Info needed on some 1980s-era Intel parts

Go over to http://www.hpmuseum.net/ . Follow the 'documentation' link then search for 59405 (that's the model number of the interface). IIRC, there are 2 documantes for that, one is a set of unofficial hand-drawn schematics, the other is the operating/service manual, inclduing an official schematic. It's an odd design. Basically, it can transfer bytes between the HP9830's I/O bus and the HPIB, with the ATN line held active if you want it. There is no direct way to set talker or listenr status of the interface, instead. it detects Talk Address and Listen Address commands on the bus. To make the interface a talker, it can send a byte with ATN active which happens to be a Talk Address command with the right address. The interface hardware recognises that and sets talk mode. -tony