Power-On Hours and Cycles
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15
A technique for obtaining, recording and updating the total number of power-on hours for specified processor components provides a means for accurately tracking components usage. The technique is described in the following. The tracking of power-on hours (POH) is initiated by any power state change of the 4381 processor connected to a power stall, regardless of the machine or Link Test System (LTS) mode of operation. When the machine power state changes, one of the power state light-emitting diodes (LEDs) on the operator control panel (OCP) must also follow and change its on/off condition. This change in the LEDs is monitored in the LTS through the UTS microcode. Any change in the power LEDs sets a hardware interrupt in the UTS/LTS, and the UTS/Operating System (UTS/OS) handles this interrupt.