X86-Secret : ES Zone
K7 Argon A0 ES  (July 1998)   
This very early A0 sample is one of the 10 firsts K7 ever produced after initial Tape Out (which occurred in July 1998). It features the Argon core (0.25 ┬Ám) and was never soldered into a PCB because of errata in the metalization layer. AMD package code for this sample is 26100, while later ES use 26650. An additional 6 pad debug connection (not present on later samples) can be seen on the left.