|'''I/O'''||'''Decoded as'''||'''Port'''||'''Read'''||'''Write'''
|-
|#7CXX||%0xxxxx00 xxxxxxxx||Aleste RAM Mapper page 0(extended "Gate Array 3")||Read||Write
|-
|#7DXX||%0xxxxx01 xxxxxxxx||Aleste RAM Mapper page 1(extended "Gate Array 3")||Read||Write
|-
|#7EXX||%0xxxxx10 xxxxxxxx||Aleste RAM Mapper page 2(extended "Gate Array 3")||Read||Write
|-
|#7FXX||%0xxxxx11 xxxxxxxx||Aleste RAM Mapper page 3(extended "Gate Array 3")||Read||Write
|-
|#7FXX||%0xxxxxxx xxxxxxxx||Aleste Multiport (customized [[Gate Array]])||-||Write