1. A method of patching a mainframe operating system controlling a mainframe computer, the method comprising: obtaining an address range in memory for a nucleus-resident routine; unlocking one or more pages of memory in the obtained address range; searching the obtained address range for pointers to SCHEDULE service code that creates service request blocks (SRBs); updating the pointers to the SCHEDULE service code in the nucleus-resident routine to point to an intercept routine, wherein the intercept routine includes an interface to an IEAMSCHD service and includes code that directs invocations of the SCHEDULE service to the IEAMSCHD service; and updating a supervisor vector table (SVT) with pointers to the intercept routine, wherein the intercept routine enables an application program calling the SCHEDULE service to execute on one or more otherwise prohibited financially cost effective processors.