HP LaserJet 4 Service Manual - Page 51
I/O Buffering HP LaserJet 4 Plus and 5 only
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I/O Buffering (HP LaserJet 4 Plus and 5 only) I/O buffering allows the user to allocate printer memory to hold the job while it prints, freeing up the host system sooner, like a print spooler. The standard printer has approximately 10 KBytes of memory allocated to I/O buffering and an additional 100 KBytes of memory is assigned to I/O buffering for each 1 MByte of memory added to the printer. If the printer has a minimum of 6 MBytes of memory installed (12 MBytes of memory for a printer with a duplex option), the I/O buffer size can also be adjusted from the control panel. Three settings exist for the I/O buffer; AUTO (default), ON, and OFF. AUTO sets the printer's I/O buffer to a minimum value that is determined by the total amount of memory that is resident in the printer. Setting I/O buffering to ON allows the user to set the I/O buffer size from the front panel. Setting the I/O buffering to OFF disables I/O buffering . Note When you change the I/O buffer setting all downloaded resources are deleted. Configuration 3-15