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If you've lost Touch Memory... (ASM & BIN)

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tpetar

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Если Вы потеряли Touch Memory... (Ридико Леонид Иванович (wubblick@yahoo.com))
If you've lost Touch Memory ... (Ridiko Drozdov (wubblick@yahoo.com))
Original Web address: Touch Memory... ( (wubblick@yahoo.com)) - guarda.ru
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Recently, many organizations, and sometimes at home, there were door locks, key to which is the tablet Touch Memory Company DALLAS. If you have lost a key, then, in contrast to simple metal key, you will make no duplicate because of the second, exactly the key, not in nature. All keys are made by DALLAS, has its own unique number, which is never repeated. So if you've already lost Touch Memory, to help grief can not be. But if you have not lost it yet, you can insure against the risk to remain without a key. Due to the fact that the door locks in most cases using Touch Memory type DS1990A, which has no means of protection, it can easily be simulated on the microcontroller. So while still on the tablet is not erased serial number, copy it, and making the ROM of the microcontroller, you can pretend this is the key.
Schematic diagram of the device shown in Fig. The scheme is very simple and requires no special explanation. The output of the simulator is a port of the microcontroller INT0. It established a chain of protection, consisting of a resistor R1 and zener diode VD1. The device is powered from the battery voltage of 4.5 V. If we apply the microcontroller in the body SOIC, and a battery to use the three elements of type SC-32, the device can be very compact. It can be embedded, such as a pendant.
The serial number Touch Memory fits in the boot file tm_sim.bin, starting at address 10H, a total of 6 bytes. To enter numbers in the same sequence in which they go on the housing Touch Memory. For example, the number may be so: 000002D6B41F. The seventh byte is a code family (family code) Touch Memory. For DS1990A he is always 01H. Other Touch Memory family of fully simulate the impossible. Checksum (CRC) is calculated by the program automatically, its input is not necessary.

The source code contained in a file tm_sim.asm, the file contains a description of SFR libreg.asm 8051, necessary for the compiler TASM 2.76.
 

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