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Punter (protocol)
Punter is a protocol for file transfer developed in the 1980s by Steve Punter. There are various types of Punter such as PET Transfer Protocol (PTP), C1 and C2.
== PET Transfer Protocol ==
The PET Transfer Protocol (PTP), also known as Punter or Old Punter, was developed ca. 1980 by Steve Punter for use with his PETBBS and BBS64 bulletin board system (BBS) software. The "PET" in the name comes from the Commodore PET computer.
Compared to other contemporary protocols, PTP is slower than YMODEM and ZMODEM but faster and more reliable than XMODEM.
The earliest version of Punter supports only 7-bit transfers and uses a back-correction algorithm involving two checksums for failsafes. One of the two checksums is additive, and the other is Boolean in nature (executing EOR instructions), making for an easy to understand algorithm for other programmers to understand and emulate. Having two checksums--both of them being 16 bits wide--makes it significantly more accurate than the single-byte checksum used by XMODEM, its major competitor in the early 1980s. Regardless of the potential for errors to creep in, in comparison to the YMODEM protocol of the late 1980s, which is arguably superior, it has been widely used on Commodore PET and Commodore 64 based bulletin boards.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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