Re: SSC probs

[dalloff@gcfn.org (Dave Althoff Jr)]

Dave H. Hassler (dhassler@OregonVOS.net) wrote:
: Hey gang.  Having trouble with a Super Serial Card.  I have the switches
: set right, HWHS cable, etc.  IBM 7855-10 9600 bps modem (same results with
: an old
: Supra2400).  Using Kermit 0.65 under ProDOS 1.9 on an unenhanced IIe
: (1982).

: Here's the situation: Once Kermit is fired up, I can send commands to the
: modem, and, by the status lights, I can tell it's responding, but nothing
: appears on the A2 screen (like AT&V and the modem's TX light goes solid
: for a full sec.); I can send an ATD command to the modem and it
: dials just fine.

: Now the weird part: I get a CONNECT 9600 message and a USERNAME: prompt
: from my UNIX shell account, but after that, nothing.  Sometimes, the
: keyboard freezes up at that point, too.  I tried sending a CTRL-A E E to
: the card beforehand, and later adding a CTRL-A 3S command to force the
: 80-col. card, but still no dice.

Hmmmm.....

Have you tried setting the card up in a null-modem configuration?

The first SSC I had was giving me all kinds of grief and I just couldn't
get it to work.  Finally, what I discovered was that it was transmitting
at one baud rate and receiving at another!  And neither had any
relationship to the DIP switch settings!  I was finally able to send text
from one machine and get it to come up on the other, but never at the same
baud rate on both machines.

Obviously this was because there was something terribly wrong with the
SSC.  It turned out that the ACIA...the 6551 chip that the card is based
on...had gone flaky.  

Fortunately, Jameco was still selling that chip at the time.  (user grabs
a catalog from the dining room table) Hmmm...Here it is on Page 6 of the
May-July 2000 catalog...the original ACIA, #6551 is Jameco part #43318,
$2.95; the CMOS version (65C51) is Jameco part #43182 and will set you
back $1.49.  If all else fails, you might try replacing that IC...it's a
cheap fix if it works, and if it doesn't work you're not out much. 
Jameco's phone number is 800-831-4242, and apart from ordering some
memory, chip sockets, and an ACIA from them over the years, I have no
connection with them whatsoever.

--Dave Althoff, Jr.
-- 
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