I added toykyle's info about the debug menu to TCRF (a great website that catalogs unused stuff in games as well as things like debug menus): https://tcrf.net/Galaxian_3_(PlayStation)

I'm not sure what the Tune LVL, Success and Entry options do. I thought Success would affect something related to the Cannon Seed destruction but it doesn't. The Super blaster though is amazing and makes the game a lot easier (almost too easy, I blew up the spark bits in Project Dragoon before the camera began to focus on them)

http://ks23364.kimsufi.com/psxdata/databasepsx/games/P/S/SCES-01707.html Here's a listing on PSX DataCenter, there's even screenshots of the dialogue in English.

There hasn't really been a thread on this game, which I think deserves a mention as it is part of the UGSF timeline and contains Galaxian^3 stuff.

Star Ixiom is a PS1 game, it only came out in Japan and Europe (much like G^3's port) and it's a sort of evolution of the old Namco game Star Luster except it involves the whole of UGSF and multiple UGSF "universes", specifically Galaga, Galaxian, Gaplus, Bosconian, Starblade, Star Luster and of course G^3. The Dragoon J2 and Geo Sword are selectable ships and enemies from G^3 and Starblade make appearances alongside old Galaxian/Galaga/Bosconian enemies and battleships. Zolgear even makes an appearance!

http://www.youtube.com/watch?v=6eM_GqBnq-s

This is the intro video, you can see the Geo Sword in action along with the Gaia Ʃ from Star Luster and the Galaxip from Galaxian. The game itself seems to be a bit rough but it has some nifty music (including an orchestral version of the Galaga music!) and the ships are rendered quite nicely.

It looks like you cannot even download the mod anymore because the site hosting the files is closed. 

Gearbox Software recently acquired the rights to Homeworld from the THQ auction (they shut down at the beginning of this year) and I'd love to try this mod whenever they get to releasing Homeworld 2 digitally, but I guess it's faded into the ether unless the dev is working very hard on it (which I can understand, some mods take a very long time)

I was looking at the website that the GH-28 scans were linked from before, and its homepage has a timeline for the UGSF "universe"! 

http://ugsf-series.com/

If this timeline is correct, the events of Project Dragoon predate Galaxian and Galaga...and the last part of the timeline is the obscure Namco rail shooter Thunder Ceptor. Ace Combat 3 Electrosphere is also a part of this too. Shame the US version omits all the story though...

One has to wonder if Namco will expand this timeline in the future, maybe with new games?

That Pac-Man machine looks like the Champion Edition that you can get off XBLA.

I tried the EU version on ePSXe and it is indeed slow. It was nice hearing the English voices, especially in Gourb (the commander sounds so stern) but the dropped frames made it quite choppy.

Yay, it's on the fast track to emulation!

Does MAME handle most Laserdisc games well? I know 3D games are pretty demanding when it comes to CPU...