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Chapter 16 Rev 10-27-87 Typeset 10-27-87 40
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Chapter 16 ZMODEM Protocol 41
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17. FFFFUUUUTTTTUUUURRRREEEE EEEEXXXXTTTTEEEENNNNSSSSIIIIOOOONNNNSSSS
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Future extensions include:
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o+ Compatibility with 7 bit networks
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o+ Server/Link Level operation: An END-TO-END error corrected
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program to program session is required for financial and other
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sensitive applications.
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o+ Multiple independent threads
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o+ Encryption
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o+ Compression
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o+ File Comparison
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o+ Selective transfer within a file (e.g., modified segments of a
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database file)
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o+ Selective Retransmission for error correction
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18. RRRREEEEVVVVIIIISSSSIIIIOOOONNNNSSSS
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10-27-87 Optional fields added for number of files remaining to be
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sent and total number of bytes remaining to be sent.
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07-31-1987 The receiver should ignore a ZEOF with an offset that
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does not match the current file length. The previous action of
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responding with ZRPOS caused transfers to fail if a CRC error
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occurred immediately before end of file, because two retransmission
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requests were being sent for each error. This has been observed
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under exceptional conditions, such as data transmission at speeds
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greater than the receiving computer's interrupt response capabilitiy
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or gross misapplication of flow control.
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Discussion of the Tx backchannel garbage count and ZCRCW after error
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ZRPOS was added. Many revisions for clarity.
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07-09-87 Corrected XMODEM's development date, incorrectly stated as
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1979 instead of the actual August 1977. More performance data was
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added.
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05-30-87 Added ZMNEW and ZMSKNOLOC
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05-14-87 Window management, ZACK zshhdr XON removed, control
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character escaping, ZMSPARS changed to ZXPARS, editorial changes.
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04-13-87 The ZMODEM file transfer protocol's public domain status
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is emphasized.
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04-04-87: minor editorial changes, added conditionals for overview
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version.
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03-15-87: 32 bit CRC added.
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12-19-86: 0 Length ZCRCW data subpacket sent in response to ZPAD or
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Chapter 18 Rev 10-27-87 Typeset 10-27-87 41
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Chapter 18 ZMODEM Protocol 42
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ZDELE detected on reverse channel has been changed to ZCRCE. The
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reverse channel is now checked for activity before sending each
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ZDATA header.
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11-08-86: Minor changes for clarity.
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10-2-86: ZCNL definition expanded.
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9-11-86: ZMPROT file management option added.
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8-20-86: More performance data included.
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