Date   : Mon, 12 Aug 1985 20:01:22 GMT
From   : Chuck Forsberg WA7KGX <caf%omen.uucp@BRL.ARPA>
Subject: Re: Protocol Wars

The main weakness in the Hoff protocol is the dependence on timing of the
C-K sequence.  If timesharing systems, error correcting modems, and/or packet
switch networks are involved, two characrers sent back to back can arrive at
the other end separated by several seconds, and vice versa.

With the advent of PC-PURSUIT which allows virtually unlimited night calling
within 12 cities local call areas for a $25/month flat fee, these
considerations may be upon us sooner than we think.

The YMODEM protocol, wherein the block size is specified to the sender
(SK for 1k, S for 128) has been in use for several years on a multitude of
micro, mini, and mainframe computers and does not have this weakness.

Working between two sngle process micros, with standard modems and phone lines,
the Hoff protocol works well enough for CP/M use.
-- 
  Chuck Forsberg WA7KGX   ...!tektronix!reed!omen!caf   CIS:70715,131
Omen Technology Inc     17505-V NW Sauvie Island Road Portland OR 97231
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