Apple released the Dot Matrix Printer in 1982 for the II and ///, and heavily advertised it as an add-on for the new Lisa in 1983. The DMP was followed up by the ImageWriter.
The user reference manual is Part I of a two-part set. Part II was branded individually depending on which computer it was sold with and each version contained instructions for a specific computer, for example “Apple Dot Matrix Printer User’s Manual for the Apple Lisa”.
I don’t currently have any version of Part II, but will scan and post if and when I can obtain them.
The Operator’s Guide is a 40-page quick-set up booklet containing instructions for the II and ///, but not the Lisa, and included a Demo Diskette to test the hardware after it had been installed.
A disk image of the demo floppy is available here: Download