On Thursday, September 22, 2011 6:08:30 AM UTC-4, artful_bodger wrote:
Robert Kahle's 2007 post was all I needed to hack the adapter. Using an

8 pin microchip 10f220, I wrote the following code. It's the .HEX If

you want the source PM me.



:020000040000FA

:0800080005281F28A300A40035

:100010000830A2002508A306A30C2508A300031C92

:1000200013281830A306A30C2308A5002408A30056

:100030000310A30C2308A400A20B0A280800A501A2

:10004000F0300620103006200000003006200000AE

:084000000100020003000400AE

:02400E00F93F78

:00000001FF



The code aint pretty, but it works.



This sends a fake 90W signal to the mobo to make it think a dell adapter

is connected. I needed it because I'm off grid and I only have 24VDC.

I step this down t 18V and use the PIC to fool the mobo. Been good for

9 months now.



You'll need an old plug to connect to the laptop and you'll need to

identify +, - and signal (centre) pin.

Connect 18V into the laptop. The centre pin of the goes to pin 3 of the

PIC.

Put a ge diode anode on pin 3, cathode k on pin 2.

Put 0v on pin 7. 330n cap pin 2 to pin 7. You get about 2.5V on pin 2,

which is just enough to power the PIC. The PIC waits about 200ms and

then sends the message when requested by the mobo. There is so little

current sent by the mobo that you can barely light a LED, so only use a

DVM and dont connect anything else!



I've tested it on 2 d610 and 1 d600. Flawless!



You'll need a good grasp of electronics to make sense of this, not to

mention programming PICs. I'm not selling these and dont intend to.



Usual disclaimers apply.

Dear Artful_bodger and Robert Kahle:

It seems like I'm forced to go with your solution using the pic10F220 or re flashing the DS2502 and to practice my forgotten skills in programing with my PICkit 2. I needed the mentioned modification because a Dell D600 has problem with the DC jack and USB ports. So I bought a Docking Station which seems to be happy only with the PA-10 Geniune Chinese PS which I don't have. I opened another suitable Dell PS model ADP-90FB modded using the plug connector from a PA-12 and connected the DS2502 on it. The D600 is able to charge and works fine if I turned ON the laptop,let it pass all posts, and then plug the Docking. With this last process it results the Docking station bypassed its Power(turned off) and obviously not USB's or other Docking hardware is working.

So now after I explained my scenario please let me know the a suitable solution : a working Ds2502 firmware and instructions to load the program;
or a little schematic for the Pic10f220 on its VDD power supply(wanted to be sure the GE diode is detecting and rectifying some induced signals to produce the start up Vcc which is later taking from the output port pin #3).

Best Regards

Werner