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Kaypro connected to LAN at 9600 baud [message #130814] Wed, 01 May 1985 16:31 Go to next message
treid is currently offline  treid
Messages: 14
Registered: May 2013
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Article-I.D.: brl-tgr.10335
Posted: Wed May  1 16:31:51 1985
Date-Received: Fri, 3-May-85 20:17:58 EDT
Sender: news@brl-tgr.ARPA
Lines: 9

I have been trying to get my Kaypro to work on our LAN at 9600 baud through
a ROLM data phone (Kaypro goes to back of phone with a normal RS-232 cable).
The Kaypro is a IIx with two serial and one parallel ports.  The symptoms are
problem is
that about 1/3 of the characters are lost on data from the LAN.  The Kaypro
works fine on 1200 baud with a Ventel modem and dialup.

Is this a known problem with the Kaypro's?  Or do all roads lead to ROLM?
Thanks in advance for any help.  Tom.
Re: Kaypro connected to LAN at 9600 baud [message #130820 is a reply to message #130814] Wed, 01 May 1985 22:24 Go to previous messageGo to next message
bridger is currently offline  bridger
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Article-I.D.: brl-tgr.10349
Posted: Wed May  1 22:24:49 1985
Date-Received: Sat, 4-May-85 04:07:31 EDT
Sender: news@brl-tgr.ARPA
Lines: 16


The Kaypro 4-84 boards (new kaypro 2's, kaypro 4's and kaypro 10's) --those
with reverse video, etc. -- use screen memory that is accessible only
through the video controller.  The Kaypro factory roms are rather slow and
fall behind when scrolling (e.g. when the cursor gets to the bottom of the
screen and a linefeed is sent). 1200 baud is about the limit for
continuous-stream text.

Plu*Perfect Systems is writing a new rom for Kaypros that includes a
snappier video driver.  I've  used a test version effectively at 4800 baud,
and with almost no glitches at 9600. That seems to be the limit of what can
be done in firmware, given the hardware memory interfacing.

When ready, it will be available from them and Advent Products.

--bridger mitchell
Re: Kaypro connected to LAN at 9600 baud [message #130830 is a reply to message #130814] Fri, 03 May 1985 16:24 Go to previous messageGo to next message
Anonymous
Karma:
Originally posted by: harmonj%marlin@NOSC.ARPA (James E. Harmon)
Article-I.D.: brl-tgr.10418
Posted: Fri May  3 16:24:32 1985
Date-Received: Mon, 6-May-85 01:30:20 EDT
Sender: news@brl-tgr.ARPA
Lines: 16

-------
Tom,
I didn't get a good return address so I'll reply to the net.

I have had the same problem with both a Kaypro 2 and a Kaypro 4 when they
are connected to a Sytek LAN here at NOSC.  It skips part of a line at
any speed greater than 1200 baud.  I have used Kaypro's TERM program,
MODEM7, KERMIT, and the NOSC TRANSFER terminal programs on the Kaypros
with the same result.
1200 baud works fine for both the Sytek LAN and the Hayes Smartmodem 1200.

Good Luck,

Jim Harmon
(harmonj@NOSC)
-------
Re: Kaypro connected to LAN at 9600 baud [message #134971 is a reply to message #130814] Mon, 06 May 1985 21:50 Go to previous message
Anonymous
Karma:
Originally posted by: ceb@inmet.UUCP
Article-I.D.: inmet.16600005
Posted: Mon May  6 21:50:00 1985
Date-Received: Fri, 10-May-85 01:37:49 EDT
References: <10335@brl-tgr.UUCP>
Lines: 17
Nf-ID: #R:brl-tgr:-1033500:inmet:16600005:000:611
Nf-From: inmet!ceb    May  6 21:50:00 1985


The Kaypro is too slow to run at 9600 baud for terminal emulation.

I had a Kaypro 2 and now have a Kaypro 10. Neither machine can put
characters on the screen much faster than 1800 baud when using
Kermit (or other terminal emulation programs). 

It may be possible to buffer the arriving characters and
compensate for the slowness of the rom-based screen handling routines
if interrupt routines are used to avoid losing characters during
"expensive" operations (scrolling, clear display, etc.).

For file transfers I regularly use 9600/19200 baud when directly
connected to Unixes or other micros.


			/ceb\
Re: Kaypro connected to LAN at 9600 baud [message #134976 is a reply to message #130814] Mon, 06 May 1985 12:43 Go to previous message
hugh is currently offline  hugh
Messages: 27
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Article-I.D.: hcrvx1.1156
Posted: Mon May  6 12:43:31 1985
Date-Received: Fri, 10-May-85 05:41:38 EDT
References: <10417@brl-tgr.ARPA>
Reply-To: hugh@unix.UUCP (Hugh Redelmeier)
Organization: Human Computing Resources, Toronto
Lines: 16
Summary: 

 > I have had the same problem with both a Kaypro 2 and a Kaypro 4 when they
 > are connected to a Sytek LAN here at NOSC.  It skips part of a line at
 > any speed greater than 1200 baud.  I have used Kaypro's TERM program,
 > MODEM7, KERMIT, and the NOSC TRANSFER terminal programs on the Kaypros
 > with the same result.

The Kaypro does scrolling by moving all the characters in the video
RAM up one line (using a Z80 block move instruction).  This takes a
long time.  The solution is to use a program that can accept input
from the host while the scrolling is being done.  This is not
trivial because it requires an interrupt handler that bypasses the
BIOS.  It might be necessary to have XON/XOFF handshaking too.  I wrote
such a program and use it regularly on my Kaypro II (talking at
9600 Baud to my UNIX machine).  Micro Cornucopia also has one on
a public-domain disk (and much other stuff of interest to Kaypro
hacks).
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