: Outputs a value (range of 0-255) to a specific I/O address.
: Watch out [http://cpcwiki.eu/index.php/I/O Port Summary]O_Port_Summary
==== <code>PAPER[#‹stream expression›][,]</code> ====
: Returns a value read from the defined I/O address
: Watch out [http://cpcwiki.eu/index.php/I/O Port Summary]O_Port_Summary
: Example
:Does AMSDOS has already given out a failure then Bit 7 will be set. That means add 128 decimal to DERR code.
* '''Unknown error''' - Executing <code>ERROR</code> command with any other legal error code number (up to 255).
== Other Basic Dialects available for the CPC ==