I have a main unit, joystick and power adapter.
type computer
country CCCP
year 1991
os basic
cpu Z80A
speed 3.54 MHz
ram 48 KB
rom 16 KB
graphic 256×192
colors 8
sound 1 channel, 5 octaves
ports expansion, tv, cassette
The DELTA-S — A Bulgarian ZX Spectrum Clone
The DELTA-S is a Bulgarian clone of the Sinclair ZX Spectrum Plus, produced in Bulgaria during the 1980s as part of the Eastern Bloc’s widespread practice of reverse-engineering and domestically producing Western computers that were subject to COCOM (Coordinating Committee for Multilateral Export Controls) trade restrictions. Bulgaria, like other Warsaw Pact countries, developed a significant domestic electronics industry partly through licensed production and partly through unauthorised cloning of Western designs, making computers accessible to institutions and eventually individuals who could not obtain or afford imported Western machines.
Bulgaria’s Computing Industry
Bulgaria was one of the most significant computer producers within the Eastern Bloc, becoming a major manufacturer of peripherals and systems for COMECON (the Soviet economic organisation) under the brand IZOT. The country produced IBM-compatible machines, disk drives, and various computer peripherals at scale, earning the nickname ”the Silicon Valley of the East” within the Soviet sphere. The DELTA-S represents a different aspect of this industry — the production of home computers for domestic use rather than institutional computing.
ZX Spectrum Compatibility
As a Spectrum Plus clone, the DELTA-S was compatible with the enormous ZX Spectrum software library — thousands of games, educational programs, and utilities that had been developed throughout the 1980s. This compatibility was crucial for Eastern European clones, as it gave users immediate access to useful software without requiring domestic software development. The DELTA-S represents a fascinating intersection of Western design and Eastern European manufacturing — a testament to the universal appeal of the ZX Spectrum platform.