These images are greyscale. If you wish to OCR them, you may need to convert
them to monochrome (called duotone in Photoshop CS).

These images were scanned in 2004 by Calvin Culver from his copy of "ZCPR3 and IOPs: A Tutorial on Input/Output Packages for the ZCPR3 System", copyright 1985 by Richard Conn.

The original manual was printed on letter-sized (8.5x11") manilla paper. The front and back pages (the covers) were printed on slightly heavier light brown stock. It was stapled in two places along the left. The color of the pages appears to my eyes to be
close to Pantone 156U (R144 G190 B144 - as shown in Photoshop CS), or perhaps 148U (R255 G197 B140). The front and back covers appear close to Pantone 4645C (R177 G127 B92) or 729C (R195 G142 B99).