General Module Structure

Each module contains 8 bytes of header information preceding the data. For the 3800 printing subsystem, the general module header is shown in Figure 1.

Figure 1. 3800 General Module Header

Header information for the 4248 printer FCB module is shown, with the module format, in Figure 1.

The SETPRT macro instruction uses the name to:

Identify the module in the image library.
Save the name to optimize future requests.

The SETPRT macro instruction uses the length to:

Obtain sufficient storage for the module.
Build channel programs to load the data into the printer.