Message-ID: <13168@sri-arpa.UUCP>
Date: Wed, 5-Sep-84 11:32:00 EDT
Article-I.D.: sri-arpa.13168
Posted: Wed Sep  5 11:32:00 1984
Date-Received: Wed, 12-Sep-84 02:18:16 EDT
Lines: 41

From:  Walt 

Just joined the list, so don't know if this is old news...

                ---------------

Date:  1 Sep 1984 1608-CDT
From: SAENZ at TI-CSL
Subject: modem problems, Bunky?
To: buehring at TI-CSL

Found this in the 9/84 BYTE, p 34.

TIMING ERROR IN IIc MODEM ACKNOWLEDGED

The Apple IIc computer has a problem with many modems, an Apple
spokesperson has confirmed.  Although insisting that both the 300
and 1200 bps Apple modems run on the IIc without problems, she 
admitted that a timing error in the computer causes trouble for
some other modems.

The problem is the 6551 ACIA chip, which provides the clock for the
serial (modem) port, she said.  This chip runs 2.9% slow; the specified
limits for modem-port clock speed are +- 2.0%.  A highly knowledgeable
person at a major modem manufacturer -- not Apple -- said it is 
extremely unlikely that any 1200-bps modem would be able to cope with the
IIc's speed variation ....

The apple spokesperson said that a quick fix for the problem is to set 
7-bit word length, 1 stop bit and no parity (thus enabling ASCII but not
binary file transfers).

                     -----------------

Any other quick fixes?  I just bought a //c and am having trouble 
using my Racal-Vadic -- really need 8 data bits.  Does Apple plan to fix
this?

/Walt/
Buehring%ti-csl@csnet-relay
-------

Message-ID: <20000002@hp-pcd.UUCP>
Date: Sun, 9-Sep-84 13:25:00 EDT
Article-I.D.: hp-pcd.20000002
Posted: Sun Sep  9 13:25:00 1984
Date-Received: Fri, 14-Sep-84 03:03:45 EDT
References: <13168@sri-arpa.UUCP>
Organization: Hewlett-Packard - Corvallis, OR
Lines: 10
Nf-ID: #R:sri-arpa:-1316800:hp-pcd:20000002:000:282
Nf-From: hp-pcd!john    Sep  7 09:25:00 1984

The Sept 17 issue of InfoWorld (pg 63) also has a note about this problem.
Someone found that the IIc will not work with either Hayes smartmodem or a
Anchor Signalman at 1200 baud.Maybe the FTC will make them start advertising
a 1165 Baud modem.

John Eaton

!hplabs!hp-pcd!john