What is a phone card good for? Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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Previously, used cards could be exchanged at the post office, but now, with the introduction of disposable cards, everything has changed.
After the card is over, it can only be thrown away or put into the collection. But do not rush to throw away the used card. It can also serve as an electronic key or password for your programs.
The chip in the calling card has 8 pins, but only 5 are actually used. However, you can get by with only four
Look at the microcircuit: the largest contact in area is "ground"
The location of the remaining pins is shown in Fig.1. As already mentioned, one of the contacts can be omitted. This pin is +5V power. Only Reset, Clock, Data and Gnd pins are used
We connect the microcircuit to the PC using a parallel port. This requires an adapter, the diagram of which is shown in Fig. 2. By supplying the necessary data to port 378h (LPT1 base address), you can read the data "written to the chip. This is done through bit 7 of port 379h. We are only interested in the first four bytes of data, since the rest contain OOh. The first byte read should be is equal to 7Bh.The next three are different for different cards.It should be noted that the information recorded in the microcircuit is constant and never changes, i.e. does not depend on the remaining number of minutes
Below is the text of the program that reads the information from the card.
Program TeleCard;
uses crt;
Const;
Copyright=;'(С) Филютич Алексей, 1997';
Var;
i,j,dat: byte;
Data: array [0..3] of byte;
{--------};
Function ReadCard:byte;
var;
S:byte;
begin;
asm ;
mov dx,379h ;
in a1,dx ;
mov c1,7 ;
shr a1,c1 ;
mov S,a1 ;
end;;
ReadCard:=S;
end;;
{--------------};
Procedure WriteData (A: byte) ;assembler;
asm;
mov a1,A;
mov dx, 37Bh;
out dx,a1 ;
end;;
{------------};
Procedure Next; {Увеличить адрес};
begin;
Delay (1) ;
WriteData (0);
WriteData (2) ;
WriteData (0);
end;
{--------------}
Procedure Reset;
{Сброс микросхемы в исходное состояние}
var
A:byte;
begin
WriteData (0); {Сброс}
WriteData (1);
WriteData (3);
WriteData(l);
WriteData (0);
for a:=0 to 9 do
Next
WriteData(0); {Сброс}
WriteData(1);
WriteData (3);
WriteData (1);
WriteData (0);
end;
{-------------------}
Function Dec2Hex (value:byte): string;
Function d2h (value:byte): char;
begin
case value of 0..9 : d2h:=chr(value+$30);
10..15 : d2h:=chr(value+$37);
end;
end;
begin
Dec2Hex:=d2h(value diy $10) + d2h (value and $0F)
end;
Begin
Reset
{Читаем первые четыре байта}
for i:=0 to 3 do begin
dat:=0;
for j:=0 to 7 do begin
dat:=dat+(ReadCard sh1 (7-j));
Next;
end;
Data[i] :=dat;
end;
Reset;
If Data(0]<>$7B then begin
writeln('Карточка повреждена');
Halt;
end;
write('Данные из карточки:') ;
for i:=0 to 3 do begin
write(Dec2Hex(Data[i]:3);
end;
writeln;
End.
An electronic key made from a card can be used as a password in data encryption systems, a key to launch programs, etc.
Author: A.Filyutich, Minsk; Publication: N. Bolshakov, rf.atnn.ru
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