The S-100 (later the IEEE696) bus is a backplane standard introduced in 1975 supporting configurable card types.
For questions regarding the S-100 interface bus.
The S-100 bus is an 8-bit backplane standard introduced in 1975 supporting configurable card types. Several processor, interface and memory cards are/were available.
The bus evolved into a 16-bit version and gained IEEE standardisation as the IEEE696 bus.