hiroji 's Duron 900 (@600)
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Update August 6, 2000
I was pointed out an error about VID from Mr. Alexander Patus and his Father (Slovakia/Europe). I confirmed the error of the connection VID0 and setting of VID. I corrected it. Thanks Alex.

Hello, I am hiroji.
I modified MB (FIC AZ11) and succeeded in the multiple change of Duron. CPU was not modifying it at all.

FID 0 1 2 3
SocketA
pin Assign		 W1 W3 Y1 Y3
BP_FID 0 1 2 3
SocketA
pin Assign		 AN27 AL27 AN25 AL25
VID 0 1 2 3 4
SocketA
pin Assign		 L1 L3 L5 L7 J7
D600AST1B-AKAA0022CPBW-91695360643
Update 7/19

FID and VID
Cut the circuit pattern between SocketA and MB. Switch (GND or OFF) is connected to the circuit pattern on the side of MB.

BP_FID
The circuit pattern of "OVERRIDE" is connecting to BP_FID in FIC AZ11.
And, set jumper switch (2.0V or GND) here.

Circuit Diagram


Modification of MB is completion.
The setting is as AMD's datasheet. Incidentally I confirmed action with the following setting.

600:FID(0,1,2,3),BP_FID(0,1,2,3)=(GND,OFF,OFF,GND),(GND,2.0V,2.0V,GND)
650:FID(0,1,2,3),BP_FID(0,1,2,3)=(OFF,OFF,OFF,GND),(2.0V,2.0V,2.0V,GND)
700:FID(0,1,2,3),BP_FID(0,1,2,3)=(GND,GND,GND,OFF),(GND,GND,GND,2.0V)
750:FID(0,1,2,3),BP_FID(0,1,2,3)=(OFF,GND,GND,OFF),(2.0V,GND,GND,2.0V)
800:FID(0,1,2,3),BP_FID(0,1,2,3)=(GND,OFF,GND,OFF),(GND,2.0V,GND,2.0V)
850:FID(0,1,2,3),BP_FID(0,1,2,3)=(OFF,OFF,GND,OFF),(2.0V,2.0V,GND,2.0V)
900:FID(0,1,2,3),BP_FID(0,1,2,3)=(GND,GND,OFF,OFF),(GND,GND,2.0V,2.0V)

1.50V:VID(0,1,2,3,4)=(GND,OFF,OFF,OFF,GND)
1.60V:VID(0,1,2,3,4)=(GND,OFF,GND,OFF,GND)
1.70V:VID(0,1,2,3,4)=(GND,OFF,OFF,GND,GND)
1.80V:VID(0,1,2,3,4)=(GND,OFF,GND,GND,GND)
1.85V:VID(0,1,2,3,4)=(GND,GND,GND,GND,GND)
Corrected August 6, 2000

My Duron600 is during a stable action with 900MHZ@1.85V. It did the encoding from AVI to MPEG1 with continuation for 14 hours.








Operation condition

Because it is test environment MB is being fixed in plywood board.

MB, CPU and SDRAM
It is seen 2 switches in the right edge of MB.

4bit switch = FID
8bit switch = VID (5bit use)

Reverse side view

Reverse side close-up
Expansion foundation

All GND-line are connecting to GND of "OVERRIDE".
(Green electric wire)

Cut the circuit pattern

Reverse side of sockerA. It is the left side.
I used a knife

Switch and FID
Jumper switch be seen to the back. It is BP_FID (OVERRIDE)

Cnnecting point of FID is left side of 4bit switch. And details are the following figure.

VID0,1,2,3 cnnecting point

Details are the following figure. I confirmed pattern with a tester.
It is indistinct whether this point is really correct.

Corrected VID0 August 6, 2000

VID 4 cnnecting point

It is indistinct whether this point is really correct.

hiroji (2000/7/13) email = hiroji@mui.biglobe.ne.jp

Editing by XLV750R "RISE! RISE! RISE!"

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