WM-EX90

The WM-EX90 is a slim-bodied playback Walkman that stood out within the early EX line for framing portable cassette listening as something more deliberate and controlled instead of purely casual. Alongside auto-reverse, Dolby B, Extended Dynamic Bass Boost, and an EX Amorphous head, it introduced an A-B section repeat function built for language study, dictation, or close repeated listening. Its full-function LCD remote displayed counter, status, clock, and battery information, while an external battery sidecar allowed extended operation through two AA cells.

This is part of the more revealing models of the year because it shows Sony imagining the Walkman as something other than just a music companion. The EX90 was clearly aimed at users who wanted repetition, precision, and a little more command over what the tape was doing, whether for study or careful listening. It is less of a lifestyle machine and closer to a portable tool that still happened to look elegant.