+;------------------------ Virtual I2C interface --------------------------
+;05 5 out - Control Port: 1 = Start read operation
+; 2 = Start write operation
+;05 5 in - Status of last Transfer: 0 = ok, else fail
+;06 6 in/out - Number of bytes to transfer, including Slave address
+;07,08 7,8 in/out - Read/Write address low/high
+;
+;------------------------ Disk I/O ---------------------------------------