Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site omen.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!mtuxo!mtunh!mtung!mtunf!ariel!vax135!cornell!uw-beaver!tektronix!reed!omen!caf From: caf@omen.UUCP (Chuck Forsberg WA7KGX) Newsgroups: net.micro.cpm Subject: Re: Protocol Wars Message-ID: <215@omen.UUCP> Date: Mon, 12-Aug-85 18:01:22 EDT Article-I.D.: omen.215 Posted: Mon Aug 12 18:01:22 1985 Date-Received: Sat, 17-Aug-85 13:42:54 EDT References: <513@brl-tgr.ARPA> Reply-To: caf@omen.UUCP (Chuck Forsberg WA7KGX) Organization: Omen Technology, Portland Lines: 20 Summary: 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 Voice: 503-621-3406 Modem: 503-621-3746 (Hit CR's for speed detect) Home of Professional-YAM, the most powerful COMM program for the IBM PC