English: Circuit board of a Hewlett-Packard 82940A GPIO Interface for Series 80 desktop computers (1980s). The rightmost integrated circuit is the proprietary bus interface chip, to its left an Intel 8049 microcontroller can be seen.
The Interface's internal address ("select code") can be set using the DIP switches.
Deutsch: Hewlett-Packard 82940A GPIO Interface für Tischrechner der Serie 80 (geöffnet).
Der HP-eigene integrierte Schaltkreis ganz rechts verbindet den Intel 8049 Mikrocontroller (links daneben) mit dem Bus des Rechners.
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{{Information |Description={{en|1=ircuit board of a Hewlett-Packard 82940A GPIO Interface for Series 80 desktop computers (1980s). The rightmost integrated circuit is the proprietary bus interface chip, to its left an Intel 8049 microcontroller can be se