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P

PBM - Portable BitMap: A bitmap image format with 1 bit per color (black & white). This is one of the formats of the PBMplus graphics converter tools package. The other formats are PGM and PPM. See also: BMP, GIF, HDF, IFF, JPEG, PCD, PNG, PNM, TIFF, XBM.
PC - Personal Computer: A computer for personal use of one or a limited number of users.
PCD - Photographs on CD: The format of photographs on a PhotoCD. It is a bitmap format with up to 24 bits per color (16777216 colors). See also: BMP, GIF, HDF, IFF, JPEG, PBM, PGM, PNG, PNM, PPM, TIFF, XBM.
PCI - Programming Communications Interface: A European standard for plug-in-cards and communications software for PCs.
PCMCIA - Personal Computer Memory Card Interface Adaptor: This interface standard was developed for PCs, especially laptops. The plug to put in this interface has about the size of a credit card and was mostly intended for memory extensions, but nowadays there are "cards" for other purposes like SCSI hosts, network adaptors or modems.
PGA - Pin Grid Array: A type of IC cover design.
PGM - Portable GrayMap: A bitmap image format with up to 8 bits per color (256 grayscales). This is one of the formats of the PBMplus graphics converter tools package. The other formats are PBM and PPM. See also: BMP, GIF, HDF, IFF, JPEG, PCD, PNG, PNM, TIFF, XBM.
PhotoCD - Photograph Compact Disc: This CD-ROM format for photographs in PCD format was developed by Philips & Kodak (1992).
PNG - Portable Network Graphics: A bitmap image format with alpha channel, loss-free compression and up to 24 bits per color (16777216 colors). This "free" format was designed to replace GIF. See also: BMP, HDF, IFF, JPEG, PBM, PCD, PGM, PNM, PPM, TIFF, XBM.
PNM - Portable aNyMap: A part of the PBMplus graphics converter package can use any of the formats PBM, PGM and PPM. Those tools have PNM in the filename.
POP - Post Office Protocol: A protocol for E-Mail transfers from an ISP.
PPM - Portable PixMap: A bitmap image format with up to 24 bits per color (16777216 colors). This is one of the formats of the PBMplus graphics converter tools package. The other formats are PBM and PGM. See also: BMP, GIF, HDF, IFF, JPEG, PCD, PNG, PNM, TIFF, XBM
PPP - Point to Point Protocol: A common transfer protocol for serial connections to the Internet, based on TCP/IP. This replaces the former SLIP.
PPPoE - Point to Point Protocol over Ethernet: A variant of PPP via an Ethernet connection.
PSU - Power Supply Unit

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