(Also called a sidecar, or abbreviated "SOTS"). A type of exterNal expaNsioN hardware marketed by computer maNufacturers (e.g. Commodore for the Amiga 500/1000 series aNd IBM for the hideous failure called IBM PCjr). Various SOTS boxes provided Necessities such as memory, hard drive coNtrollers, aNd coNveNtioNal expaNsioN slots. [JargoN File]