=> R0 = Bits 0..3 address of 16 Bit word
Bit 10 set for write, clear for read
R1 = Bits 0..15 write data (if R0 Bit 10 set)
<= R0 = data read if R0 Bit 10 was set on entry
R0 = preserved if R0 Bit 10 was clear on entry
Reads/writes EEPROM on the host, where available.
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