Help Building Eeprom Reader
Posted 28 June 2009 - 11:07 PM
Posted 29 June 2009 - 01:13 AM
Posted 29 June 2009 - 01:48 AM
You might want to search for rex xbox scene i2c. That is an older eeprom reader design and npn transistor may be easier to find than zeners.
Posted 29 June 2009 - 11:30 AM
Place the 2 1N4007 diodes in place of the zeners.
Place another 1N4007 in serie with the DTR signal, it's kathode (the line on the diode) facing to the DTR signal.
Place another 1N4007 in serie with the RTS signal, it's kathode facing to the RTS signal.
So, you will have DTR - resistor - diode - CTS - diode to GND
and also RTS - resistor - diode - diode to GND
RTS is also connected to DSR
DTR is pin 4 on DB9
GND is pin 5 on DB9
DSR is pin 6 on DB9
RTS is pin 7 on DB9
CTS is pin 8 on DB9
If you can't find a DB9 connector, go to your local computer shop. He might have some DB9 male to DB9 female cables. Just make sure the connectors have housings that can be opened. Otherwise, you need to be sure that the pins you need are also connected to wires.
The modified schematic works (I have used it.), but like the original, it might work on some pc serial ports and not on others, since the rs232 standards aren't followed to the letter.
The diodes can be any small signal Silicium diode like the 1N4148 or the 1N914.
They are cheaper than the 1N4007 which is a 1 Amp diode.
If you don't clearly understand the modified schematic, don't try it out. Ask for help first. I might be ale to make a small drawing if I find the time.
Posted 29 June 2009 - 02:45 PM
Edited by Spence67, 29 June 2009 - 02:45 PM.
Posted 29 June 2009 - 09:58 PM
Sometimes you can find them in an old (defective) net adapter or in an old clockradio.
I am sure you will find several on an old television pcb.
If your local garage has some defective pieces of car electronics, you will probably find diodes in it as well.
Posted 29 June 2009 - 11:37 PM
Posted 30 June 2009 - 02:07 AM
Edited by Spence67, 30 June 2009 - 02:11 AM.
Posted 30 June 2009 - 02:40 AM
Posted 30 June 2009 - 04:28 AM
SC --------|\|--------|--------/\/\/\/\------- pin 6 and 7
xbox vcc ----|/|-------|-----------|/|------- gnd
|----- /\/\/\/\ ------------ pin 4
SD --------------------|-------------- pin8
diodes 1N4148 or 1N4001-7
should work if the xbox is powered up (will not work for reading a eeprom by it's self )
Posted 30 June 2009 - 02:22 PM
Edited by Spence67, 30 June 2009 - 02:23 PM.
Posted 30 June 2009 - 03:02 PM
Posted 30 June 2009 - 05:29 PM
Posted 30 June 2009 - 08:26 PM
The VCC is the 3V3 supply rail of the xbox. I know for sure that on 1.0 and 1.1 xboxes the eeprom chip is powered by that 3V3. It could be the 5V rail on the 1.6 model. The only way to know for sure is to measure it. You can't damage something if you skip with the 3V3 supply rail.
Just make sure that wire is decent connected. If it disconnects, the SDA voltage can increase to 8 to 10V, and the eeprom chip can't handle this. You have a 3V3 hole on the LPC holes.
If you connect the reader to the xbox and the pc, the xbox will frag if you power it on. For a 1.0 - 1.5 xbox, that's not a problem. After the frag, when it flashes red and green, the 3V3 power stays on. A 1.6 xbox turns the power off after the frag. You can leave the pc disconnected until the xbox is running.
If you manage to get the eeprom.bin file, check it with the liveinfo beta 3 program. It's serial number should match the one on the bottom of your xbox.
Posted 01 July 2009 - 12:24 AM
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