C1
C1, C01, C.I or C-1 may refer to:
Diverse
Biology
Sharp Nintendo Television
The Sharp Nintendo Television (often described as the C1 NES TV; originally released for Japanese markets as My Computer TV C1 (マイコンピュータテレビC1 Mai Konpyuta Terebi C1)) is a television produced by Sharp Corporation with a built-in licensed Famicom. Originally released in Japan in 1983, the unit was released in the US in 1989. The C1 is notable for having provided the high-quality screenshots displayed in video game magazines of the period, due to its having slightly better picture quality than a Famicom or NES paired with a separate television. The concept was followed up in Japan by the Super Famicom-based SF1 in 1990.
Overview
The C1 is a television set developed jointly by Sharp Corporation and Nintendo that features a built-in Famicom system. The system was licensed by Nintendo and was released in 1983 to Japanese markets, and supported until 1989. It was noted for having a clearer picture quality than the original setup requiring a Famicom and composite video through an RF Modulator connection. This system used the 2C03 PPU which supports native RGB output for the highest quality picture at a cost of some compatibility and color limitations with games. For this reason, screenshots featured in video game magazines of the time were often taken from the C1.
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.
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