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