Date   : Wed, 15 Aug 1990 18:32:49 GMT
From   : munnari.oz.au!sirius.ucs.adelaide.edu.au!levels!etrmg@uunet.uu.net
Subject: Kaypro 4 and 2400 Baud

In article <90225.204141NETOPRDW@ncsuvm.ncsu.edu>, NETOPRDW@ncsuvm.ncsu.edu
writes:
> 
>   I have a Kaypro 4, 1983 model and a 2400 Baud modem.  My problem is, at
> 2400 baud, it tends to drop characters.
> Thus:
> 
> Enter username>
> 
> becomes
> 
> Etsernme>

I am well aware of how this makes you feel. . .
 
> Is this a problem of software or hardware?

It's a hardware problem. 

> How do I solve this problem?

Get in touch with the people at Microcornucopia Magazine in Bend, OR.
They offered a complete range of new monitor ROMs that use advanced video
command sequences.  This would allow the Z80 to do less video housekeeping
(ie. more character buffering) and you'll get to keep your current setup.

> I have this difficulty with MODEM7+, YAMKAP, and CP4KPR.

I have it with ZMP, Kermit, and MDM730 (basically everything serial!)

> It is silly to have to use 1200 baud when I can go much faster.

Tell me about it!  I hear the '84 series (mine) with graphics is even slower
hence my knowledge about this.  I can't even go 1200 with my Hayes without
nulls on the BBS I'm calling!  Unfortunately, nowadays, nobody needs nulls
(but me!!!)  My MOD involved a new ROM (PRO-MAX884 = $79.00 US) and a 2MHz
68B45 chip from Motorola.  No worries at all.  Works beautifully!  Even gives
me current time & date on the 25th line (status line) CONSTANTLY!  VT52
Terminal emulation (H89, etc.) and Screen dump, & much more. (ZCPR in ROM) 

If you want an address or a few more references to articles in uC, let me know
by email.
 Good luck  . . . . Ronn