This attribute is the pin number (i.e. like GND is 7 on
74 TTL). All pins must have a pinnumber=# attribute attached
to the pin object.
You can have numbers or letters for the value. This attribute should be visible with the value only visible. You also need a pinseq attribute (pinseq attribute).
Examples:
pinnumber=1 pinnumber=13 pinnumber=A0
This attribute replaces the obsolete pin#=# attribute.