The Washburn KC10 was the only single pickup model in the Chicago Series. Made in 1989 only it featured a single angled humbucker in the bridge position. It was also the only KC series guitar with a maple fingerboard.

Source: Washburn catalog 1989.

The Washburn KC100 was the top of the range Chicago Series model in 1989. This Japanese made super-strat had carved top and back, solid flamed maple body, set maple neck, ebony fingerboard Seymour Duncan HSS pickups and Floyd Rose Licensed Tremolo.  It had relatively complex active circuitry, with three knobs and three micro switches. The KC100 did not have the deeply scalloped cutaways seen on the other KC Series models,

Source Washburn catalog 1989

The Washburn KC20 was the entry level Chicago series superstrat. It came with HSS Washburn pickups and a vintage style vibrato bridge. The KC20 was availalble with rain-effect finishes including pacific blue rain, red rain and purple rain.

Source: Washburn catalog 1990.

The Washburn KC40 was made from 1989 to 1992, The KC40 was a Chicago Series superstrat and had an ultra thin bolt-on maple neck. The neck joint was angled back and the body had deeply scalloped cutaways - both these features were designed to improve access to the upper frets. The KC40 had a 22 jumbo fret rosewood fingerboard with pearl dot inlays, six-on-one-side tuners, Floyd Rose 600S Pro tremolo with locking nut, one exposed humbucker and two single coil Washburn pickups (HSS) controlled by two knobs (1 volume, 1 tone), five-way switch, chrome hardware.

The Washburn KC42 was the reverse headstock version of the KC40. It came in black finish, woodstone flourescent yellow or woodstone flourescent red

The Washburn KC44 was a Chicago Series superstrat electric guitar, similar to the KC40 but with HSH pickup configuration and 22 frets. The KC44 had an alder body with an arched top and back (a little like the Ibanez S-Series) with deeply scalloped cutaways. It came with a Washburn 600S Pro Floyd Rose tremolo. It came with a speckled rain finish in black or white or a natural finish.

Source: Washburn catalog 1990

The Washburn KC45 was made in 1989 only and was just like the KC40 except with a wrap-around bridge and without a locking nut.

The Washburn KC60 was made in 1989 only. The KC60 was a Chicago Series superstrat and had an ultra thin bolt-on maple neck. The neck joint was angled back and the solid alder body had deeply scalloped cutaways - both these features were designed to improve access to the upper frets. The KC60 had a 22 jumbo fret rosewood fingerboard with pearl dot inlays, six-on-one-side tuners, Deluxe Floyd Rose Licensed tremolo with locking nut, one humbucker at the bridge and one angled single coil pickups (Washburn Eliminators) controlled by two knobs (1 volume, 1 tone).

The Washburn KC70 was made from 1989 to 1991. It was a Chicago Series superstrat with an alder body, deep scalloped cutaways and angled bolt-on neck heel. The body had an arch to the top and back. The thin bolt-on maple neck had a 22 fret rosewood fingerboard with pearl dot position markers. Hardware was black including, six-on-one-side tuners, Floyd Rose 600S tremolo and locking nut. The pickups were Washburn Eliminators - one humbucker and two single coils (HSS).

The Washburn KC90 was one of the flagship models of the KC Series - replacing the set-neck KC100 in 1990 at the top of the Chicago Series. This Japanese made super-strat had carved top and back, deeply scalloped cutaways, solid ash body, natural finish maple neck, Seymour Duncan HSS pickups and Washburn 600S Pro Floyd Rose Tremolo. Finish options included black and natural gold.

Source Washburn catalog 1990.