ascii

PS/2 Keyboard to Parallel Adapter Older machines and single-board computers, particularly ones from the mid-to-late ’70s through the very early ’80s often used a parallel keyboard input. It was very common during this time for a hobbyist to ‘roll their own’ system with parts from different sources. Keyboards with a 7 or 8 bit parallel ASCII output were available from several sources, but are no longer manufactured. Occasionally you will see one on eBay, but usually for an exorbitant price.