[Device registers] device register in external address space [Interrupts] no interrupts [RCX device controlled] 
output ports
b u t t o n s
i n p u t p o r t s
b a t t e r y v o l t a g e l e v e l
t i m e r s
i n f r a r e d t r a n s m i t t e r / r e c e i v e r
L C D
s p e a k e r
o u t p u t p o r t s