Article 141239 of comp.os.vms:
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From: vance@alumnae.caltech.edu (Vance R. Haemmerle)
Newsgroups: comp.os.vms
Subject: Re: High serial communications speeds
Date: 27 Feb 1996 04:03:53 GMT
Organization: Caltech Alumni Association
Lines: 55
Message-ID: <4gtvr9$sqj@gap.cco.caltech.edu>
References: <4go3fa$phl@apakabar.cc.columbia.edu>
NNTP-Posting-Host: alumnae.caltech.edu

In article <4go3fa$phl@apakabar.cc.columbia.edu>,
Frank da Cruz <fdc@watsun.cc.columbia.edu> wrote:
>Working on a new release of C-Kermit for VMS.  My development system is
>still VMS 5.5-2, which (according to HELP SET TERM /SPEED) only supports
>serial speeds up to 19200.  Would like to support higher speeds.  Question:
>
>What speeds are supported in new VMS releases in excess of 19200?
>
>And more to the point, what are the C header-file symbols for them:
>
>  Presumed Symbol       Value (if any)
>  TT$C_BAUD_20000       ???
>  TT$C_BAUD_28800       ???
>  TT$C_BAUD_38400       0x11
>  TT$C_BAUD_57600       ???
>  TT$C_BAUD_76800       ???
>  TT$C_BAUD_115200      ???
>  TT$C_BAUD_230400      ???
>  ...
>
>I need to know the values because if these symbols are not defined in the
>header files on the development system, I have to fill them in; e.g.:
>
>#ifndef TT$C_BAUD_38400
>#define TT$C_BAUD_38400	0x11
>#endif /* TT$C_BAUD_38400 */
>
>(That's the only example I have at present.)
>
>Presumably at runtime if we try to set a speed that is unknown to VMS or
>is invalid for the particular device, VMS will return an error indication,
>gracefully.


   I changed C-Kermit locally here to support higher speeds only to learn
that a bug in the driver limits the TTA0: port to 19,200 on VMS V6.1-1H2.

This is from my modified CKVTIO.C

#ifndef TT$C_BAUD_57600
#define TT$C_BAUD_57600 0x12
#endif /* TT$C_BAUD_57600 */
#ifndef TT$C_BAUD_76800
#define TT$C_BAUD_76800 0x13
#endif /* TT$C_BAUD_76800 */
#ifndef TT$C_BAUD_115200
#define TT$C_BAUD_115200        0x14
#endif /* TT$C_BAUD_115200 */

  The values can be obtained from the $TTDEF module in SYS$LIBRARY:STARLET.REQ.

--
Vance Haemmerle
vance@alumni.caltech.edu