2 layers379 × 165.1 mm

HexPerTerminal
ForgottenMachines/Entrex
The technologies documented here will include all like-kind systems manufactured by Nixdorf, Redifon, ROCC & Mera, all originally designed by Entrex Inc, Burlington, MA USA.
90 parts1
Boards in 1 GitHub repository, designed in KiCad, that use the SN7404D by Texas Instruments (0℃~+70℃ 12mA 16mA 22ns@5V,15pF 2V 4.75V~5.25V 400uA 6 7400 800mV SOIC-14 Inverters ROHS). See how each wires it, with its parts, size, README and files; the SN7404D’s symbol, footprint and pinout are on its own page.

ForgottenMachines/Entrex
The technologies documented here will include all like-kind systems manufactured by Nixdorf, Redifon, ROCC & Mera, all originally designed by Entrex Inc, Burlington, MA USA.