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 (23/05/2020)

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Latest buyer:
m***1 (40)
Fixed price:
Shipping Costs:
From only US$8.00
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Number Sold:
9 (View history)
Buyer Value Date and hour Quantity bought
m***1 (40) US$89.90 23/05/2020  09:41:07 1
t***n (5) US$89.90 13/05/2020  09:18:25 1
S***n (1) US$94.50 03/03/2020  11:02:23 1
b***9 (8) US$89.00 28/01/2020  11:06:30 1
k***t (13) US$89.00 24/01/2020  13:21:35 1
M***e (4) US$89.00 20/01/2020  18:41:00 1
d***a (0) US$89.40 04/01/2020  18:06:54 1
s***a (0) US$82.00 01/01/2020  17:25:10 1
Z***a (0) US$99.50 23/11/2019  05:40:58 1
Feedback on this Item
PositivePositive t***n (5) Kit arrived in very good condition due to the good packaging. Working fine, a nice and difficult project to do. Only a duplicate R62 wrong PCB print. 17/06/2020  07:06:22
PositivePositive S***n (1) Thanks!!! All components were neatly arranged in sachets, which greatly facilitated the soldering of the board! Everything was laid without errors! 18/03/2020  18:27:24

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 : 39841

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ZX NUCLEON 512KB - Pentagon (~ZX Spectrum) clone, last series, last chance !
Self home-made DIY Kit (PCB and all components, not soldered)

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.

CAUTION Important! If you would like to build a kit yourself, please note that you agree to the following purchase
notice: It is a very complicated design, the components are very densely mounted on the PCB, to build it requires
high skills in electronics and high knowledge and instrumentation, if by chance the board does not work on the first
switch-on! Unfortunately, I myself have no time to provide help-line either personally or remotely! Therefore,
please purchase the kit only if you know that you are able to find a possible problem yourself and solder extremely
complex constructions. Thank you.

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 : US$8.00 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
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