MODEM: Myths and Realities.
(C) 21.04.97 Steve
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In recent years, computer networks are the main
and the most perfect view
communication. No one disputes the benefits of e-mail
Compared with conventional letters, and
about opportunities in the INTERNET mode On-line and say
nothing - it's just kruto.A what we have,
on SPECCY? Russia already has ZXNET, and in the Ukraine? Until
recently, time, many have read electronic newspapers ZX-NEWS,
ON-LINE and sorry thought, and whether all
it is ever with us. Enough! AND
in the near future, just as
no worse, and even to some extent better than there.
In this article I will talk about its development ZSC-MODEM,
its advantages, disadvantages, progress to date and their
plans.
What is a modem?
The modem consists of a
board that plugs into a computer
and the telephone linii.Kompyuter -
enough SPECTRUM-48 + TR-DOS.
By purchasing a modem you finally
solve the problem of sharing programmami.Vam no longer will
have to be dragged into the icy winter time (Hot summer) with
disks that especially useful for programmers working on the
same program, but living far away from each other. Enough to
load the terminal program and send files for several minutes.
The beauty of a modem is also a member of
more rapid communication with the Manufacturer drivers
programs, and generally sinkleristami: You can download
yourself a new game almost daily its appearance, play, write
in an e-mail your comments
and wishes. Through the BBS you
can meet and communicate
even with all users
Spectrum in your city, and if
You are not really low on money, and then in other cities. Can
perepisovatsya on any topic, with
someone alone or with all
immediately, giving electronic announcements, publish articles,
write electronic newspapers and magazines to give to the
general study and test their programs, pictures, melody. You
can easily find friends with similar interests, as and you.
If you have any problem, you need someone to help her
decide, for example: you can not get the files of kakuyulibo -
send, can not solve a complex problem - surely there is someone
who will help you. One word better to see once! Once you try
you do not opt out of this ever! This will be for you
lifestyle!
What is BBS?
BBS - is a computer with a modem connected to a telephone
line and in the regime
Call Waiting. On his drive
(CDs) are located any files
you can copy itself at will, or transfer any of their own. It
is also possible work with the "Email -
leave files for specific
subscribers. Anyone can become a sysop (system operator) - When
you open your BBS. It's enough just
announce itself to other network users, for example through
existing BBS. Usually BBS
work at night, since it
times less likely
that will call you a voice and better
relationship that leads to an increase
speed.
What is ZSC-modem?
Now specifically about our modem.Pri develop a modem, I
tried to avoid the shortcomings of other modems (ZX-MODEM,
VICOMM, x-DOS, etc.). And I managed to achieve the greatest
advantages for minimum tsene.Orientirovochnaya
Modem Price: $ 7 - $ 11. If your computing system is installed
with AY two I / O ports 8910,
YM 2149F (40-foot), then you can
order a cheaper option,
connected to the ports of AY. If
Your power supply in your computer
and the monitor does not have a galvanic connection to ground
(the network), then you can also buy cheap
modem. Naturally, all of the modem are stored.
How to check the power supply?
Check computer power supply and monitor on a galvanic
connection to the land can be made in the following ways (for
This computer and the monitor should be included):
1.Voltmetr AC
connected between the "common" computer and the earth (usually
connected to the radiator). If voltage is - such an option
You do not do).
2.Voltmetr switched between
housing and one of the wires telephone line. If you do not
voltmeter, you can pick up the phone
phone and close the computer case, first one and then
on the other wire telephone line. If nothing changes -
everything is fine. If you will listen on the different sounds
(buzz, hiss), or disappear altogether beep - you will have to
take the modem to the "decoupling".
Now specifically about the possibilities of a modem with an
appropriate software.
This modem allows you to create on its basis a fully
automated BBS. The modem produces a "withdrawal of the tube, a
set of number, issuing requests to the modem
partner. If the modem is in
standby mode and receives a call is made avtopodnyatie,
checking for requests from another
modem, if they do not (you can also
someone to call) - signals, keep the line and gives it long
horns, similar to a dial tone ATS.Esli you picked it up, it
releases the line and goes into standby mode (can talk). If you
have not picked it up, then a certain number of calls
it also releases the line (if
You are long gone or asleep at the computer). If you do not
want to talk, just press BREAK.
If you have Caller ID, you can either disable it
avtopodnyatie, or install the program operation with AONom - in
this case receiver removes the caller ID, and a modem connected
in parallel only parses the line and in the case of signal
intercepts (a makes it possible to determine AONu
number). When you call to another
modem, you will see the folders (your
and partner), can send
files from your disk, download
its files. If you are more minutydvuh not doing anything, then
the connection will be automatically terminated
(Time - money). When you're finished, you can interrupt the
communication in advance, or transfer the management of
partneru.Takzhe can be in the same program to view the
downloaded images. Already made ten minutes with an average
exchange rate from 1200 to 12000 baud. The most effective
protocol is selected during operation automatically and can be
repeatedly changed for all time communication in towards an
increase or decrease skorosti.Svyaz poblochnoya with receipt of
an acknowledgment from the receiver correctly bloka.V error
block is retransmitted. What are these "Complexity" - to
protect against mistakes. It's no secret that We use the most
heinous PBX and phone lines in the world. IBM-Famous-native
modems in most cases are designed for our line and operate at a
lower speed than this, if not working! When commissioning and
testiravanii our modem were cases where
at the same time of day worked fine for our modem (although
rate was lower than at night)
and completely nedorubalsya IBM-ovsky.
On most files can be
reduce the transmission due to
built-in quick kopressora
and decompressor.
Now we are working on a version of
supports 128K and above, with a more beautiful and
user-friendly interface (such as WINDOWS), with the possibility
of determining rates, may be to improve the communication
protocols will have another compressor. New
version, you'll get through
modem.
As currently planned
establishment of a full version of the server
BBS for the program's many features IBM-ovsky BBS (meaning
complete, and stores the subscribers, their identity (in
including on the determined number) for different users
different access.
Possible connection options
modem directly to the wires - at
Naturally, the speed will be
maksimalnoy.Takzhe can connect to the radio (this is most
important for those who do not have a phone, but a friend with
computer, living a relatively close).
Well, like all the most important
described. Who has questions -
call (phones in the city of Zaporozhye):
Technical advice:
68-13-11 Vadim Bely
(Steve)
Soft modem:
64-08-69 Kramarenko Vladimir
(Crazy Doctor)
To purchase the modem:
65-15-10 sieve Alex
(Alex)
As for me, I'll continue to deal with
hardware expansion is Speccy, and
programmatic support for their dorabotok.Skoree total number of
the following items will be given to specific schemes with a
description of the principle of work and recommendations
assembly and adjustment.
Until next time!
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