Advertisement for Electronic Arrays calculator integrated circuits, from March 1971, which are those used in the Walther ETR3.
Electronic Arrays produced a standard six-chip set for calculators that could be customised by adding other chips, or substituting one or more of the chips, to give extra functions. Using only six chips would offer "reduced labor costs because of the reduced assembly time. This will open up the calculator market to companies that otherwise wouldn't get into it"[1].
The quantity price of the chip set in July 1970 was $60 to $70, but was expected to halve within a couple of years.
The kit consists of an input unit; a control read-only memory; a control logic device, a register, an arithmetic unit; and an output chip, all in 24-pin packages to keep the cost down.
There is further information about the development of the Electronic Arrays chip-set at http://www.oldcalculatormuseum.com/icm816.html.
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