anyone notice that the duo 2 gt has an extra resistor near the 3.3v area? what's that for?
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anyone notice that the duo 2 gt has an extra resistor near the 3.3v area? what's that for?
just noticed that myself m8, the ones on mine are all wonky too, i think mines fcuked anyway so i might just whipit off and see what happens
P
have you figured out what the extra resistor is for ? are you thinking if it is removed it might improve the bootrate problem ?
When the PS2 is in standby, the voltage on the 3.3V rail doesn't drop to 0V. It stays a few hundred milivolts above ground. That can prevent the microcontroller to properly reset itself. The resistor helps in keeping the standby voltage near ground, so to have a proper reset.
Very nice explaination, thank you.
yup, interesting to know. Cheers!
there is already a 1K resistor between 3.3v to GND on the Duo2 GT, i think the extra resistor this thread is talking about is the one across 3.3v pad and the transistor and it's 20k in value. don't know what this has anything to do with reset. more likely it's added to improve Vcc quality that applied to the modchip. Adding or removal of that resistor does affect the boot rate through but does not solve the problem. the alternatve Vcc that Duochip diagram suggested by-passed this resistor and other components, which seem to be a filter to me. the problem that current Duo2GT has is something to do with the code when they ported it into an alternative processor. it's the similar situation when the chinese did the clone of duo2 chip. unfortunately, this time the situation is much worse. i hope the duochip team also read this thread and give us an explanation. i love duo chips until i tried this one.
I agree, I was a big fan of the duo2se, I received 5 of the GT's, they arrived 2 days ago, will install a couple this weekend and see what they do.Quote:
Originally Posted by wmb88
I just installed one for a friend and so far it works good, I have no boot issues, Heres a pic of my install.
http://img.photobucket.com/albums/v2...r/2cb59720.jpg
1/4 of the DUO2GT chip have problem. most of them booted only at first time. i have finished 50 chips in a batch and found more than 15 pcs dead after first boot.