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Old December 14th 07, 06:22 AM posted to alt.sys.pc-clone.dell
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Default Dell PA-10 ac adapter center pin

New update....since my last post on this subject I've written a
firmware for a microcontroller to read the memory chip in these power
supplies...this is the eeprom dump from it

002100: 11 17 E1 6C 02 00 00 C2 ...l....
002110: 44 45 4C 4C 30 30 41 43 DELL00AC
002118: 30 39 30 31 39 35 30 34 09019504
002120: 36 43 4E 30 44 46 32 36 6CN0DF26
002128: 36 37 31 36 31 35 36 32 67161562
002130: D0 FF FF FF FF FF FF FF ........
002138: 41 30 30 85 90 FF FF FF A00.....
002140: FF FF FF FF FF FF FF FF ........
002148: FF FF FF FF FF FF FF FF ........
002150: FF FF FF FF EA FF FF FF ........
002158: FF

at memory address 2130, D0, is a CRC (8-bit, x^8+x^5+x^4+1 polynomial)
of address locations 2110 - 212F that was calculated by the DS2501 as
the data was read in by the bus master.
I was unable to get any useful data after 213C but then it read a byte
at location 2155. The cause of this is unknown and there was no valid
CRC calculated...this is still under investigation.
As far as the memory dump....Dell (manu.), 00 I'm guessing is an
identifier, AC describing what type of adapter, 0 another identifier,
195046 being 19.5 volts and 4.6 amps. From CN to 62 this is the
product identification number found on the barcode and A00 is the
revision code 00 being the important part b/c I obtained a second 90
watt power supply and it too and an 'A' appended before the numerical
portion of the revision number.

Hope anyone reading this finds the information useful.

(Same as before insert disclaimer here....)