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Excitebike GS

Year	2026
Publisher	Lucas Scharenbroich (silky-gs)
Developers	Lucas Scharenbroich (IIGS port); Nintendo (original, 1984)
Control	Keyboard, Joystick, SNES MAX
Other Requirements	GS/OS. 800K data disk, not bootable: mount it next to a System 6 boot disk and launch ExciteBikeGS from the Finder. Also a folder on the SilkyGS port pack volume.
System 6 Compatible	Yes
Hard Drive Installable	Yes
Release Status	Free download (the port, Apache-2.0 source); the game itself is copyright Nintendo

About

Excitebike is the 1984 motocross game: five tracks, four lanes, a temperature gauge that punishes too much turbo, and a design mode for building a track of your own. Selection A races the clock alone and Selection B puts other riders on the track.

It is one of the eleven games in the first SilkyGS port pack (v0.0.1, 24 October 2026; updated to v0.0.2 on 26 October) by Lucas Scharenbroich. silky-gs is not an emulator. Each game's 6502 code is disassembled, converted to Merlin32 source and patched by hand so it runs natively on the 65816; the runtime stands in for the NES hardware, catching the PPU and APU register writes, drawing the screen to Super Hi-Res with compiled tiles and sprites, and playing the two pulse channels, triangle and noise on the Ensoniq. The DMC sample channel, sprite 0 hit and mid-frame raster tricks are not implemented; the split-screen status bars get a per-game render routine instead. Scharenbroich's own description is of a code lineage unbroken since 1998 that started using AI tools in 2026.

Default keys: arrows for the d-pad, Apple (Command) for A, Option for B, Return for Start and Tab for Select; player 2 has W A S D, Control and Shift. A joystick and the SNES MAX card are supported too. ? opens the configuration screen (audio update rate, FPS counter, fast blit, key map, joystick calibration, keyboard driver), R resets the game, Q quits. Buttons can be remapped on keyboard and joystick since 0.0.2, which also fixed the 0.0.1 keyboard problem where button presses interfered with the arrows and could lock up a real machine. Settings are saved in a .prefs file next to the application. The 800K disk below holds the one S16 file, a README and its icon; mount it next to a GS/OS boot disk and launch it from the Finder, or install it on a hard drive. The same program is a folder on the SilkyGS port pack volume.

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