On Thu, Jul 31, 2025 at 01:38:15 +0100, mick.crane wrote: > serial console/ parallel is likely me not understanding terminology. > These Raspberry Pis, Arduinos with the connection with all the pins, what > protocol is that expecting?
A serial cable usually has a 9-pin (DB-9) connector on each end. A parallel cable usually has a 25-pin (DB-25) connector on one end, and either another DB-25 connector or a mini-Centronix connector on the other end. See pictures at <https://en.wikipedia.org/wiki/Parallel_port>. Typically, parallel ports have been used for printers. The Iomega Zip drive also had a parallel port interface, but wasn't super popular. Serial ports have commonly been used for teletypes/terminals, mice, and a wide variety of other instruments and devices.
