The Red-Doped Wafer is used in crafting devices for signal transmission purposes. They allow higher density integrated circuits to be fabricated.
Filter
Item Detector
Sorting Machine
Regulator
8K RAM Module
Assembler
Bus Transceiver
Central Processing Unit
Disk Drive (RedPower)
Monitor (RedPower)
Relay
Silicon Chip
IO Expander
http://nemesis.evalq.net/RedPower2/recipes.html