Unfinished R-Type (U) PCE/Turbo to SuperGrafx hack by Chris Covell ------------------------------------------------------------------
This hack converts the US TG-16 ROM (unscrambled) of R-Type into a bi-compatible PCE/SGX ROM. On a real SuperGrafx, flicker will be greatly reduced, as the new limit to maximum sprites on-screen will now be 128, as opposed to the TG/PCE's 64.
I've also expanded the screen size to full vertical height on both PCE and SG, so the game no longer needs to scroll vertically. To adjust the vertical screen positioning, pause the game and hold I then press Up or Down.
This was a hacking project that I started in 2011, but abandoned the following year, mostly because I became a father, and thus life got too busy to work on a sustained project like this one.
(Each level has to have its scrolling, raster interrupt, priority logic, etc. etc. hacked individually, you see.)
This hack is unfinished, and "works" to about level 4. It still has a debug invincibility mode that can be activated by pressing Select during gameplay.
This is distributed in the form of an .IPS patch. Apply the patch using IPS patching software to an R-Type(U)ROM, (and rename it from .PCE to .SGX if necessary for emulators/FPGA systems to activate their SGX emulation.)
I assume no responsibility for explosions caused to your hardware etc. etc.
Finally had a chance to get the supergrafx out and tried this out. It was so odd playing R-Type and not having the screen scroll as I moved the ship up and down. I could really tell the difference and the lack of breakup of the sprites was really nice. I still need to go back and play some more of it but thanks again for sharing this. It's nice to have another thing to play on the supergrafx.
Since the turbografx mini can play Supergrafx games I wonder if that means (assuming it does well) we'll see more Supergrafx homebrew. But other than the increased pixel count, is there any benefit making a Supergrafx homebrew game over a regular one?
retina sting resolution quick fix for reduced pixel count
Finally... no longer seeing the world unfold like it was an old Nintendo game.