PDP-8L Maintenance Manual(PDF). Maynard Mass.: Digital Equipment Corp. 1970. Archived(PDF) from the original on 2015-04-22. Retrieved 26 December 2019.
PDP-8L Maintenance Manual(PDF). Maynard Mass.: Digital Equipment Corp. 1970. Archived(PDF) from the original on 2015-04-22. Retrieved 26 December 2019.