Pentagon (computer)
Encyclopedia
Home computer
Home computers were a class of microcomputers entering the market in 1977, and becoming increasingly common during the 1980s. They were marketed to consumers as affordable and accessible computers that, for the first time, were intended for the use of a single nontechnical user...
was a clone of the British-made Sinclair ZX Spectrum 128
ZX Spectrum
The ZX Spectrum is an 8-bit personal home computer released in the United Kingdom in 1982 by Sinclair Research Ltd...
. It was manufactured by amateurs in the former Soviet Union
Soviet Union
The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....
. 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 last Pentagon model was the Pentagon 1024SL v2.3, which included most of the upgrades of the standard Spectrum architecture, including 1024 KB
Kilobyte
The kilobyte is a multiple of the unit byte for digital information. Although the prefix kilo- means 1000, the term kilobyte and symbol KB have historically been used to refer to either 1024 bytes or 1000 bytes, dependent upon context, in the fields of computer science and information...
RAM, Beta 128 Disk Interface and ZX-BUS slots (especially for IDE and General Sound cards). This model also featured a "turbo" mode (7 MHz instead of the original's 3.50 MHz).