If you are interested in looking back at reviews of keyboards and hi-tech recording equipment from the '80s and early '90s, then the link below is a good resource site for a lot of the UK review magazines of that time. It's an on-going project, and is reliant on people supplying old hard copies of the magazines or else OCR scanning then and sending that info in. But there's already quite a collection.
It was started by a regular Sound on Sound forum member, as the SoS on-line archives only go back to 1993, but has expanded to cover most of the hi-tech equipment mags of that time.
http://www.muzines.co.uk/