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Notes and Reflections on Books and Media

by Hannah Leitheiser

USB Complete: The Developer's Guide, 4th Edition

Jan Axelson

2009

Link

2020-01-19

"In contrast, some older interfaces can connect to very simple circuits that soft-ware addresses directly. For example, the PC’s original parallel printer port is aseries of digital inputs and outputs. You can connect to input and output cir-cuits such as relays, switches, and analog-to-digital converters with no com-puter intelligence required on the device side. With a driver to enable portaccess, applications can monitor and control the individual bits on the ports." - Jan Axelson, USB Complete: The Developer's Guide, 4th Edition (2009)