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The Pentagon (Пентагон) home computer is a clone of the British-made Sinclair ZX Spectrum 128. It was manufactured by amateurs in former Soviet Union. Its PCB was copied all over the USSR, which made it the most widespread Soviet ZX Spectrum clone. Many simple devices (upgrades) were invented to connect to the Pentagon with a soldering iron.
The latest model is the Pentagon 1024SL v2.3, which includes most of the upgrades of the standard Spectrum architecture, including 1024 KB RAM, Beta 128 Disk Interface and ZX-BUS slots (especially for IDE and General Sound cards).This model features a "turbo" mode (7 MHz instead of the original's 3.50 MHz).
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