The Apple-1 did not have a interface "on board" to store or read programs. At the moment the computer had been developed, Steve Wozniak
of course was aware of that problem - so he integrated the slot at the edgeconnector with the most signals of the Apple-1 looped up to the slot.
This gave him the freedom to first complete the design of the computer itself and push the development of the "storage facility" ahead to a later
point in the timeline. While then testing the basic functions of the Apple-1 prototype he then searched for a cheap and simple ability to store
and read programs and then designed the Apple-1 cassette interface. This gave the user a cheap and common ability to handle the storage. You
should remember that the common storage units of those days on disk or at cards have been extreme expensive and due to the fact that Wozniak
and Jobs targeted in the general to sell their computer to students - so they of course did hunt for a cheaper solution to problem of that days. At
the other hand cassette tape recorders and tapes had already become very common in that days and had been availiable at an affordable price.
The Operation manual of the ACI is rather simple
and short. It consisted of only 2 sheets of folded paper and
wrapped down to half letter size.
Please also recognize the red marked area in page 4 !
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