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The Packet Radio “2 N 1” Handbook by Buck Rogers K4ABT

Section 1; Packet Radio “The Basics” Section 2; The X1J4 System Node Operator’s (SNO) Handbook

Section II; TheNET X1J4 System Node Operators Handbook __ Page 19

SECTION II; The X-1J4 System Node Operator’s Handbook!

Chapter Five

WHAT IS A PACKET NODE ?

The X1 node is beginning to attract many users, and it is

a "natural" for our Local Area Networks (LAN)

frequencies. Not only can it be used as a node to connect

out of the LAN. It also doubles for use as round-table

packet session when using the "TALK" command/mode.

In version X1J, there is an add-on hardware modification

that allows the users to examine their deviation

(modulation) level. If there is too much or too little

deviation, the users can adjust it accordingly. Further

connects to the node will allow them to determine when

the Frequency Modulation (FM) is set to the correct

swing.

The outgrowth of this node can be used for networking,

in a network of several nodes. There are many features

that time and space prohibit explanation here. To find

out more about this new networking node see the August

and September 1993 issues of CQ magazine.

The X1J code is burned into a 27C512 EPROM which

fits into the TAPR TNC-2 or clones, such as the

MFJ-1270C, and MFJ-1274C.

By now you are aware of the need for an EPROM burner.

One of the EPROM burners that I'm most familiar with is

the PB-10 from Needham Electronics. The PB-10

EPROM burner supports the latest EPROMS for user

friendly program for EPROM maintenance.

As I described in the August 1993 issue of CQ magazine

(PACKET USERS NOTEBOOK), the EPROM for the

X1 node is burned into a 27C512 EPROM in two parts.

The Needham Electronics EPROM burner makes the

process easy because we can set the first address to blow

the EPROM from 0000 to 7FFF, then the second half of

the EPROM is burned from address (HEX) 8000 to

FFFF.

The EPROM programmer makes the job easy is through

if it has a Zero Insertion Force (ZIF) socket.

The ZIF socket of the Programmer should accept several

sizes of EPROMS including the ONE MEGABYTE

EPROMS (27C1001, 27C1010 etc).

INITIALIZING:

Once the EPROM is installed into the TNC2 or clone,

the initializing process is easy. Turn it ON, set the

parameters, the rest is history.

The node sends out update broadcasts to inform other

nodes that it is active. The operating parameters are set

in the firmware and are available for easy changing by

the SYSOP. The parameters shown under the "P"

command of the X1 nodes parameters are similar to those

used in the early thenet 1.01 node. However, in the

X1J4, there are additional commands contained in 6

other parameter sections. These are associated with

specific functions and features like the MODE (17

commands), METER (10 commands), MTU, IP

addressing, ACL, and ADC 1&2.

The credit for this new network node firmware goes to

the developers; They are:

Dave Roberts G8KBB

Dave is the author of the X1 code. The X1 version is

based on the original thenet 1.01 platform that was

developed by the Nord><Link group.

Neville Pattinson G0JVU

Neville supports the hardware projects associated with

the X1 node(s).

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