1991, when the computer was discontinued, as the 8-bit computer market in Spain was dead in favour of 16-bit computers. Decibells dB Spectrum+ The Decibells dB Spectrum+ was an official clone of the ZX Spectrum+ for the Indian market, introduced in 1988 by Deci Bells Electronics Limited, selling over 50000 units and achieving an 80% market share. Unofficial British Harlequin A British clone of the 48K ZX Spectrum, Harlequin was designed and developed by Chris Smith, to aid the reverse engineering of the ZX Spectrum custom ULA chip, and its research documentation. Completed in 2008, it is the first 100% timing compatible clone. Until 2012/13 the Harlequin existed only as a breadboard prototype, but recently, José Leandro Martínez, Ingo Truppel, and others produced a limited number of PCB versions as an exact board replacement for an actual ZX Spectrum. Czech & Czechoslovak Bobo64 The Bobo64 was an advanced Czech computer compatible with the ZX Spectrum, developed by Václav Daněček between 1986 and 1987. It has many enhancements over the original ZX Spectrum, including 256×256 graphics with attributes per 8×1 pixels, and 512×256 graphics. Unlike other Czechoslovak home-made ZX Spectrum clones, the Bobo64 gained some popularity, and was built by dozens of enthusiasts. Didaktik series The Didaktik was a series of home computers produced by Didaktik in Skalica, in the former Czechoslovakia. The first model compatible with the ZX Spectrum was the Didaktik Gama, based on the U880 or Zilog Z80 processors and the original ULA chip. It was produced in three variants between 1987 and 1989. The Gama has a built-in 8255 chip (used for the Kempston joystick, and also as a printer port) and 80KB RAM, adding an alternative memory bank from the address 32768 to 65535. The Gama was followed by the cheaper Didaktik M (first variant released in 1990; the second in 1991). The model M had a modernised case, Sinclair and Kempston Joystick ports, and a keyboard with cursors and reset key – the design, however, was of lower quality than the Gama. Its screen aspect ratio and display timing are different from the original ZX Spectrum because the M uses a different ULA chip, compatible with the Russian clone Baltik. The final model was the Didaktik Kompakt (1991) which integrated all previous M hardware with a 3.5″ floppy disk drive. Unlike previous versions, the Didaktik 192K was an amateur project, partly combining the hardware of