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Brainfuck, 184 bytes
Input/output uses U+0000 and U+0001.
0000 .
0001 ,[,[->+<]]>.
0010 ,[,-[+>+<]]>.
0011 ,.
0100 ,-[,[->+<]]>.
0101 ,,.
0110 ,>,[-<-[+>+<]>[-<+>]]<.
0111 ,-[,-[+>-<]]>+.
1000 ,-[,-[+>+<]]>.
1001 ,>,-[+<-[+>+<]>[-<+>]]<.
1010 ,,-[+>+<]>.
1011 ,-[,[->-<]]>+.
1100 ,-[+>+<]>.
1101...