Industry Standard Architecture (ISA) bus

(see http://www.techfest.com/hardware/bus/isa.htm) ISA (Industry Standard Architecture) bus:

• originated early 1980s at IBM development lab in Florida.
• original IBM Personal Computer 1981 had 8-bit subset of ISA bus.
• 1984, IBM introduced PC-AT: first full 16-bit implementation of ISA bus.

ISA bus timing and signal descriptions