Pizza box form factor
In computing, a pizza box is a style of case for computers. They tend to be very thin, normally one or two rack units (1U or 2U) in height, making them wide and flat. The result is a case that looks like boxes used to deliver pizza. The first computers generally referred to as pizza box machines were Sun Microsystems desktop workstations sold in the late 1980s, most notably the SPARCstation 1. Other famous examples include the SGI Indy, the NeXTstation, Macintosh LC, and Amiga 1000. The original SPARCstation 1 design included an expansion bus technology, SBus, expressly designed for the form factor; expansion cards were small, especially in comparison to other expansion cards in use at the time such as VMEbus, and were mounted horizontally instead of vertically. PC compatible computers in this type of case typically use the PCI expansion bus and require special low profile expansion cards, shorter than the PCI cards used in regular PCs.
