alex@csin.UUCP (Alexis Layton) (03/09/84)
Hello. Here at CCA we are in the process of bringing up 4.2. We have several Ann Arbor Ambassadors hard-wired to our VAX 11/780 using Able DH/DMs. We like to run these at 19.2k because of the large screen size. Unfortunately, it seems that 4.2 is not handling this well; sometimes large chunks of text are missing. Has anyone out there had similar problems? Please respond to decvax!cca!rona (rona@cca-unix) or me. Alexis Layton Computer Corporation of America alex@cca-unix decvax!cca!alex
kav@ih1ap.UUCP (Kurt Vangsness) (03/14/84)
I have seen several references to using 19.2B on a VAX 11/780. Is this with a DZ11? I asked our local DEC field service engineers about any way to use the DZ11 with an external clock (or something) to go beyond 9600, but they didn't have any ideas. If anyone has experiance with 19.2 on a VAX, I would appreciate any information that could be passed on. Thanks, Kurt Vangsness AT&T - Bell Laboratories, Naperville, Ill ihnp4!ih1ap!kav
kg@hplabs.UUCP (Ken Greer) (03/14/84)
Cygnet is using 19.2kb with AAA's and it works OK. -- Ken Greer
gwyn@brl-vgr.ARPA (Doug Gwyn ) (03/15/84)
Your DEC Field Service "engineers", like so many these days, are plain incompetent. The DZ11 can run at 19.2KB as one of its standard speeds. Most UNIX DZ11 drivers implement this as the "EXTA" DH11 equivalent. I once used 19.2KB on a PDP-11/34 and saw no noticeable speed improvement since the kernel could not keep up with the device capacity at that speed. (The DZ11 interrupts on every character in or out. That is why the KMC11B controller is so important if you have DZ11s.)
kg@hplabs.UUCP (Ken Greer) (03/15/84)
I have seen several references to using 19.2B on a VAX 11/780. Is this with a DZ11? I asked our local DEC field service engineers about any way to use the DZ11 with an external clock (or something) to go beyond 9600, but they didn't have any ideas. If anyone has experiance with 19.2 on a VAX, I would appreciate any information that could be passed on. We use an Able DH which supports 19.2Kb. -- Ken Greer
hoffman@pitt.UUCP (Bob Hoffman) (03/16/84)
19.2Kbps works just fine on our 4.2bsd 11/780 with a DEC DZ-11A mux. Just say 'stty exta'. External A is really 19.2Kbps. I've had no problems with it (yet). Plessey DZ-11 equivalents do the same thing, too. ---Bob Hoffman, Pitt CS
fair@dual.UUCP (Erik E. Fair) (03/17/84)
The DEC DZ-11 that we had on the Cory Hall PDP-11/70 could go 19.2Kbaud
without external clocking. You'll probably have to look up what value
you have to poke the DZ with from the driver to get it to do that,
though.
Erik E. Fair
dual!fair@Berkeley.ARPA
{ihnp4,ucbvax,cbosgd,decwrl,amd70,fortune,zehntel}!dual!fair
Dual Systems Corporation, Berkeley, Californiascw@UCLA-LOCUS.ARPA (03/17/84)
From: Steve Woods <cepu!scw@UCLA-LOCUS.ARPA> I have seen several references to using 19.2B on a VAX 11/780. Is this with a DZ11? I asked our local DEC field service engineers about any way to use the DZ11 with an external clock (or something) to go beyond 9600, but they didn't have any ideas. If anyone has experiance with 19.2 on a VAX, I would appreciate any information that could be passed on. Thanks, Kurt Vangsness AT&T - Bell Laboratories, Naperville, Ill ihnp4!ih1ap!kav The DZ-11 is quite capabile of running at 19.2K baud. The DZ-11 control registers have a 4 bit wide filed that is used to define the speed of the selected line. The speed with all 4 bits set (refered to in the manual as reserved for diagnostic use) is 19200 baud. If you have a terminal that can handle 19.2K baud hook it up to a line and run the DEC DZ diags. To use the Line at 19.2 K you have 2 choices in setting up the ioctl,(1) you can use exta or extb as the 19.2 specifier or (2) you can add an additional define to <tty.h> (is that the right one? I'm writting thst from home w/o any manuals) and hack up stty to know about it. In either case, don't forget to modify getty to use the appropriate speed. <scw>
dmmartindale@watcgl.UUCP (Dave Martindale) (03/20/84)
Actually, the DEC DZ11 does run at 19.2Kb. It just isn't documented.
Just change the dz_speeds table to:
char dz_speeds[] =
{ 0,020,021,022,023,024,0,025,026,027,030,032,034,036,037,0 };
and you have 19200 baud!