Abstract: A registration alignment system to be used with a printed circuit board drilling machine for registration of PCBs on the tooling plate for drilling and other operations. The registration alignment system includes a registration bar and a registration block that move independently of each other. The movement of the registration bar is constrained to one dimension (i.e., X-axis), and the movement of the registration block is constrained to one dimension (i.e., Y-axis) that is perpendicular to the axis of movement of the registration bar. The registration bar and block contact adjusting screws which are used to control precise movement of the registration bar and block. When the registration pins of the PCB are in position against the registration bar and block, the pins are held in place by clamping bars. When the size of the registration pins change, the registration of the new PCB is still correct and does not have to be adjusted.

Abstract: An automatic registration system to be used with a drilling machine that automatic loads PCBs by pushing PCBs from a cart or similar carrier onto the tooling plate for drilling and other operations. The automatic registration system includes at least a tooling plate having an angled slot, a main slot, a registration block, and a pin clamp. The angled slot allows the first registration pin of the PCB to bypass the registration block without requiring the registration block to move out of the way. The pin clamp slides across the angled slot thereby clamping the second registration pin of the PCB against the registration block. The PCB is then registered to the drilling machine and drilling or other operations can take place.

Abstract: An arbiter with first and second CPU timers is provided which advantageously allows measuring and controlling CPU bus ownership intervals via the arbiter. The first CPU timer, a running timer, specifies the total interval that the CPU is allocated the bus. The second time, an idle timer, specifies an interval which the CPU may own the bus without performing an operation. The arbiter uses these two timers to dynamically adjust and control CPU bus ownership.