On Thu, 14 Sep 1995 13:33:32 +0100, Simon Cooke said: > ;entered with data to print in E
Whatever. :-) > Can someone check if I've got the busy bit polarity right? :) As far as I remember: bit 0 = 0 --not busy bit 0 = 1 --busy. You may have the strobe the wrong way round. Outputting zero makes the strobe high (i.e inactive). I know this because my old printer didn't work when we first tried it, and it turned out that the reason was because the Sam initially sets strobe active (naughty!) and the printer therefore pretended to be always busy. Typing OUT 233,0 when the Sam was first switched on solved the problem. Also, note that the EDDAC sets the busy signal to 'not busy', so you can tell if one is connected by setting the data register to 0 (or something harmless) and wiggling the strobe. A real printer will become busy, but the EDDAC will not. I can't remember whether you can tell that the interface is connected in the first place, but I think probably not. imc
