Medem - The history of Zaporizhzhya modem.

<b>Medem</b> - The history of Zaporizhzhya modem.

  (C) 1997 Corporation Zaporizka Sich

              ZSC - MODEM

         (C) Steve, (C) Alex
________________________________________

Instead of joining ......


  First of all, I ALEX on behalf of our entire Corporation ZSC 
want to give many thanks to all the people who, despite all the 
existing difficulties, despite everything involved SPECTRUM'om 
and Freedoms characteristic time of making the program involved

development of iron, introducing fresh ideas!

  Thank you so much, I express avtoram journal
nals Faultless, Spectrofon, ZX-Format,
Speccy and others. Because of these electronic
denmark so essential Spectrum-world.

  We are all members of our organization, as
trying to do something to extend
life of this wonderful computer: in our spare time we are 
releasing the program journal Nala, the system Soft, as well as 
just a hack Kerim, breaking something fell into our clutches.


  But now, specifically about our new design, which should 
appeal to many users ZX. 

  I give the floor to my colleague Steve, to
tory specifically talk about opportunities
and the virtues of ZSC Modem'a.

  In recent years, the world's energetic
people and high technology, where the main
value and the weapon is information,
the concept of "communication" stands for access to
World Bank data - Global Com
puter networks.

  No one disputes the advantages of electronic mail as compared 
with the usual letter, and about opportunities in the INTERNET

on-line mode and say nothing - is
just kruto.Tolko you can get
any information from the morning
news archives coming out ever
newspapers and magazines, and ending videos and landing on Mars 
research unit Pathfinder. And what we have, on SPECCY? Again 
the "brake world progress?". Fortunately not. 

  Russia already has a lot of networking, with the possibility 
of the INTERNET and FIDO, a for Ukraine?


  Until recently, many readers
electronic newspapers and ON-LINE ZX-NEWS unfortu
Lely absence of such a relationship with us and
wondering - would it all
ever with us?

  Yes, now it's safe to say that it's not far off. And when 
possible possibility of no worse, and even full of a degree is 
better than there. What are the opportunities you are provided 
with your modem? Using our modem you finally solve the problem 
of data exchange. You do not have to traipse to the icy winters 
nyuyu time with disks to each other for new SOFTOM. Not to 
mention the programmers, working on the same program, but I live

ing (as often happens with us) far apart
from each other. Enough to load terminal
gramme and to transfer the files over
minutes - and no problem!

  In addition, you can use
services already available BBS (including
VICCOM-ovsky) or create a
VICCOM compatible, and radically different (certainly not for 
the worse) station. 

  What is a BBS and what opportunities are available to users 
was sufficient but is described in detail in the electronic 
newspapers ZX-News and the magazine ZX-Format, so I will not 
stop there and get down to business (long overdue!). Now 
specifically about our modem. 

  No doubt many of you know
some already existing and active modem on SPECTRUM. In what
differences from the rest of this modem.

  The word modem is short for
words modulator, and as it turned out most of the active 
promotion of Fix to date "modem" for

SPECCY (ZX-MODEM, VICCOM, C-DOS) no
that one or the other, that is inherently
they are not worthy of the name "modem" and the most correct 
such "fun" name "Aligner." You may ask, "What

do they work? ". It's very simple - the modulation
and demodulation is performed by software.
Performance is quite SPECCY allows
exists at a speed of up to two or three thousand bits per 
second. But with such "jokes" can forget

of dial-up games in real time. TA
MAYBE SOMETHING TO SPECCY ONLY WITH THIS MODEM!

  Some offer to connect to the SPEC
CY internal modem for IBM-compatible
machines (HAYES). With regard to popular
Modem (14400) it will cost you $ 75
(At least), and the notorious modems
2400 are no longer available, they can
get to work and only used (a good
chance to some PC user to finally
get rid of this outdated devaysa,
as the used toilet paper).
Moreover, experiments showed that in most cases even with 
respect to a PBX, they operate at an average rate of 900-1200 
bit / s, because they clearly not meant for "shovels" lines.

If you want to take it to communicate with IBM
BBS, I can assure you that a lot of system
Sopov a "brake" just will not start
(Requires at least 9600), not to mention
that the PC 80 characters per line, while
you??

  You should also pay attention to
galvanic isolation of the six signals
optocouplers, which allows the modem
fully monitor the line and determine the number. Possible 
connection options modem directly to the wires-it is natural 
speed will be maximum. So you can connect more than two

computers and a network, as well as
modem will not be restricted to a narrow strip
frequency telephone - it can be rebuilt to a higher speed - up 
to 19200 bps. It is also possible to connect

to the radio. (This is most important for those who do not have 
a phone, but there each computer, living a relatively

close).
 In my opinion, the ZSC modem we have achieved the greatest 
advantages for the lowest price. The modem connects to

muses. processor with two input ports -
O AY-8910, YM2149F (40 feet). You can connect the modem to the 
processor buses If the power supply in the computer and the 
monitor have no galvanic connection to earth lei (network) then 
you can take a modem without galvanic isolation (slightly 
cheaper version of the modem).  Naturally, all the 
functionality of a modem are stored. 

  How to check the power supply?
If you have a color monitor (TV)
or the computer used a pulsed
power supply, then most likely you will need
version of the modem with the outcome. If not, then
check computer power supply and monitor on a galvanic 
connection to the land You can make the following two ways (the 
computer and the monitor should be included): 

1. Voltmeter AC plug

   to the computer case and ground (usually

   connects to the radiator).

   If voltage is present, then you

   need a modem with the outcome.

2. Voltmeter is inserted between the shell and

   one of the wire telephone line.

   If you do not have a voltmeter recom
   is to pick up the phone and close the

   the computer first, no one

   then on the other wire tel. line.

   If you will listen on different

   sounds (buzz, hiss), or general

   lost dial tone, you should use

   modem with the outcome.

Now specifically about the possibilities of modem
with the appropriate software. This modem allows you to create
on the basis of fully automated BBS. You can use the convenient
and a popular program in Russia MACRO-MO
DEM (MMD), which is using the driver
ZSC-MODEMa will operate using
all possibilities MMD_2.20 (read ZX-FOR
MAT # 6) and a modem, as in our protocols, and protocol-VICCOM, 
which will enable you to communicate with BBS to

these modems. As on many
ATS is the possibility of free long-distance call (read ZX-News 
20 .. .30)! With this you apart from full compatibility

bridge VICCOM receive additional
possible removal of the tube, the reaction to
call (only available on VICCOMe "s at
bambasom "), caller ID, faster and more reliable transmission 
protocols Data compression and various methods

Mi error correction. While he made ten
protocols with an average speed of 600
Up to 9600 baud. The most effective protocol may be selected 
during the work automatically and repeatedly changed for all 
time communication in both direction increase or decrease speed.

Communication block by block to obtain the confirmation of the 
correctness of the receiver unit. In error block is 
retransmitted.  New versions you can order, get

by mail, or you can update the old
contacting download through BBS via a modem. So think for 
yourself, a modem you're better off for SPECTRUM-and choose. Be

sensible! Do not let yourself be fooled! Spectrum is already 
too conservative platform and its (non) development depends 
primarily on you and on your choice. I hope that you take the 
correct solution, which may predetermine the future of the 
platform.  Since the scope of this article can not fully 
describe the work of our modem, give advice on connecting

and work with a terminal program, I
tried to be as terse and short
highlight the main features of the modem and
its advantages.
 Recommendations for the Connection and Wiring
modem is described in the original documentation. You can also 
get any, the information you need by calling in Zaporozhye (or 
write): 


   To purchase the modem:


          Ukraine

        Zaporozhye

     st. Omsk, 5 square. 16

      (0612) 65-15-10
 Sieve Alexey

           Alex

According to the most modem (Work Connection)
and soft for him:


          Ukraine

        Zaporozhye

    st. Voronin, 33 square meters. 26

      (0612) 68-13-11

    White Vadim A.