Make this my favourite ZX NUCLEON 512KB - ZX Spectrum 128KB & Pentagon 512KB clone

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:
14 days, 14h:20m:44s
Quantity Available
Latest buyer:
w***k (0)
Fixed price:
US$149.00 Buy now!
21.00% VAT, Duty and handling fees may be payable on Price & Shipping on receipt
Shipping Costs:
From only US$4.00
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Number Sold:
8 (View history)
Buyer Value Date and hour Quantity bought
w***k (0) US$145.00 17/05/2021  23:26:02 1
M***e (4) US$94.90 30/11/2020  20:53:09 1
R***2 (0) US$129.90 20/10/2020  19:00:13 1
t***x (3) US$148.00 28/09/2020  10:12:55 1
m***o (1) US$149.00 26/05/2020  12:35:09 1
l***g (6) US$149.00 10/05/2020  16:33:52 1
v***1 (29) US$125.00 02/01/2020  20:40:43 1
g***e (21) US$134.50 09/12/2019  19:51:31 1
Feedback on this Item
PositivePositive t***x (3) Arrived in 4 working days and the computer is amazing. Had to replace the power jack with a 2.1mm one b/c my original Speccy 48K+ PSU did not fit :+1: 10/10/2020  11:53:43
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 (21) Great seller and a really nice board. Awesome communication and the board was packed very well. 15/01/2020  15:10:45

Item Number : 39999

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Fixed price: US$149.00
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ZX NUCLEON 512KB - Pentagon 128/512KB and ZX Spectrum 128KB clone

(Assembled, soldered and tested PCB + SCART cable)

I do not sell products to Russia, Belarus and Ukraine due to illegal copying of my products in these countries!


ZX NUCLEON 512KB is a 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, Pentagon 1993 ROM (NEW)
- 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)

Address to project webpage:

Tested with DivIDE 2k14 (Lotharek version), DivMMC Lite (Bytedelight version), Betadisk 128X, ZX-VGA-JOY

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.

The PCB is complete, including connectors for connecting the keyboard (not in the photo).
Illustration photos, each board is assembled with different but compatible components!


Shipping and Payment

Item Location:
Karlovy Vary, Drahovice, Czech Republic
Shipping conditions:
Buyer pays shipping expenses
Shipment fee:
  • To Czech Republic :
  • First Class Post : US$4.00 For initial item, US$1.00 Per additional item
  • To EU :
  • Airmail Post : US$16.00 For initial item, US$1.00 Per additional item
  • To Europe (Non EU) :
  • Airmail Post : US$16.00 For initial item, US$1.00 Per additional item
  • To Americas (Non USA) :
  • Airmail Post : US$20.00 For initial item, US$3.00 Per additional item
  • To Rest of World :
  • Airmail Post : US$20.00 For initial item, US$3.00 Per additional item
  • To USA :
  • Airmail Post : US$20.00 For initial item, US$3.00 Per additional item
Shipment terms:
Not specified
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The seller accepts all responsibility for this listing

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