Pentagon (computer)

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Pentagon
Pentagon-1024SL1.jpg
Pentagon-1024SL v1.x
Also known as Пентагон
Type Home computer
Release date 1989; 27 years ago (1989)
Operating system Sinclair BASIC, TR-DOS
CPU КР1858ВМ1/3, Т34ВМ1, Z80A, B, H @ 3.5 MHz
Memory 48 to 1024 KB
Website pentagon.nedopc.com

The Pentagon (Пентагон) home computer was a clone of the British-made Sinclair ZX Spectrum 128. It was manufactured by amateurs in the former Soviet Union, following freely distributable documentation. Its PCB was copied all over the ex-USSR in 1991-1996, which made it a widespread ZX Spectrum clone. The name "Pentagon" derives from the shape of the original PCB (Pentagon 48), with a diagonal cut in one of the corners. [1]

Many simple devices (upgrades) were invented to connect to the Pentagon with a soldering iron.[2]

Versions[3][edit]

  • Pentagon 48K (1989 by Vladimir Drozdov )
  • Pentagon 128K (1991)
  • Pentagon 128K 2+ (1991 by ATM)
  • Pentagon 128K 3+ (1993 by Solon)
  • Pentagon 1024SL v1.x (2005 by Alex Zhabin)
  • Pentagon-1024SL v2.x (2006 by Alex Zhabin)
  • Pentagon ver.2.666 (2009 by Alex Zhabin)[4]

The Pentagon 1024SL v2.3 included 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 also featured a "turbo" mode (7 MHz instead of the original's 3.50 MHz).

Pentagon-1024SL v2.x

Upgrades from the original ZX Spectrum[edit]

  • Extra RAM ranging from 256 KB to 4 MB
  • Several soundboard possibilities such as Covox, SounDrive or DMA UltraSound
  • additional video modes: 512x192 monochrome, 384x304, 256x192x15 (without using attributes)
  • CMOS with persistent real-time clock
  • IDE Controller for hard drives
  • "Turbo Mode" that clocks the CPU up to 7 MHz

References[edit]

External links[edit]