Make this my favourite ZX NUCLEON 512KB - clone Pentagon 128/512 (~ZX Spectrum 128KB) into ZX Spectrum case LAST PIECE

Retro Computers >> Sinclair >> Sinclair ZX Spectrum >> Hardware >> General / Add-Ons
Listing type:
Fixed Price Multiple Items
Item Condition:
Seller location:
Karlovy Vary, Drahovice, Czech Republic
Ending in:
This listing is closed (26/05/2020)

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Latest buyer:
m***o (1)
Fixed price:
$149.00 USD
Shipping Costs:
From only $8.00 USD
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Number Sold:
4 (View history)
Buyer Value Date and hour Quantity bought
m***o (1) $149.00 USD 26/05/2020  12:35:09 1
l***g (6) $149.00 USD 10/05/2020  16:33:52 1
v***1 (29) $125.00 USD 02/01/2020  20:40:43 1
g***e (17) $134.50 USD 09/12/2019  19:51:31 1
Feedback on this Item
PositivePositive m***o (1) Product is fitting to the description, high-quality product design/made, tested, well packaged, delivered in a short time. I recommend seller 05/06/2020  20:34:35
PositivePositive l***g (6) Board arrived today, and is in full working order. Thank you! 27/06/2020  13:32:29
PositivePositive v***1 (29) ok 05/02/2020  18:27:38
PositivePositive g***e (17) Great seller and a really nice board. Awesome communication and the board was packed very well. 15/01/2020  15:10:45

WARNING: Due to the impact of coronavirus, delivery times across the World are severely impacted, with some countries refusing to accept postage completely.

Item Number : 39999

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ZX NUCLEON 512KB - Pentagon (~ZX Spectrum) clone, last series, last chance !
Assembled, soldered and tested PCB + SCART cable

ZX NUCLEON 512KB is a new clone of Pentagon 128KB/512KB computer, respectively approximate ZX Spectrum 128KB. The motherboard is the same size as the ZX Spectrum 48KB computer board and will fit into his case.

Electrical wiring is largely based on Pentagon 128KB/512KB computer and keeps timing important parts of the computer! ZX NUCLEON 512KB uses modern SRAM memory instead of historical dynamic RAM. There are also some minor modifications, bug fixes, and a better video part including RGB video output. The computer also contains a program sound generator AY-3-8910A.

Important improvements opposite all competing projects: All In/Out signals between the CPU and the bus are amplified by drivers!
This means greater capabilities and reliability with connected external peripherals and CPU protection against damage.

Why buy ZX NUCLEON 512KB and not another, competitive project?

The vast majority of the best quality software from the 199x-20xx period comes from the countries of the ex-USSR. This software largely uses Pentagon timing and does not work on ZX Spectrum and its derivatives. That's why ZX NUCLEON is the best choice for the future.


- CPU tact frequency 3,500MHz (classic Pentagon mode), Pentagon video timing

- 512KB fast RAM, 32KB classic 128's ROM

- RAM paging compatible with Pentagon 512KB or 128KB or Spectrum 128KB (bits 0,1,2,6,7 on port 32765d)

- Function blocking 512KB with switch (128KB forced mode)

- Build on quality LS/ALS integrated circuits

- Two video output formats: S-VHS (PAL) and analog RGB (NTSC not supported)

- Mixed audio stereo output: AY-3-8910 (switchable ABC or ACB mode) + BEEP + Tape in/out

- Tape in amplifier

- Original ZX Spectrum rubber keyboard supporting

- All I/O signals between the CPU and the bus are amplified by drivers

- Classic power source from ZX Spectrum (9VDC with central negative pole)

Link for documents download:

Tested with DivIDE 2k14 (Lotharek version), DivMMC Lite (Bytedelight version)

This is a clone of the Russian Pentagon computer, just an approximate clone of the ZX Spectrum!
Therefore, it may not be compatible with all devices designed specifically for ZX Spectrum.
Incompatibility with your device is not a reason for complaint.

Thank you for your support and have a nice day :-) CSS Electronics

Overview photos, real PCB can be equipped with compatible components of other brands:









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Shipping and Payment

Item Location:
Karlovy Vary, Drahovice, Czech Republic
Shipping conditions:
Buyer pays shipping expenses
Shipment fee:
  • To Czech Republic :
  • First Class Post : $8.00 USD For initial item, $1.00 USD Per additional item
  • To EU :
  • Airmail Post : $16.00 USD For initial item, $1.00 USD Per additional item
  • To Europe (Non EU) :
  • Airmail Post : $16.00 USD For initial item, $1.00 USD Per additional item
  • To Americas (Non USA) :
  • Airmail Post : $20.00 USD For initial item, $3.00 USD Per additional item
  • To Rest of World :
  • Airmail Post : $20.00 USD For initial item, $3.00 USD Per additional item
  • To USA :
  • Airmail Post : $20.00 USD For initial item, $3.00 USD Per additional item
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