Czerweny CZ Spectrum Plus Brand: Czerweny Electrónica S.A.I.C. Model: CZ Spectrum PlusMade in: Argentina (Paraná, Entre Ríos) First year of production: 1986 The CZ Spectrum Plus has two built-in joystick ports, hardwired to the keyboard. They are compatible with ZX Interface 2 (67890 / 12345).