Added direct memory access

README.md

@@ -14,6 +14,7 @@
 - `;` for end of statement (mandatory)
 - `[label]:` for labels
 - `#[text]` for comments: any text is ignored till a newline (`\n`) is found
+- `[[%register|$value]]` for accessing memory
 - Elements must be separated by whitespace character
 	- Good: `add $2 $5 %A;`
 	- Bad: `add $2$5%A;`
@@ -34,6 +35,12 @@ lti %B $10;
 jmp loop;
 ```
 
+Read the integer at memory location `1024` into register A:
+```
+seti %A [$1024];
+```
+Remember not to use spaces inside the `[` brackets.
+
 ## Reserved symbols
 
 The following whitespace characters are used to separate symbols:
@@ -82,6 +89,8 @@ All symbols are reserved keywords and can therefore NOT be used as labels.
 
 ## Interupts
 
-- 0..9 range:
+- [0..9] Output to STDOUT
 	- `0` put value of register A as ASCII character on stdout
-	- `1` put value of register A as decimal integer on stdout
+	- `1` put value of register A as decimal integer on stdout
+	- `2` put value of register A as hexadecimal integer on stdout
+	- `3` put the string pointed at by register A for the amount of characters defined by register B on stdout