Dual cartridges are less expensive in the long run because they print more efficiently by wasting less ink, and they're faster. This makes it easier for the printer to inform your PC of its status. Ask a salesperson to help you match your computer and printer. Or Buffer Memory holds the graphic information on its way to be printed. The larger the RAM, the faster the printer can print complex graphics.
Front feed uses rubber rollers to bring the top sheet from the tray into the printer.
The tray for new sheets is placed in front of the printer, requiring more desk space. Whereas Top feed printers feed the paper down into the printer and hence they don't require as much space. This refers to the maximum number of pages that can be stored in the printer before refilling it. A larger capacity tray allows you to leave the printer unattended for longer period of time. Postscript is a more complex language and is used in printers that handle complex graphics.