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- From: sip1@ellis.uchicago.edu (Timothy F. Sipples)
- Subject: Re: kermit or ckermit at 9600 baud
- Message-ID: <1992Sep12.013736.16791@midway.uchicago.edu>
- Sender: news@uchinews.uchicago.edu (News System)
- Reply-To: sip1@midway.uchicago.edu
- Organization: Dept. of Econ., Univ. of Chicago
- References: <1992Sep8.212032.6237@physics.ucla.edu>
- Date: Sat, 12 Sep 1992 01:37:36 GMT
- Lines: 51
-
- In article <1992Sep8.212032.6237@physics.ucla.edu> hsr@physics.ucla.edu (Harisankar Ramishan) writes:
- >Recently, I have been helping setup OS/2 on my brother's machine, and the
- >only real problem has been ckermit.
- >His system is a 25 MHz 486 machine, with an EXTERNAL Hayes modem (a v42/v32
- >modem as I recall, capable of some 30+ kilobaud transfer rate). He uses it
- >to connect to a 9600 baud connection on his mainframe.
- >Under DOS, no problem. Under OS/2, at 9600 baud, get dropped bits, graphics
- >is messed up and downloads invariably fail due to too many errors.
- >At 2400 baud, things seem to work <but did not test sufficiently>.
- >Question: If a 'smart' <ie buffered> modem is connected to the computer via
- >a 'dumb' <ie unbuffered> com port, what would be the net performance under
- >a multitasking OS like OS/2? I felt that as long as the modem sends the
- >information 16 bits at a time, it shouldn't matter if the com port is
- >buffered or not. Is that true?
-
- Well, something like that. :-)
-
- If you are (a) using OS/2 communications software; (b) enable hardware
- handshaking (in both the modem and the OS/2 side, per the instructions
- in the FAQ List) then you should be all set. I work this way using
- HyperAccess/5 with the port locked at 38,400 bps. The hardware
- handshaking is the key, though. Sometimes the modem can't keep up
- with the sending computer, and vice versa.
-
- >Second question: ckermit for OS/2 was _worse_ than kermit for DOS with this
- >system. Seemed very slow, especially with TeK 4010 graphics.
-
- Which version of Kermit are you using? There are several available
- via anonymous ftp from ftp-os2.nmsu.edu (well, at least four) -- give
- them all a try.
-
- Also, don't discount PM Terminal, which comes with your OS/2 system.
- It has Kermit, XMODEM, and YMODEM, along with keyboard remapping and
- superior DEC terminal emulation.
-
- >Incidentally, the simple tests we did to check the performance of fortran
- >on that machine were very impressive. His astrophysics codes ran almost
- >as fast as 16bit OS/2 executables as they did when compiled for DOS <ie,
- >not a comparison of DOS VDM vs vanilla DOS, but a comparison of segmented
- >OS/2 vs DOS; my own tests usually showed a big difference. I guess I use
- >huge arrays more plentifully>
-
- How about recompiling that code for 32 bits using a combination of f2c
- and gcc/2 (or emx/gcc), all available from ftp-os2.nmsu.edu? You'll
- get even better results then, I'm sure.
-
- --
- Timothy F. Sipples | The OS/2 FREQ. ASKED QUESTIONS LIST is avail. from
- sip1@ellis.uchicago.edu | 128.123.35.151, anonymous ftp, in /pub/os2/all/faq.
- Dept. of Econ., Univ. | Or from LISTSERV@BLEKUL11.BITNET (send "HELP").
- of Chicago, 60637 | Family Values Means a Job
-