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The ZMODEM Inter Application File Transfer Protocol
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Chuck Forsberg
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Omen Technology Inc
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_A_B_S_T_R_A_C_T
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The ZMODEM file transfer protocol provides reliable file and command
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transfers with complete EEEENNNNDDDD----TTTTOOOO----EEEENNNNDDDD data integrity between application
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programs. ZMODEM's 32 bit CRC catches errors that continue to sneak into
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even the most advanced networks.
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ZMODEM rapidly transfers files, particularly with buffered (error
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correcting) modems, timesharing systems, satellite relays, and wide area
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packet switched networks.
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ZMODEM greatly simplifies file transfers compared to XMODEM. In addition
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to a friendly user interface, ZMODEM provides Personal Computer and other
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users an efficient, accurate, and robust file transfer method.
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ZMODEM provides advanced file management features including AutoDownload
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(Automatic file Download initiated without user intervention), Crash
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Recovery, selective file transfers, and security verified command
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downloading.
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ZMODEM protocol features allow implementation on a wide variety of systems
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operating in a wide variety of environments. A choice of buffering and
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windowing modes allows ZMODEM to operate on systems that cannot support
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other streaming protocols. Finely tuned control character escaping allows
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operation with real world networks without Kermit's high overhead.
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Although ZMODEM software is more complex than unreliable XMODEM routines,
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actual C source code to pppprrrroooodddduuuuccccttttiiiioooonnnn programs allows developers to upgrade
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their applications with efficient, reliable ZMODEM file transfers with a
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minimum of effort.
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ZMODEM is carefully designed to provide these benefits using a minimum of
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new software technology. ZMODEM can be implemented on all but the most
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brain damaged computers.
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ZMODEM was developed _f_o_r _t_h_e _p_u_b_l_i_c _d_o_m_a_i_n under a Telenet contract. The
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ZMODEM protocol descriptions and the Unix rz/sz program source code are
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public domain. No licensing, trademark, or copyright restrictions apply
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to the use of the protocol, the Unix rz/sz source code and the _Z_M_O_D_E_M
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name.
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