CHK11 Reference Manual

The CHK11 reference manual provides instructions and troubleshooting information for using the CHK11 hardware test module. This module performs an initial hardware survey of PDP-11 communications systems (such as the DAS series, DN series, etc.) to ensure that critical devices and memory are functioning correctly. The document covers the test process, how to interpret error messages and stop codes (which may be displayed on console data lights if no terminal is available), and details specific error messages for various supported devices like CR11, DH11, DL11, and others. It is intended for personnel loading these systems.