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'''PC/TCP Packet Driver''' is a networking [[Application programming interface|API]] for [[MS-DOS]], [[PC DOS]], and later [[x86]] [[Disk Operating System|DOS]] implementations such as [[DR-DOS]], [[FreeDOS]], etc. It implements the lowest levels of a [[TCP/IP]] stack, where the remainder is typically implemented either by [[Terminate and Stay Resident|TSR]] drivers or as a library linked into an application program. It was created in 1986 by [[FTP Software]].
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A packet driver uses an [[INT (x86 instruction)|x86 interrupt number]] (INT) between {{nowrap|60h .. 80h.}} The number used is detected at runtime, it is most commonly 60h but may be changed to avoid application programs which use fixed interrupts for internal communications. The interrupt vector is used as a pointer (4-bytes [[Endianness|little endian]]) to the address of a possible interrupt handler. If the text string "''PKT DRVR''" is found within the first 12-bytes immediately following the entry point then a driver has been located.<ref>[http://webcache.googleusercontent.com/search?q=cache:GWzoIfATUFcJ:ftp://ftp.etsii.ull.es/pub/REDES2/doc/packet.txt googleusercontent.com/ull.es - PC/TCP Version 1.09 Packet Driver Specification, FTP Software, Inc.], 1989-09-14</ref>
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