HP 1200 HP PCL/PJL reference - PCL 5 Comparison Guide - Page 137

Note Negative Motion Command The Negative Motion command specifies whether negative motion will be used, thus determining whether the full page must be buffered before printing can begin. ?&a#N # = 0 - Picture contains negative motion (page formatting printers) 1 - Picture contains no negative motion (swath printers) Default = 0 Range = 0, 1 If the page contains no negative motion, using the ?&a1N command increases print speed. Negative motion includes: • Vertical motion toward the top of the page • HP-GL/2 operations • Print directions other than 0 degrees • Landscape text • When the top of the character cell on the next line is above the top of the character cell on the current line The default value of 0 delays printing until all the processing of input data for a page is complete. This is for software that needs to compose the data before printing. A value of 1 allows data to be printed as received, rather than first stored in a buffer. Otherwise, printing will be delayed until all processing of input data is complete. This command must be sent before any printable data is received by the printer. ENWW Printer-Specific Differences 2-89