Pentagon (computer)

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Soviet home computer

title: "Pentagon (computer)" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["zx-spectrum-clones", "computer-related-introductions-in-1989", "1989-establishments-in-the-soviet-union", "soviet-computer-systems"] description: "Soviet home computer" topic_path: "general/zx-spectrum-clones" source: "https://en.wikipedia.org/wiki/Pentagon_(computer)" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Soviet home computer ::

::data[format=table title="Infobox information appliance"]

FieldValue
namePentagon
akaПентагон
imagePentagon-1024SL1.jpg
captionPentagon-1024SL v1.x
typeHome computer
release_date
mediatape, floppy disks, hard drives (depending on models)
osSinclair 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)
compatibilityZX Spectrum 128
relatedATM (computer)
website
::

| name = Pentagon | aka = Пентагон | logo = | image = Pentagon-1024SL1.jpg | caption = Pentagon-1024SL v1.x | developer = | manufacturer = | family = | type = Home computer | generation = | release_date = | lifespan = | price = | discontinued = | units_sold = | units_shipped = | media = tape, floppy disks, hard drives (depending on models) | os = Sinclair BASIC, TR-DOS | power = | system_on_chip = | cpu = КР1858ВМ1/3, Т34ВМ1, Z80A, B, H @ 3.5 MHz (7 MHz turbo mode) | memory = 48 to 4096KB (depending on model) | storage = tape, Beta 128 Disk Interface, hard drives (depending on models) | memory_card = | display = | graphics = 256x192, 384x304, 512x192 monochrome | sound = Beeper, Covox, UltraSound (depending on model) | input = | controllers = | camera = | touchpad = | connectivity = | platform = | online_services = | dimensions = | weight = | top_game = | compatibility = ZX Spectrum 128 | predecessor = | successor = | related = ATM (computer) | website = The Pentagon () 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.

Many simple devices (upgrades) were invented to connect to the Pentagon with some soldering.

Versions

  • 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)

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).

::figure[src="https://upload.wikimedia.org/wikipedia/commons/1/12/p1024sl2_motherboard.jpg" caption="Pentagon-1024SL v2.x"] ::

Upgrades from the original ZX Spectrum

References

References

  1. "Pentagon — SpeccyWiki".
  2. "Russian Most Popular Spectrum Models".
  3. "Информация".
  4. "Pentagon — SpeccyWiki".

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

zx-spectrum-clonescomputer-related-introductions-in-19891989-establishments-in-the-soviet-unionsoviet-computer-systems