The Lexmark ML186 Plus dot matrix printer is a 9-pin printer.
Get the spec sheet for more details.
ML 186Plus – Parallel, USB P/N: 62448501
ML 186Plus – Serial, USB P/N: 62448601
ML 186Plus Black – Parallel, USB P/N: 62448701
ML 186Plus Black – Serial, USB P/N: 62448801