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In 1978, [[American Microsystems]] (AMI) released the S2811.<ref name="computerhistory1979"/><ref name="edn"/> The AMI S2811 "signal processing peripheral", like many later DSPs, has a hardware multiplier that enables it to do [[multiply–accumulate operation]] in a single instruction.<ref>Alberto Luis Andres. [http://scholarworks.csun.edu/bitstream/handle/10211.3/126902/AndresAlberto1983.pdf "Digital Graphic Audio Equalizer"]. p. 48.</ref> The S2281 was the first [[integrated circuit]] chip specifically designed as a DSP, and fabricated using vertical metal oxide semiconductor ([[VMOS]], V-groove MOS), a technology that had previously not been mass-produced.<ref name="edn"/> It was designed as a microprocessor peripheral, for the [[Motorola 6800]],<ref name="computerhistory1979"/> and it had to be initialized by the host. The S2811 was not successful in the market.
In 1979, [[Intel]] released the [[Intel 2920|2920]] as an "analog signal processor".<ref>{{Cite web |url=https://www.intel.com/Assets/PDF/General/35yrs.pdf#page=17 |title=Archived copy |access-date=2019-02-17 |archive-date=2020-09-29 |archive-url=https://web.archive.org/web/20200929045706/https://www.intel.com/Assets/PDF/General/35yrs.pdf#page=17 |url-status=dead}}</ref> It had an on-chip ADC/DAC with an internal signal processor, but it didn't have a hardware multiplier and was not successful in the market.
In 1980, the first stand-alone, complete DSPs – [[Nippon Electric Corporation]]'s [[NEC µPD7720]] based on the modified Harvard architecture<ref>{{cite web |url=https://www.datasheetarchive.com/datasheet?id=03a93172fcfb5d333133fa8d7fb1d6fa7cf492&type=M&term=upd7720 |title=NEC Electronics Inc. μPD77C20A, 7720A, 77P20 Digital Signal Processors |page=1 |accessdate=2023-11-13}}</ref> and [[AT&T Corporation|AT&T]]'s [[AT&T DSP1|DSP1]] – were presented at the [[International Solid-State Circuits Conference]] '80. Both processors were inspired by the research in [[public switched telephone network]] (PSTN) [[telecommunication]]s. The µPD7720, introduced for [[voiceband]] applications, was one of the most commercially successful early DSPs.<ref name="computerhistory1979"/>
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