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DSW1
From SnesLab
DSW1 is an acronym that appears twice on page 1-2-28 of official Super Nintendo development manual, presumably standing for "Dip Switch 1," evidenced by the fact that the mentioned PCB, SHVC-8PV5B-01, does have an 8-bit dip switch next to the battery.
References
- image of SHVC-8PV5B-01: https://snescentral.com/pcbboards.php?chip=SHVC-8PV5B-01
External Links
- example of DSW1 standing for dip switch in the wild: http://www.graphtec-ss.jp/Neuron-USA/Software/DownloadFiles/SCR9FProtocol.pdf