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- Newsgroups: comp.os.os2.apps
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!uchinews!ellis!sip1
- From: sip1@ellis.uchicago.edu (Timothy F. Sipples)
- Subject: Re: Can a DOS comm. TSR be set above 9600bd ?
- Message-ID: <1993Jan12.024556.29546@midway.uchicago.edu>
- Sender: news@uchinews.uchicago.edu (News System)
- Reply-To: sip1@midway.uchicago.edu
- Organization: Dept. of Econ., Univ. of Chicago
- References: <1993Jan11.171247.229@cmu.unige.ch> <1993Jan11.204008.28876@njitgw.njit.edu>
- Date: Tue, 12 Jan 1993 02:45:56 GMT
- Lines: 32
-
- In article <1993Jan11.204008.28876@njitgw.njit.edu> dic5340@hertz.njit.edu (David Charlap) writes:
- >>I am experiencing problems running a DOS communication TSR in
- >>a VDM dos 5.0. Indeed, I cannot use a baud rate faster than 9600.
- >>Can anybody give some advice in order to rise it up to 57Kbd or
- >>eventually even 115200 ?
- >Not without changing a piece of OS/2. OS/2 will not (or can not)
- >provide a DOS box more than 1000 interrupts per second. 9600 baud
- >requires (at no parity, 8 data bits, one stop bit, one start bit) 960
- >interrupts per second to receive a continuous stream. Faster speeds
- >will go beyond the limit and fail.
- >Note, you can set the port to faster, and you can certainly send data
- >at those speeds, but receiving at high speeds will require interrupts
- >to go faster than OS/2 allows. Either use real DOS or an OS/2 comm
- >program.
-
- It should also be pointed out that some people have reported increased
- DOS session communications performance with the SIO communications
- drivers, available via anonymous ftp from ftp-os2.nmsu.edu (in
- /pub/uploads at the moment; look for a file that begins with "sio").
-
- Also, this limit is not a hard and fast one. It is system dependent.
- It also may be impacted by whether or not you have a buffered UART.
-
- I do agree with the main conclusion, that switching over to an OS/2
- communications program is your best bet. They were designed from the
- start to multitask.
-
- --
- Timothy F. Sipples | Read the OS/2 FAQ List 2.0i, available from
- sip1@ellis.uchicago.edu | 128.123.35.151, anonymous ftp, in /pub/os2/all/info
- Dept. of Econ., Univ. | /faq, or from LISTSERV@BLEKUL11.BITNET (send "HELP")
- of Chicago, 60637 | [Read the List, THEN post to ONE OS/2 newsgroup.]
-