LABORATORY
Something About Phone Cards
(C) ART
Well, I again decided to write a couple of
lines. I would like to draw attention to the
that the people had forgotten what
Spectrum. Just recently, I tried
connect with friends from Taganrog, and as a result ran into
PC-BBS. But the conversation today do not go about "the problem
Spectrum, but about real things. I recently
zaimel software on the PC for charging the phone
cards. Long and hard collecting device,
and finally, lo and behold, it worked. Little
play around, and decided to do the same
on the old Speccy. We've got enough good old-fashioned
"Raton" and began slowly to break down,
sawing, etc. .. After a few days
torment (and that it in no other way to call
not), I have something turned out.
Probably not now an open secret that
Gomel our cards are made on the basis of
chips DRUID. What is the this
chip, I did not understand, but processing of the
read signal bytes I managed to learn. Connection scheme is
almost the same as and PC. You can certainly connect the device
to 1589VM1, but much easier to write software for
Standard CENTRONIX.
CENTRONIX Card
1 RESET
+5 V GND
2 CLOCK
RESET N / A
3 DATA
CLOCK DATA
4 GND
N / A N / A
Here is the scheme itself connections. Knowledgeable people
will see similarities with the scheme Readera Card, but do not
worry - they look like, because way signal processing as a PC
and a Speccy the same (in my opinion):
CENTRONIX CARD
March 1
STRB CLK
February 1
D0 VCC
July 3
D1 R1 DATA
4 / 51K 2
D2 RST
May 5
D3 GND
6
D4 K
7> <
D5
8
D6
9
D7
10
ACK
11
BUSY
1914 VD1
AFD | <|
16
INIT
18-25
GND
12
PE
1 ... FOOD
2 ... RESET
3 ... CONTROL
4 ... N / A
5 ... EARTH
6 ... N / A
7...VVOD/VYVOD
8 ... N / A
5 6 7 8
1 2 3 4
Firstly, people do not build illusions
Spectrum - it's not PC, so not everything is so
simple as it sounds. And secondly, I do not
tormented I was able only to count
dump the cards, but with the record is clear
problems. With the structure of the special problems of the
dump was not the way here it is:
(All the computation time is doubled in value).
Map:
0x00 - 0x21 is always;
0x01 -?
0x02 -?
0x03 -?
0x04 -?
0x05 - 0x02 is always;
0x06 - 0x11 is always;
0x07 - The date of manufacture
0x08 - The date of manufacture
0x09 - checksum for bytes with addresses from 0x00 to
0x08
0x0A - 0x00 is always;
0x0B - max. the number of minutes * 2;
0x0C -?
0x0D -?
0x0E \ working counter'y (filled first
... | - A sequence of decreasing
0xF8 / numbers up to 0x07)
0xF9 -?
0xFA - a 0x01 or 0x09 or 0x0A;
0xFB - 0x60 or 0x61 (?);
0xFC - 0x01 is always;
0xFD - similar to the number of update'ov;
0xFE - cell address of last update'a;
0xFF - address the current cell.
Many of our craftsmen claim that they
a perpetual card without resorting to
Scotch tape and using a 4 th and 8 th leg
chip. People! Do not reinvent the wheel. These
legs are not used automatically. It is also not
stands to suffer if the last cell
written down value of FF. In his time in the bowels of FIDO was
a big noise, and some pots had threatened to collect cards for
the emulsion LA shkah, so do not be like them. The only way -
to collect an emulator that PIC16C84 (in InterNet have multiple
sites which are devoted to this issue. There are of course, his
grandfather's methods sealing tape legs CLK, but here's the
Trouble. Recently I was in Minsk, and when he began to call from
automaton, then there also got half of his
cards. Who zainteresuet this question
then please lady, write!
246012, Belarus, Gomel, Student proezd-9/28.
E-mail: Shaulousky_Yahor@SoftHome.Net
Fido: 2:452 / 112.22, or write to the newspaper "Polesie".
Your humble servant, Yegor Shavlovsky.
