Stepping 2 is the third number in the CPUID, which consists of Family-Model-Stepping.
There are 3 desktop versions of the Athlon XP 1800+, as follows:
XP 1800+ T-bred B (L2 256KB) 11.5x133MHz = 1533MHz, WCPUID = 6-8-1
XP 1800+ T-bred A (L2 256KB) 11.5x133MHz = 1533MHz, WCPUID = 6-8-0
XP 1800+ Palomino (L2 256KB) 11.5x133MHz = 1533MHz, WCPUID = 6-6-2
The only one with a stepping of 2 is the earliest model, the Palomino. Yours is also a Palomino by appearance, having a square core with identification printed on it, as opposed to the 2 Thoroughbreds with their oblong cores, and the markings on separate labels. Here is a good page for visual comparison (the different colors do not mean much, by the way):http://www.thedigerati.us/info/amdcpuchart.html#xp
Your 1800+ Palomino uses 133FSB and should work in any Socket A mobo in current or recent production.
My ECS/PCCHIPS/Amptron PCs