From: utzoo!watmath!csc Newsgroups: net.micro Title: 8255 info request Article-I.D.: watmath.4340 Posted: Thu Jan 13 17:16:00 1983 Received: Fri Jan 14 00:03:10 1983 Help! I am trying to get one 8255 to talk to another, in mode 1. The sender should receive an interrupt after the receiver has read his data, and the receiver should receive an interrupt from its 8255 indicating data is ready to be read. The current plan looks like this: (*OBF == negative true Output Buffer Full *ACK == negative true ACKnowledge *STB == negative true STroBe IBF == Input Buffer Full) 8255 in mode 1 sending data 8255 in mode 1 receiving | | *OBF(b) |--------------------------------->| *STB(a) | | | | *ACK(b) |<----------