For this line...
A0800AMT3B
A: Athlon Core 800MHz
0800: 800MHz
A: PGA package
P: 1.3V voltage (or 1.4, I don't remember Duron's voltage)
T: Max operational temperature is 90°C
3: 192KB of cache memory
B: 200MHz FSB
The rest is serial numbers (Well, I suppose)
ADFA0039GPLW
93039370028
1999 AMD
Please someone correct me if I'm wrong, but if I remember clearly, it should be that!