Source.
The data sheet says:
[quote:e3183e87ac]
The Port A output buffers have symmetrical drive characteristics with both high sinkand source capability.[/quote:e3183e87ac]
The 1284P data sheet says that each pin is capable of sourcing 20mA with Vcc = 3v, but interestingly, does not quote a figure for vcc=5v. I'd assume at least 20, if not more.
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