Computing term for a printer that prints an entire line at a time, typically used in mainframe or batch processing contexts.
A high-speed line printer was connected to the mainframe.
プリンター is the general term for any printer, while 行印字装置 specifically refers to a line printer, a type of impact printer that prints one entire line at a time.
Compound of 行 (line), 印字 (printing), and 装置 (device). A straightforward technical term with no obscure historical derivation.