Date   : Tue, 15 Dec 1992 12:34:09 -0500
From   : Jay Sage <sage@ll.mit.edu>
Subject: Re: Kaypro II Video Problem

Several attempts to reply directly to "reynaert@arizona.edu" have failed with
a "user unknown" message from the host, so I will post my response here.

>> I have benn having problems with my communications when I use an external
>> modem at 2400 BPS, Some characters are lost while the comunication is
>> going on. This only happens when there is output to my adm3a screen.
>> Curiously, this doesn't happen at 1200 BPS or less. Also I have down
>> loaded files at 2400 BPS and no data has been lost...

   This is a very well known problem with Kaypro computers.  It is the
result of a poor design of the video display.  When a new line must be
created at the bottom of the screen and the existing lines have to be
scrolled up, the system takes so long that incoming characters are lost.  I
don't use a Kaypro myself, but many friends do.  There is a file that
implements a correction to this (I can't remember exactly what it does or
how it does it).  A common work around is to clear the screen every time it
fills up and to start again from the top.  If you don't get more specific
advice from others who reply to you, get back to me and I will try to dig up
that file for you.  It is posted on my BBS system, which is sponsored by the
former Kaypro User Group of the Boston Computer Society (now broadened to
include all CP/M and MS-DOS computers).  In case you are a BBSer, its phone
number is 617-965-7046.  This reaches first a v.32bis modem and, if that one
is busy, a USR Courier HST on line 2 (alternatively reachable directly at
617-965-7785).

-- Jay Sage