Patent ID: 7761021

Claim:
A printer control method for controlling, by means of a computer equipped with a display screen, a printer having a plurality of feed ports for feeding a printing medium, the method comprising the steps of: (a) displaying on the display screen: a feed port specifying portion for a user to specify at least one of the feed ports from the plurality of feed ports; a first size display portion for displaying a list of available printing medium sizes; and a first size specifying portion for the user to specify a printing medium size to be printed, on the basis of the list of available printing medium sizes displayed on the first size display portion; (b) from pre-registered user-defined printing medium sizes which are non-standard paper sizes, identifying user-defined printing medium sizes included within a printing medium size permissible range dependent upon the feed port specified through the feed port specifying portion; (c) controlling the printer so as to carry out printing of the printing medium size specified through the first size specifying portion; (d) before performing step (c), displaying on the display screen: a second size display portion for displaying a list of available printing medium sizes of a printing medium loadable in a particular feed port; and a second size specifying portion for the user to specify the printing medium size of a printing medium to be loaded in the particular feed port, on the basis of the list of available printing medium sizes displayed on the second size display portion; (e) before performing step (c), from pre-registered user-defined printing medium sizes, identifying user-defined printing medium sizes that are included within a printing medium size permissible range dependent upon the particular feed port; and (f) when two or more of the feed ports including the particular feed port have been specified through the feed port specifying portion, determining whether the printing medium size specified through the second size specifying portion matches the printing medium size specified through the first size specifying portion; and if the printing medium size specified through the second size specifying portion matches the printing medium size specified through the first size specifying portion, controlling the printer so as to feed the printing medium from the particular feed port; wherein: in step (d), the user-defined printing medium sizes identified in step (e) are displayed in the list of available printing medium sizes displayed on the second size display portion; and in step (a), user-defined printing medium sizes are only displayed on the first size display portion if identified in step (b).