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From: pho@vmsa.oac.uci.edu
Subject: Re: Whick 14.4k?
Nntp-Posting-Host: vmsa.oac.uci.edu
Message-ID: <2C954056.20439@news.service.uci.edu>
Newsgroups: comp.sys.apple2.comm
Organization: University of California, Irvine
Lines: 47
Date: 14 Sep 93 03:53:58 GMT

Matt Ackeret (unknown@apple.com) wrote:

>         Actually, I was wrong about which error happens all of the time..
> Usually it starts with some other error, such as the ZRPOS one, but then
> often many many "got subpacket instead of header" errors occur.. Literally
> hundreds at one time sometimes.. Usually it's not too many and it pauses for
> a second or two, and jumps down to .25K packets..  Then later in the same
> download there are more "got subpacket instead of header" errors.
>
>         I haven't been able to narrow it down at all, and this is during a
> call with error correction on.  Greg says he never gets it, but most people
> on here say it happens all of the time... strange..

ZRPOS and "got subpacket instead of header" errors are usually caused
by improper hardware handshaking.  It could either be your computer
that's overflowing the modem buffer or the other end.  Do you get these
errors when you download and/or upload and what software is the other
end using?  There's not much you can do if the other end is causing the
problem other than advising the operator.  On the other hand, you may
want to double check your cable and software and hardware settings.
Make sure your terminal software supports full hardware handshaking
(HHS).  Select the right modem port and modem drivers.  If using
ProTERM v3.1, select one of the CTS/RTS drivers.  Not only do you have
to tell the software to use HHS but you also have to enable HHS on the
modem.  With a USR Dual Standard you have to make sure &H1 (hardware CTS
flow control) and &R2 (hardware RTS flow control) is in the init string.
ProTERM v3.1 requires that you use the following cable for a IIgs.

   DIN-8             DB-25
   -----             -----
   1 (HSKo)          4 (RTS) connected to 20 (DTR)
   2 (HSKi)          5 (CTS)
   3 (TXD-)          2 (TD)
 - 4 (SG)            7 (SG)
|  5 (RXD-)          3 (RD)
|  6 (TXD+)          NO CONNECTION
|  7 (GPI)           8 (DCD)
 - 8 (RXD+)          NO CONNECTION

* DIN-8 Pins 4 and 8 are connected together.
  DB-25 Pins 4 and 20 are connected together.

With this cable configuration you also have to tell your modem to ignore
DTR (&D0 on USR Dual Standard) otherwise with DTR active your modem will
disconnect anytime the computer drops RTS.  Also, GPI to DCD connection
is very important for proper initialization of the modem port.  If this
connection is missing you will not get CTS handshaking.