Iron - diagram and description of the simplest Vicomm modem.

(c) Timon                                 
                                          
  Hi Speccy World!        
                                          
    Hello everyone who wants to have a modem and
maybe he himself doesn’t even know what he wants
you need this device. Not by any words or
emotions cannot convey all the need, the importance
the beauty and thrill of this device! -!-!  
                                          
    We invite you to collect simple-
shi(see diagram) VICOMM-MODEM.  This scheme
is nothing more than a hybrid circuit VICOMM
MODEM`a from FLASH INC,VICOMM 3+ from Phantom
Family and my i.e. Temuhoro imagination.
    This modem is based on its capabilities
is hardly inferior to VICOMM 3+,and the maximum
the exchange rate is as much as 13.846
MB/day.                                 
                                          
Note. ed.: Simply put, 2400baud.        
                                          
   It is very quick to assemble and set up 
simple! I have already made three pieces and they are almost
It worked without any adjustments.  Connect this
A modem to a computer is simpler than a steamed turnip.    
    There are only 5 (five) wires (!), unsoldered -
directly onto the computer board and no modifications
no current required in the computer, at least
in Scorpion`e and in ATM Turbo 2+.          
                                          
  Modem device.       
                                          
    The main task of VICOMM`a is -
DC isolation of node "comp-
telephone line" and "telephone line-
computer" and connecting them via alternating current.    
    To transmit a signal to the line it is used
optocoupler (LED and photodiode in monolithic
performance, interconnected only
optically) type AOT101AC, LED which
it is included in the emitter circuit of the transistor
VT1 type KT315 (current amplifier). LED
when applied to the base of the transistor log. "1"
glows and from this the resistance of the photodio-
Yes, it sharply decreases to almost zero.
A photodiode paired with a resistor R6 forms
like a voltage divider to which
the base of the transistor is connected VT2  type
KT940, which turns out to be
is actually closed to a positive pro-
telephone line water, with resistance
the collector-emitter section of this trans-
zistora decreases sharply.  What gives us
another current amplifier, it transmits
line signal.                           
    Due to the fact that the optocoupler transmits
information in only one direction - from
LED to the photodiode, then to read the information
formations from the line i.e. to receive you need
another device.  Of course you can use
use another optocoupler, but it's great
will complicate the circuit because the variable is composed
signal from PBX (automatic tele-
background station) is far from sufficient for
control of the optocoupler, therefore in VICOMM 3+a comparator is installed, similar to a reader with
tape recorder in Spectrum.But why do we need to
install another comparator when the computer
Do you already have the same “miracle”!? Therefore in
I did it simpler with this modem: I installed
transformer, as done in VICOMM`e from
FLASH Inc.                                
 The design of the transformer will be described
rank below.                               
     So this transformer transmits
variable component of the signal, providing
while also providing a normal decoupling
current from the telephone line, and from the output
transformer the signal is quite sufficient
accurate, for normal operation of the comparator
- which is what we need! To secure the entrance
comparator against random voltage surges
(loud clicks, ringing, etc.) in the installation circuit
diodes are installed VDЗ and VDCtype KDS22, which
which do not allow the output signal to
transformer jump out of bounds
0.5-0.8 volts.                            
LED VD1 indicates that currently
moment the transmission key is closed.             
    LEDVD2 - power indicator.     
    LEDVDS -indicator of activity
NI.                                      
Note. ed.: any of the indicated LEDs
can be painlessly removed from the diagram. But
To do this, you also need to remove the resistors,
accordingly:                           
               VD1-R2,                    
 VD2-R3,                    
 VDS-R5.                    
Thanks to this removal, the already simple
This scheme will become even simpler.               
                                          
                                          
  Assembly of VICOMM.        
                                          
    All elements of the circuit VICOMM` are located
are mounted on a printed circuit board made of foil
fiberglass or getinax.  Size
boards -approximately 70x40 mm.Approximate drawing
The same of this board is attached.               
 All you have to do is make a board and distribute
put it in accordance with the diagram, to which y
For example, it takes me 2-3 hours.  But
how much time is saved on transferring information?
formation, which previously had to
go somewhere, swim, fly or use
use the services of our super-fast
mail.                                    
                                          
                                
    The transformer is quite easy to manufacture
maintenance. Take the transformer from service
transistor radio reception has expired
Nika, there are usually two of them, one separated
day, and the other is weekend (the one in the block
no power supply!). So, do you take-
necklace or something like that and measure-
eat any of them (they are usually the same
sizes) and if its core has a high
and the width is approximately 2Omm, then it is quite
it will come.                                   
    Unsolder it, but so as not to
trim the coil frame. Next, you carefully
disassemble the core (it consists of some
number of metal"W"-image-
nykhplates), completely unwind everything
windings  Then wind the winding in
300 turns of 0.1 mm wire. Both pins
must be brought out. Then wrap-
You wrap these turns with two or three layers of electrical tape.
The electrical tape must be tensioned so that
it fit tightly around the coils.  On duct tape
wind another 300 turns on top of the same
wires and wrap them again with electrical tape. Here
we got two windings, electrically
as if they are not related to each other.             
    Now you need to assemble the core into
the reverse order in which you
sorted it out.  Then solder the four pins
windings to the legs on the frame, if any
available.The terminals of one winding must be in
winding on one side, and the second winding -
on the other. This is the assembly of the "expensive"
product is being completed.                      
                                          
  Connection to a computer.    
                                          
    The modem is connected as follows:
open your computer and find
computer board common wire and +5 volts.
solder the corresponding wires to them from 
modem boards.                             
    Then connect the modem output to
computer tape input i.e. at the entrance
comparator.                              
                                          
Note.  ed.:24 contactfrom the bottom side
board, on the peripheral connector Scorpion.   
                                          
    Next, look on the computer board
chipfrom which beeper and output
for recording on a tape recorder.              
                                          
Note.  ed.:usually it is TM9 IC.           
                                          
  To where the output to the tape recorder goes (you-
water 7 DDЗ5) straighton the leg of the microcircuit
solder the wire, the other end of which
solder on the modem input i.e. the base of the trans-
resistorVT1.                              
Wire On Line connects to bit 5
port #FE (pin 12 DDЗ5).                
Wire Ring connects to the 5th bit port
that #FE (5 pin DDЗ7).                    
                                          
Note.  ed.: In the scheme Scorpion 12 output
DDЗ5 is not used.                     
                                          
    The pinouts of the microcircuits are shown according to the diagram
Scorpion ZS-256 Turbo+.                   
                                          
Note. ed.: In addition, the modem can be connected
connector to the printer connector using the appropriate
The relevant bits of this interface. But
then you will have to change the port addresses indriver of the terminal you are using
you know. You can find out how to do this by
phone number at the end of the article.                  
 To computers other than Scorpio can-
dem connects in the same way. Problems can
can arise with #5 bit of port #FE - its
it may simply not be in your computer's circuitry.
The solution to this problem for computers Profi and  
Pentagon  described described in the other two
articles in the same section.                 
  If you have a different computer, then call us, 
and we will help you connect the modem.        
                                          
    Setting up VICOMM.       
                                          
    Modem correctly assembled from working parts
parts starts working immediately, but when
if necessary, select the resis- tance
resistor  R4 so that when connected
In this case, the voltage in the line was within 12
- 16 voltswith the transmission key open.
                                          
  Software.    
To work with this device,
There are several programs. From them follow-
There are only three programs to note.             
    MacroModem v2.20 and BBS 3159i. First
allows for the exchange of information with
another computer equipped with a piece of hardware,
similar to VICOMM`y.  Moreover, the exchange can be
produce even without personal participation
your subscriber in this event.       
   BBS 3159i allows you to organize BBS
Spectrum-based with modem (read:
VICOMM).                                  
    The latest program that appeared with us is
E-MODEM STATION v2.55.This program did not have
documentation with us, but nevertheless we
have already appreciated it.Especially
a driver that allows you to speed up the exchange a little
data.Also EMS v2.55 allows you to organize
callBBS`ku.                           
                                          
     Принципиальная  схема.     
                                          
        
        
        
        
        
        
        
        
        
        
        
        
        
                                          
     Пример печатной платы.     
                                          
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
     
                                          
Прим.ред.: на  чертеже  печатной  платы не
учтена часть схемы отвечающая за автомати-
ческое  поднятие трубки. На принципиальной
схеме этот участок выделен пунктиром.     
                                          
      Перечень элементов.       
                                          
┌--------┬-----------------┬-------------┐
│Поз.    │ Наименование│Note │
├--------┼-----------------┼------------┤
│С1,С2 │ 0 .5 µF │ │
├--------┼-----------------┼------------┤
│R1 │ 200 Ohm │ │
│R2,R3 │ 1 kOhm │ │
│R4 │ 200 Ohm │ Select │
│R5 │ 2 kOhm │ │
│R6 │ 1 kOhm │ │
│R7 │ 650 Ohm │ │
│R8 │ 10 kOhm │ │
│R9 │ 6.8 kOhm │ │
├--------┼-----------------┼------------┤
│U1,U2 │ AOT 101AC │ * AOT110, │
│ │ │ AOT128 replacement-│
│ │ │ in relation to-│
│ │ │ in accordance with │
│ │ │ pinout. │
├--------┼-----------------┼------------┤
│VD1,VD2 │ AL 307 │ │
│VDЗ,VDЧ │ KD 522 │ m/b KDS21 │
│VDS │ AL 307 │ │
│VDb │ KD 522 │ m/b KDS21 │
│VD7-VD10│ KD 209 │ │
├--------┼-----------------┼------------┤
│VT1 │ KT 315 │ any letter │
│VT2 │ KT 940 │ any letter │
└--------┴-----------------┴------------┘
* When replacingAOT101 with AOT110 (128) required
we need to connect the base of the phototransistor (it
located inside the optocoupler) with its own emitter
rum through resistance 100 kOhm.          
                                          
                                          
│VT2 │ KT 940 │ any letter │
└--------┴-----------------┴------------┘
* When replacingAOT101 with AOT110 (128) required
we need to connect the base of the phototransistor (it
located inside the optocoupler) with its own emitter
rum through resistance 100 kOhm.          
                                          
                                          
    Our coordinates:         
                                          
Phone 1: (383-2) 79-55-83 Artem         
 It is better to call here regarding iron issues. 
Phone 2: (383-2) 61-95-38 Kostya         
Ahere for questions related to programs.   
                                          
Р.S. Preferably parallel to the relay winding
connect a diode, for exampleKDS22,to
prevent failure of the microcircuit to
to which the wire is connected On Line.