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=== 3278/79 Host Connect / Emulation Adapter === * '''BNC twinax''' connection to the IBM '''3174''' or '''3274''' cluster controller. * Two variants exist: :: Older โ 4 KB buffer, I/O at '''2D0hโ2D6h'''. :: Newer โ adds register at '''2D7h'''; reconfigurable buffer size. * Technical reference: '''IBM 1502336''' โ ''PC 3278/79 Emulation Adapter Technical Reference'' (October 1983).<ref>http://bitsavers.trailing-edge.com/pdf/ibm/pc/cards/1502336_PC_3278_79_Emulation_Adapter_Technical_Adapter_Oct83.pdf</ref> [[File:IBM 5271 physical layout.svg|center|thumb|480px|IBM 5271 (3270 PC) physical layout diagram showing slot placement for the keyboard adapter, display adapter, host-connect card, and the optional APA / PSS expansion cards. (Image: Wikimedia Commons, public domain)]]
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