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ECP
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Answers and insight into some of the common questions and misunderstandings regarding the 1284 parallel port standard and its usage.
http://www.fapo.com/1284faq.htm
The Extended Capability Port, or ECP, protocol was proposed by Hewlett Packard and Microsoft as an advanced mode for communication with printer and scanner type peripherals.
http://www.fapo.com/ecpmode.htm
Describes interfacing the ECP complete with register details and waveforms.
http://www.beyondlogic.org/ecp/ecp.htm
Proposed ECP Interface to replace the memory board of the Mark IV.
http://www.tass-survey.org/tass/technotes/tn0078.html
Parallel interface information from Usbyte.com.
http://www.usbyte.com/common/Parallel_Interface.htm