Here is another excellent example of an early Second Optical Inspection Station representative of the pre-automation era.
Nevertheless, this machine was advanced for its day and could be operated quite efficiently. An operator could likely inspect upwards of 400 units per hour with ease, which is about the upper limit of a person’s speed without auto-assistance. The system does have a joy stick in the form of an O ring that the operator could position much the same as done on a modern day laptop pointer pad.
The unit was labor efficient with nothing but a simple accept/reject decision required on the part of the operator. If a reject occurred the operator simply pressed a footswitch and the die was red-inked. While efficient of time it disallowed rework without further inspection. Such units were typical of the period when chip costs were small compared with package costs. Under these circumstances the chip throwaway cost was negligible relative to the cost to be absorbed should a defective, but undetected, die be sealed into an otherwise good package.
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