5
Memory Usage
Introduction
In some situations, the amount of available memory for printing pages may be smaller than that required for printing. To make more effective use of the available printer memory, newer HP PCL 5 printers incorporate new methods for managing memory. This smaller amount of available memory is made more usable by:
Memory Enhancement technology, MEt, (available on all HP LaserJet 6, LaserJet 5, and LaserJet 4 family printers except the 4, 4M, 4Si and 4SiMx)
Adaptive Data Compression, ADC, (available on HP LaserJet 4, 4M, 4Si, 4SiMx and DeskJet 1200C printers)
Following recommended practices for transmitting data, especially raster graphics, to the printer
For the HP LaserJet 4L, using Raster Graphics Adaptive Compression (PCL compression mode five)
All HP LaserJet 4, 5 and 6 family printers have internal programming for optimizing the use of limited memory. HP LaserJet 4, 4M, 4Si, 4SiMx, and DeskJet 1200C printers compress raster graphics data using a system called Adaptive Data Compression or ADC. The other HP LaserJet 4 / 5 / 6 printers use MEt to compress not only raster graphics data, but also to compress fonts, improve memory usage for page protection, and provide an overall improvement in memory efficiency. Both systems operate automatically and without any intervention from the user.
The HP Color LaserJet printer has memory management features similar to MEt, but has additional features for color processing.
