Install on the FM-1

Over USB, from this page, in Chrome or Edge. Each is its latest release, checked against GitHub's SHA-256 of it and its own checksums before anything is sent. Each is a whole firmware: installing one replaces the one on the FM-1. Back to any other, or to the official one, with the FM-1 Firmware Hub.

fm1-dock

One firmware, many synths: CS-1, Scintilla, OberVave and a sine as modules, picked with HOME; your own deploy over USB. More.

Then add FM-1 SID to it, as a module next to the others:

Or Charles Vestal's AMB-1 (generative ambient) and FoMni (a chord harp), ported unchanged; both fit beside each other, not beside FM-1 SID:

FM-1 SID

A Commodore 64 SID on the FM-1: C64 tunes on a 6510 and reSID, a GoatTracker 2 editor and a SID synth. More. As a firmware of its own here, or added to fm1-dock (above).

Scintilla

The 1981 Elka Synthex: all 80 factory sounds, the laser harp among them. More.