SST

[Steve Gehlbach]

>>SST 39SF020A (70-4C-NH)
>>

Although it is not an equivalent part, I use the Atmel AT49F002T in 
place of the SST39SF020A and it works fine on the epia-800.  I program 
it with a Needhams programmer, though, not sure if you can program it on 
the mobo.  You for sure need Atmel programming software, it is different 
from SST.  The advantage is that this part is available from DigiKey.

-Steve