XMODEM and YMODEM

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2 total messages Started by Steve Hansen Mon, 04 Jan 1993 22:02

#604

Author: Steve Hansen
Date: Mon, 04 Jan 1993 22:02

10 lines
779 bytes

Is this true?

YMODEM = XMODEM + 1k packet size + CRC checking + multiple file
         transmit ability.

That is, if I have a choice between XMODEM-1k and YMODEM, do I use
YMODEM only if I need the multiple file transmit ability?

Can anyone recommend a text which explains the history and differences
and advantages of various telecom protocols (X/Y/ZMODEM & Kermit)?

Re: XMODEM and YMODEM

#607

Author: Joe Kellett
Date: Thu, 07 Jan 1993 02:48

16 lines
1117 bytes

shansen@adobe.com (Steve Hansen) writes:
: 
: ...Can anyone recommend a text which explains the history and differences
: and advantages of various telecom protocols (X/Y/ZMODEM & Kermit)?
: 
No, just some oral tradition on X, Y, and Zmodem  (I know nothing of
Kermit)...

The BBS sysops around here all recommend Zmodem.  It reduces its block
size in the presence of line errors to reduce retransmissions.  It
increases the block size again if things clean up.  The best thing about
if you're paying for a call is "crash recovery".  If you restart a Zmodem
transmission after a line drop, Zmodem detects that there is a partial
file on the receiving end and just retransmits the missing data.

Joe Kellett

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