Eye and ISI: PRBS7 through one RC pole, and when the eye shuts

Set the bit time and the channel's time constant. Watch the eye close as bits get shorter, and how much a de-emphasis tap opens it.

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Where the numbers come from

gHashTag/t27 specs/fpga/eye_isi.t27 (t27#8931): every value on the page is its fn bodies, compiled to wasm (logic.js), with 7 tests
H. Johnson, M. Graham, High-Speed Signal Propagation, 2003, ch. 3 and ch. 13: intersymbol interference in a first-order channel
ITU-T O.150: PRBS7, polynomial x^7 + x^6 + 1, period 127