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Dos.zip contains a build of Sonic Mania for DOS (RSDKv5.exe) using Allegro4 for video, audio and input.
The datafile should be named Datarsdk.bin and not Data.rsdk, and should be in the same directory as the executable
A SoundBlaster 16 compatible sound card should be used, remember to set the BLASTER envinronment variable correctly.

DosWss.zip contains a build of Sonic Mania for DOS (RSDKv5.exe) using Allegro4 for video and input, and WSSAudio for audio.
It supports many (but not all) AC97 and HDA based sound cards, besides SB16.

DosDs.zip contains a build of Sonic Mania for DOS (RSDKv5.exe) using Allegro4 for video and input, and DOSSound for audio.
It supports many AC97 sound cards, besides SB16.
You need to start the TSR (dossound.com) first before running Sonic Mania.
If your computer has got a SB16 sound card which is assigned IRQ 5, run DosSound with the /I5 argument.

Ideally your computer should have at least a 300Mhz Pentium II, and 32MB of RAM.
There are no real video card requirements as this port will fall back to using the 8-bit VGA 320x200 mode if it can't set a VESA mode.
If you want to use the 320x240 Mode-X video mode, add useVGAMode=2 under video settings in Settings.ini

Color will feel a bit reduced when using VGA modes, but completely playable.

Keys can't be assigned yet.
Buttons are mapped to the A, S, D, Z, X, C, Enter (START) and Space (SELECT) keys.
D-pad is mapped to the arrow keys.

Place Settings.ini in the same directory as RSDKv5.exe

(For DevMenu, add the line: DevMenu=Y
in the Game section)