc9821 -ide:0 hdd -hard roms\nightslave.chd

However this just gets me dumped into the bios and doesn't launch the game. Does anybody here know how to launch games from the hard drive? It shows that the chd file is loaded in the hard drive in the menu and I have IDE bios loaded YES in the machine configuration.

If you're sure the image is bootable and you're getting the ROM BASIC prompt then most likely chdman needs the disk image geometry (-chs).

As R. Belmont said earlier in this thread, it's easier to just obtain the softlisted version of the software.

By the way, Night Slave doesn't work yet.

It does work when booted from an HD image although the cutscene graphics are cut off and the music stops after a while. The softlist image isn't bootable and I've no idea how to start it.

There is a softlist image of the hdi? All I see in the software list roms is a nightslv.zip which is a compilation of fdi images. I'm guessing you would have to use those to install to a blank hdd? Is that how you got yours working? The softwarelist chd roms only list pcecd.

You need to install/hot-swap* DOS 6.22, then use hdinst.exe inside Night Slave disk 1. If somebody wants to do a full tutorial about how to install stuff on pc98xx be my guest.

* Hot-swapping: run MS-DOS disk 1, wait until it prompts you to install DOS on a disk, press ESC in FULL keyboard mode then ENTER at はい for はい / いいえ (Yes/No).
(now at pc98xx prompt): change disk A into <select_your_game_running_only_on_dos> disk A, "dir *.exe" or "dir *.bat" for a list of executable commands. For Night Slave, hdinst.exe is the installer, nsg.exe is likely raw executable but it fails if not from HDD apparently.