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Decoding the Event Code from Biosemi in EEGLAB

Decoding the Event Code from Biosemi in EEGLAB

This knowledge benefits from a discussion in EEGLAB users forum.  Biosemi machine expects two sets of 8 pin event.  If you use only one set in the case of parallel port, the first 8 bits are all set to 1, so it equals to 65280 in terms of decimal number.

Pin #	Binary code	Decimal code	Extended binary code	EEGLAB shows
None	0000 0000	0	1111 1111 0000 0000	65280
2	0000 0001	1	1111 1111 0000 0001	65281
3	0000 0010	2	1111 1111 0000 0010	65282
4	0000 0100	4	1111 1111 0000 0100	65284
5	0000 1000	8	1111 1111 0000 1000	65288
6	0001 0000	16	1111 1111 0001 0000	65296
7	0010 0000	32	1111 1111 0010 0000	65312
8	0100 0000	64	1111 1111 0100 0000	65344
9	1000 0000	128	1111 1111 1000 0000	65408

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