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YMODEM refers to the XMODEM/CRC protocol with batch transmission and
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optional 1024 byte blocks as described in YMODEM.DOC.[1]
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6. ZZZZMMMMOOOODDDDEEEEMMMM RRRREEEEQQQQUUUUIIIIRRRREEEEMMMMEEEENNNNTTTTSSSS
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ZMODEM requires an 8 bit transfer medium.[1] ZMODEM escapes network
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control characters to allow operation with packet switched networks. In
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general, ZMODEM operates over any path that supports XMODEM, and over many
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that don't.
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To support full streaming,[2] the transmission path should either assert
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flow control or pass full speed transmission without loss of data.
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Otherwise the ZMODEM sender must manage the window size.
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6.1 FFFFiiiilllleeee CCCCoooonnnntttteeeennnnttttssss
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6.1.1 BBBBiiiinnnnaaaarrrryyyy FFFFiiiilllleeeessss
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ZMODEM places no constraints on the information content of binary files,
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except that the number of bits in the file must be a multiple of 8.
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__________
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1. Available on TeleGodzilla as part of YZMODEM.ZOO
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1. The ZMODEM design allows encoded packets for less transparent media.
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2. With XOFF and XON, or out of band flow control such as X.25 or CTS
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Chapter 6 Rev 10-27-87 Typeset 10-27-87 10
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Chapter 6 ZMODEM Protocol 11
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6.1.2 TTTTeeeexxxxtttt FFFFiiiilllleeeessss
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Since ZMODEM is used to transfer files between different types of computer
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systems, text files must meet minimum requirements if they are to be
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readable on a wide variety of systems and environments.
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Text lines consist of printing ASCII characters, spaces, tabs, and
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backspaces.
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6.1.2.1 AAAASSSSCCCCIIIIIIII EEEEnnnndddd ooooffff LLLLiiiinnnneeee
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The ASCII code definition allows text lines terminated by a CR/LF (015,
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012) sequence, or by a NL (012) character. Lines logically terminated by
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a lone CR (013) are not ASCII text.
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A CR (013) without a linefeed implies overprinting, and is not acceptable
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as a logical line separator. Overprinted lines should print all important
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characters in the last pass to allow CRT displays to display meaningful
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text. Overstruck characters may be generated by backspacing or by
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overprinting the line with CR (015) not followed by LF.
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Overstruck characters generated with backspaces should be sent with the
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most important character last to accommodate CRT displays that cannot
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overstrike. The sending program may use the ZZZZCCCCNNNNLLLL bit to force the
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receiving program to convert the received end of line to its local end of
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line convention.[3]
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__________
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3. Files that have been translated in such a way as to modify their
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length cannot be updated with the ZZZZCCCCRRRREEEECCCCOOOOVVVV Conversion Option.
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