Pentagon (computer)

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Pentagon-1024SL v1.x
Also known asПентагон
TypeHome computer
Release date1989; 34 years ago (1989)
Mediatape, floppy disks, hard drives (depending on models)
Operating systemSinclair BASIC, TR-DOS
CPUКР1858ВМ1/3, Т34ВМ1, Z80A, B, H @ 3.5 MHz (7 MHz turbo mode)
Memory48 to 4096KB (depending on model)
Storagetape, Beta 128 Disk Interface, hard drives (depending on models)
Graphics256x192, 384x304, 512x192 monochrome
SoundBeeper, Covox, UltraSound (depending on model)
ZX Spectrum 128
RelatedATM (computer)

The Pentagon (ru: 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 some soldering.[2]


  • 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)[3]

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).[4]

Pentagon-1024SL v2.x

Upgrades from the original ZX Spectrum[edit]


  1. ^ "Pentagon — SpeccyWiki".
  2. ^ "Russian Most Popular Spectrum Models". Archived from the original on 2012-07-16. Retrieved 2004-09-08.
  3. ^ "Информация".
  4. ^ "Pentagon — SpeccyWiki".

External links[edit]