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I'm quite excited about the Pied Piper. Using the ROMs and available schematics, I've rather hastily constructed a preliminary driver that gets to the point where the system beeps and prints "Insert system diskette in Drive."

The ROMs of a prototype ZX Spectrum machine have been dumped and released (and merged into one file, it seems): http://www.computinghistory.org.uk/det/51620/Sinclair-ZX-Spectrum-Prototype/

Two variants of a 1998 PlayStation demo called "Dino 2" have just been compiled from original sources: https://archive.org/details/dino-2-technical-demonstration-1998

Somebody has just uploaded the PC booter games from Demonlord's site over here: https://www.zonadepruebas.com/viewtopic.php?f=59&t=8717&start=30

According to the ibm5150 softlist, some of these had been MIA since the site went down.

And here's the TeraDrive's TMSS ROM for its Mega Drive side, dumped by armadylo:
https://www.mediafire.com/file/ena8lxz28fj2ydd/TERA_TMSS.BIN/file

Also:
Not sure if that one has been dumped already.

Regarding the PC booter demonlord releases, note that even though there's a "cracked or patched" folder, there's also some cracked/tampered dumps outside of it, such as the Alleycat image that's currently in MAME:


And there's also this note inside said folder:


Fortunately, most of them have a "FILE_ID.DIZ" which describes which are the cracked files and which are the originals. For example:


List of games inside that "cracked or patched" folder which are currently in MAME:
-decathln
-ghostbst
-mastodon
-tapper
-tapperc

yeah those need tagging appropriately then

I have looked at a couple of games where I have flux-level dumps of the originals to compare, and I get the impression that some of those TD0 files weren't very extensively tested. The Atarisoft version of Ms. Pac-Man, for example, is supposed to have two sectors with incorrect headers on track 30, as part of the copy protection, but those sectors are missing entirely in the TD0 file. If you try to play the game, it starts doing some really strange things that make it basically unplayable due to the protection kicking in. A conversion of the original to HxC MFM format works flawlessly, though (and I should really add that to the ibm5150 softlist).

I'm guessing most of the images are probably OK, but some others may still need redumping...

If you have better dumps, please submit them.

Already done

I also dumped a few other (non-booter) PC disks that I'll add later, and I'll have to get back to working on the PC-98 stuff at some point. So much to do, so little time...