Article View: comp.sys.intel
Article #1848Question for 8255 Guru
From: Cris Simpson
Date: Mon, 30 Jan 1989 00:55
Date: Mon, 30 Jan 1989 00:55
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879 bytes
I am having trouble figuring out the INTR abilities of the 8255A. I understand that the 8255A signals the x86 on the INTR line, then the x86 asserts INTA, and then reads the 'vector type' from the data bus. The question: How does the 8255A set up the byte representing this 'vector type'? Yes, I have RTFDataSheet. No, please don't post responses, I'll summarize if anyone cares. Thanks, cris
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!gatech!gitpyr!is813cs From: is813cs@pyr.gatech.EDU (Cris Simpson) Newsgroups: comp.sys.intel,comp.arch,comp.sys.ibm.pc Subject: Question for 8255 Guru Message-ID: <7184@pyr.gatech.EDU> Date: 30 Jan 89 00:55:41 GMT Reply-To: is813cs@pyr.gatech.edu.UUCP (Cris Simpson) Followup-To: comp.sys.intel Distribution: usa Organization: VA Rehab R&D | Ga Inst of Technology Lines: 12