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Simtel MSDOS 1992 June
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TAPR116K.DOC
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1989-02-15
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105 lines
Note:
If you are upgrading from 1.1.3 or older versions you will need to
perform the 1.1.4 modification before using this release. Contact
TAPR, P.O. Box 12925, Tucson AZ, 85732. (602) 323-1710
***********************************************************************
November 7, 1988
TNC-2 Software Release 1.1.6 Notes
----------------------------------
This document describes the differences between the latest
release 1.1.6 and the previous (1.1.5) release of TAPR software
for the TNC 2 Terminal Node Controller.
The reported checksum on powerup is $2E.
This release include "KISS" capability from K3MC.
NEW COMMANDS
------------
KISS ON|OFF default: OFF
This command is used to enter the "KISS" mode for operation with
various experimental protocols. KISS is used with intelligent
host computers. The most popular use has been in conjunction
with the KA9Q TCP/IP networking software, available from TAPR and
elsewhere.
To operate KISS with this release, enter the command KISS ON,
then the command RESTART (NOT RESET!). The CON and STA LEDs will
flash three times when initially actiated. This command will
then have effect for subsequent power on/off cycles. To return
to normal operation, enter the command PARAM <device> 255 at the
NET>
prompt if you are running the KA9Q TCP/IP software package. If
you cannot send this parameter with the software you intend to
use, you must power the TNC off, then disconnect the bbRAM
battery for several minutes, then reconnect the battery and power
up again.
NOTE: While the TNC is in the "KISS" mode, normal TNC
operation is suspended and the familiar command set is
inoperative.
TXUIFRAM ON|OFF default: OFF
This command deterines whether the TNC will transmit most
unconnected information packets.
Setting TXUIFRAMe OFF will prevent all but BEACON and ID
unconnected ("UI") frames from being originated and transmitted.
This is most useful for BBS and other stations which tend to
leave unacknowledged data in the TNC transmit buffer when a
connection is lost. The normal behavior of a TNC would send the
buffered data as "UI" frames, adding to channel congestion.
The behavior with TXUIframe OFF serves to reduce channel
congestion because the now useless data is never sent.
NOTE: TXUIFRAM has NO effect on the digipeating of UI frames.
It only affects frames being originated at this
station.
CHANGES
-------
o - The TNC now requires that the Data Carrier Detect (DCD)
signal from the internal or external modem be asserted
(true) for a packet to be received. This change is intended
to ensure that a modem with a "threshold" control is set
properly.
The result is that the station operator will set the DCD
control in order to receive data. This then ensures that
the TNC will have the best chance of detecting other station
activity, reducing collisions that would otherwise result
from jumping on a channel believed to be open when it is
really in use by another station.
This protection feature will be invisible to most operators.
NOTE: To test with digital loopback, FULLDUP must be ON. For
normal operation, FULLDUP should be set to OFF.
THE PACKET REVOLUTION REVOLVES!
Howard Goldstein N2WX
TNC-2 Software Design
'n
Damage Control