HP 4550 Service Manual - Page 18

Table 1-1 Printer features (continued) Feature Description CPU
The Color LaserJet 4500 series formatter PCB incorportates a 133 MHz RISC processor
The Color LaserJet 4550 series formatter PCB incorporates a 233 MHz RISC processor Memory-standard Memory-optional HP Color LaserJet 4500 series:
32 MB RAM (Base)
64 MB RAM (HP Color LaserJet 4500 N/4500 DN)
Memory Enhancement Technology (MEt), which automatically compresses data to use RAM more efficiently HP Color LaserJet 4550 series:
64 MB RAM (Base)
128 MB RAM (HP Color LaserJet 4550DN and HDN)
Memory Enhancement Technology (MEt), which automatically compresses data to use RAM more efficiently
HP Color LaserJet 4500 series: Install 4, 8, 16, 32, or 64 MB DIMMs into the three DIMM slots to a possible total 208 MB. Synchronous SDRAM modules do not need to be configured in pairs (in corresponding left and right slots). If you install more than 208 MB of RAM, it will not be used by the printer.
HP Color LaserJet 4550 series: Install 64 or 128 MB DIMMS into the two DIMM slots to a possible total of 192 MB. If you install more than 192 MB of RAM, it will not be used by the printer.
HP Color LaserJet 4550 series: 5 GB hard disk drive (Included wit the HP Color LaserJet 4550HDN printer). CAUTION: The HP Color LaserJet 4500 series uses 100-pin, non-parity, SDRAM DIMMs. The HP Color LaserJet 4550 series uses 168-pin, non-parity, synchronous DRAM DIMMs. Extended Data Output (EDO) DIMMs are not supported. 16 Printer description C7085-90921