Add seti and int operators

design.md

@@ -61,6 +61,8 @@ All symbols are reserved keywords and can therefore NOT be used as labels.
 - `muli` multiply the first by the second argument and store the result in the third argument
 - `shli` shift left the first argument by the number of positions given by the second argument and store the result in the third argument
 - `shri` shift right the first argument by the number of positions given by the second argument and store the result in the third argument
+- `seti` set the first register argument to the second argument
+- `int` calls the interrupt specified by the first (integer) argument
 
 ### Control Flow
 
@@ -68,3 +70,9 @@ All symbols are reserved keywords and can therefore NOT be used as labels.
 - `lti` execute next statement if argument 1 is less than argument 2 else skip the next statement
 - `gti` execute next statement if argument 1 is greater than argument 2 else skip the next statement
 - `eqi` execute the next statement if argument 1 is equal to argument 2 else skip the next statement
+
+## Interupts
+
+- 0..9 range:
+	- `0` put value of register A as ASCII character on stdout
+	- `1` put value of register A as decimal integer on stdout