HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 343
I/O, User's Manual
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Note The page protection feature is available only with additional optional memory on many HP LaserJet printers. (One exception is the LaserJet 4 printer, which supports page protection for letter-size paper in 300 dpi mode with the standard 2 Mbytes memory.) Refer to the appropriate User's Manual for specific memory requirements. The Page Protection feature can be used to prevent possible ERROR 21 conditions. ERROR 21 is reported when data is too complex for the printer to process concurrent with actual physical printing. A frequent cause of ERROR 21 when printing graphics is that the program sends commands to print a single point many times during the page run. Page protection can be set for letter, A4, or legal sized pages. Set page protection for the page size most often used. I/O The Parallel (Centronics) I/O has higher throughput than the RS-232C serial I/O. While text processing may not benefit from a faster I/O, raster graphics processing and soft font downloads will usually benefit from increased I/O throughput. EN Performance 24-11