Here's one a bit earlier: Jan 31, 1989, for a CompuAdd 286 machine with on-board IDE interface:
https://books.google.com/books?id=pMnJ2MkrjNgC&pg=PA161&dq=Built-in+IDE+interface&hl=en&sa=X&ved=0ahUKEwiYnpG0yNPWAhVSy2MKHXdMA4kQ6AEIXTAI#v=onepage&q=Built-in%20IDE%20interface&f=true Which means that the ad copy was probably developed during 1988. I'm trying to determine the date of the first IDE card. It'd have to be much earlier than the CompuAdd board, as I remember the initial ones only had a single cable for 2 drives--no secondary interface. --Chuck
