The OL400e, OL410e, and the OL410e/PS are compact Light Emitting Diode (LED) page printers. The printers utilize an LED head for the exposure method. Dry electrophotography is used as the development method. The print resolution is 300 x 300 dots per inch. The OL410e and the OL410e/PS (in PCL Mode) can print at 300 x 1200 dots per inch. The printers have a continuous print speed of up to 4 sheets per minute. All three products include both a Centronics parallel interface and a 9-pin RS232 serial interface as standard features. The OL410e/PS includes an LocalTalk interface, which can only be used in PostScript mode. Theprinters have automatic interface switching capabilities, a power-saving standby mode, free-paper sizing (which allows printing on custom size paper), and graphic compression capabilities (for full-page business graphics). The OL400e utilizes 512 Kbyte of standard Random Access Memory (RAM). An optional expansion memory board can be installed. Up to 4 Mbyte of RAM (in 1 Mbyte increments) can be installed on the expansion board, providing up to 4.5 Mbyte of total RAM in the OL400e. The OL410e utilizes 2 Mbyte of standard Random Access Memory (RAM). The main controller board contains 1 Mbyte of RAM. The standard expanded memory board contains 1 Mbyte. An optional expansion memory board can be installed in place of the standard expanded memory board. The optional board contains 2 Mbyte of RAM. However, up to 4 Mbyte of RAM (in 1 Mbyte increments) can be installed, providing up to 5 Mbyte of total RAM in the OL410e. The OL410e/PS utilizes 2 Mbyte of standard Random Access Memory (RAM). 1 Mbyte is on the main control board. 1 Mbyte is on the PostScript Board. The PostScript board will accept and additional 3 Mbytes of RAM, providing up to 5 Mbyte of total RAM in the OL410e/PS. A universal / letter cassette is included with each printer. Legal, executive, and A4 trays are available. The printers will print on a variety of paper types, labels, and transparencies.