355 lines
6.7 KiB
Plaintext
355 lines
6.7 KiB
Plaintext
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19200HST
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By Joseph Sheppard
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Sysop, The Ledge PCBoard (818) 352-3620
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WHAT IT DOES:
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-------------
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19200HST is a utility program written with Turbo Pascal 5.0 using
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routines from Prokit by Samuel Smith.
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19200HST is released as a free program. No donations are requested for
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it's use. The authors are not responsible for any damage that might be
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caused by the use of this program. Please use this program at your own
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risk.
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The purpose of 19200HST is to aid owners of USRobotics Courier HST
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modems in setting up for optimum speed.
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This program is designed for callers only. Although I run my BBS with
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the settings from 19200HST, I would recommend that Sysops follow the
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instructions for their specific BBS package on modem settings.
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Registered PCBoard sysops have a similar program called PCBMODEM that
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should be used instead of this program.
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This program will lock your serial port at 19200. This setting may
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only be effective on 286 and 386 systems. Some multi-tasking software
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may not be able to handle this setting. If you find that you are
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having trouble with aborted downloads after running this program then
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you should probably go into your terminal program and type AT&F
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followed by the ENTER key to reset the modem to it's factory settings.
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Using these settings along with protocols designed for error correcting
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modems such as DSZ's Ymodem-G and Xmodem-1K-G or Qmodem's version of
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Ymodem-G I have achieved file transfer speeds in the 1100 - 1150 cps
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range on a regular basis using both 286 and 386 systems.
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HOW IT DOES IT:
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---------------
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19200HST starts by giving the suggested dipswitch settings, which are
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as follows:
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1 2 3 4 5 6 7 8 9 10
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-- -- -- -- -- -- -- -- -- --
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UP UP DN DN DN UP UP DN UP UP
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These settings will do the following to your modem:
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1 UP - DTR is controlled by software
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2 UP - Send verbal result codes
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3 DN - Result codes are displayed
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4 DN - Local echo of commands is suppressed
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5 DN - Auto Answer Suppressed
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6 UP - Do not force carrier detect
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7 UP - Single phone line connection (RJ-11)
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8 DN - AT command set enabled
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9 UP - Hang up when escape code is sent
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10 UP- Load from NRAM in power up
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It then will reset your modems internal NRAM settings to the original
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factory defaults.
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Next it sends the following settings to the modem's non-volitile
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memory:
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ATS7=60E0M0X7
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S7=60 - Number of seconds modem waits for carrier
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E0 - Local echo off
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M0 - Speaker Off (can be overidden by putting M1 in your modem program's
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initialization string)
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X7 - Result code option (OK, CONNECT, RING, NO CARRIER, ERROR, CONNECT,
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NO DIAL TONE, BUSY, NO ANSWER, RINGING, VOICE)
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Once this string is received it sends the following additional
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settings:
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AT&H3&R2&S1&B1&K0&W
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&H3 - Hardware and software control
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&R2 - Received data output to terminal on RTS high
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&S1 - Modem controls DSR
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&B1 - Lock port at speed setting (19200)
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&K0 - Disable data compression (override with &K1 in modem
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initialization string)
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&W - Write these settings to non-volitile RAM (NRAM).
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After running this program, you should go into the setup portion of
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your modem program (Qmodem, Procomm or whatever) and change the modem
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initialization string to ATZ followed by whatever character that
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program uses to send a carriage return (Qmodem uses a { Procomm uses a
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!).
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DATA COMPRESSION?
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-----------------
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The HST has a setting for "Data Compression". 19200HST turns this off
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because I've found that when the HST tries to compress a file that is
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already compressed, such as an .ARC file that it will slow the transfer
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down considerably. Text Files and compiler listings that are not
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compressed will go at blinding speeds, but in the real BBS world it's
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rare to find files in the download sections that aren't in some sort of
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compressed form.
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If your application finds you downloading mostly un-compressed files
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then you may want to put &K1 in your modem initilization string.
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Otherwise, leave it alone and you will see a marked increase in
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performance.
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TIPS 'N' TRICKS:
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----------------
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If you want to overide any of the NRAM settings that I have written in
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the program, you can either do by placing the replacement commands in
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the modem initialization string, or by going into the terminal mode of
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your modem software and typing those commands followed by AT&W.
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It is highly recommended that you use a high performance protocol
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driver such as DSZ by Chuck Foresberg. The registered version of DSZ
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includes YMODEM-G and Xmodem-1K-G protocols which should yield the
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highest possible CPS ratings under this setup. The current versions of
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many popular modem programs have built-in versions of Xmodem-1K-G
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(called Ymodem-G in some versions) which will yield excellent speed,
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but won't allow batch mode downloading that true Ymodem-G from the DSZ
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program features.
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Zmodem will give 1000-1100 cps on properly configured systems. Zmodem
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is featured in non-registered versions of DSZ that are available on
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most BBS systems.
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Avoid using Xmodem, Ymodem, WXmodem, Kermit, Jmodem or other protocols
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that rely on software error checking when you are connected to another
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HST at the fixed 19200 bps rate. These protocols will give you between
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400-900 cps. One reason I wrote this program was that I see people
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night after night calling with HST modems improperly configured and
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getting transfer speeds of 400 cps.
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SUPPORT:
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--------
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As stated above, this is a free program. You will probably use it
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once, then throw it away and forget all about me. That's fine, but at
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least when you call my BBS at 19200 you won't be getting 400 cps!
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Updates to 19200HST are always available on my BBS, The Ledge PCBoard,
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which is listed at the top of this file. Although you can't download
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from my file directory on the first call, you will be able to open the
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SUPPORT door and download any of the programs that I've written, or any
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third party programs (such as DSZxxxx.ARC) that are mentioned in this
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file. My support door DOES have Xmodem-1K-G (Ymodem-G) so if you are
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looking for a place to test...come on!
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