Date: Sun, 02 Nov 1997 11:18:06 -0500 From: Jerry Hicks <wghhicks@ix.netcom.com> To: hackers@FreeBSD.ORG Subject: Re: 7400 gates effected by probe routine Message-ID: <345CA7BE.B8E3E25B@ix.netcom.com> References: <Pine.BSF.3.96.971101231708.2591B-100000@trojanhorse.ml.org> <345C87C9.15FB7483@est.is>
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Þorður Ivarsson wrote: > > I am not sure at the moment but I have been working with Rocwell 6522 > PIA and > I think it should be possible to probe 8255 in same manner as 6522, send > byte to > output ports and read back, if they are defined as output you should get > the > same back out from them. I think you can also with the control register. > > Do you have the 8255 datasheet ? it is available from Intel website > > -- > Þórður Ívarsson Thordur Ivarsson > Rafeindavirki Electronic technician > Norðurgötu 30 Nordurgotu 30 > Box 309 Box 309 > 602 Akureyri 602 Akureyri > Ísland Iceland > > --------------------------------------------- > FreeBSD has good features, > Some others are full of unwanted features! > --------------------------------------------- FWIR, you can't read the outputs back from a simple buffered 8255. We designed a board once with a registered PAL to front-end the 8255 for that function. Good Luck, Jerry Hicks jerry_hicks@bigfoot.com
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