Neither. The game's own 68000 code from your disks is translated ahead of time into C and WebAssembly (static recompilation) and runs natively in the browser. The Amiga chipset, bus timing, Copper, Blitter, bitplanes, sprites, Paula, is a model checked against the vAmiga emulator. No processor is emulated at run time and no game logic has been rewritten by hand.
VRR removes the judder of 50 Hz on a 60 Hz screen, and for the Original mode that is a fine solution. But the game's main loop still moves its objects 25 times a second (the camera 50) and the window is still 330 pixels wide. The Enhanced mode interpolates the camera and the objects between game frames and draws a wider view from the game's own data, which no emulator setting can do.
Smoothing needs to know the next game frame before it can draw the step in between, so in Enhanced mode the camera is drawn about one game frame (20 ms) later. Exact numbers for the published build will follow once I have measured it.
The commonly preserved dumps of the Amiga 500 version (the Fairlight release, with and without trainer), disks 1 and 2 as .adf; the page unlocks by the game's files on the disks, not by one exact image. An original retail disk has not been verified yet: if you own one, please write to me. The AGA version is not supported. The page tells you when a disk is not recognised. Each image below was started on the public build and reached level 1 (TOSEC names and the first 16 hex digits of their SHA-256):
| image (TOSEC name after "Alien Breed II - The Horror Continues (1993)(Team 17)") | SHA-256 |
|---|---|
| [cr FLT](Disk 1 of 3) | fda8d13cc4077beb… |
| [cr FLT](Disk 1 of 3)[a] | d21d472555553888… |
| [cr FLT](Disk 1 of 3)[t +7 Backlash] | cb847dd10f0b6e3c… |
| [cr FLT](Disk 1 of 3)[t +15 ZNT] | aba0f9402cbb9dcb… |
| [cr FLT](Disk 1 of 3)[t +25 INS] | 3bdba12d15705267… |
| [cr FLT](Disk 1 of 3)[t +30 GOD] | aaf685378adb8499… |
| [cr FLT](Disk 2 of 3) | 30ab30957ba36e68… |
The rebuild runs the whole game. The Enhanced view, though, is tuned and checked level by level: the wider window, the earlier activation of objects and the sound routing all depend on how each level is built, and levels 1 and 2 are the ones that are done. The later levels run, but I have not played them through myself yet and would rather not show them until they are finished.
No game data: no graphics, levels, music or code listings. The code derived from the game and its start state are encrypted and unlock only with a key derived from your own disks. Your disk images are checked in your browser and never uploaded.
It drives the kit: reads the disk, finds the loader and the packers, translates routines, runs the rebuilt code against the original in an emulator and compares memory, picture and sound. The rule is measure, never guess: nothing is accepted that is not equal to the original. The AI does not generate graphics, levels or code of its own; everything on screen comes from your disks.
Alien Breed II and Superfrog belong to Team17. AREK is a free fan project that ships no game data, no disk images and no Kickstart ROM; you need to own the game. If you represent the rights holder and have any concerns, please write to me first; I will respond.
Superfrog (Team17, 1993). Suggestions are welcome in the GitHub discussions.