This is the world's largest site for Signetics-based machines; specifically:

Emerson Arcadia 2001 console family (c. 1982);
Interton VC 4000 console family (c. 1978);
Elektor TV Games Computer (1979);
PIPBUG- and BINBUG-based machines (1977-1978);
Signetics Instructor 50 trainer (1978);
Signetics TWIN minicomputer (1976);
Central Data 2650 computer (1977);
PHUNSY computer (c. 1980);
Ravensburger Selbstbaucomputer aka 2650 Minimal Computer trainer (1984);
Hofacker MIKIT 2650 trainer (1978); and
Malzak 1 and 2 and Zaccaria coin-ops (c. 1979-1981);