This application note details an expandable I/O and memory expansion
framework centered around the Atmel AT89LP2052.  The text for "Two-Wire 
Peripheral Expansion for the AT89LP2052" can be found on the Atmel Web 
site www.atmel.com

The following files pertain to the application note:

EXPDCNTL.ASM       "Pseudo"-80C51 assembly source code
EXPDCTL1.C         C source code
EXPDCTL2.C         C source code