Harlequin 128K rev 2D large DIY kit (excl. ROM)



Large Harlequin rev 2D -BLACK- kit with comprehensive manual and parts

19 in stock


The awesome -BLACK- Harlequin 128K rev 2D DIY kit!

Offer is subject to placement errors.

NEW! Now with ZX Diag ROM!

(1 June 2021) The Harlequin rev 2D kits will now include a AM29F040B chip containing the ZX Diag software, and instructions how to use this ROM.
Since the AM29F040B chip is an EEPROM, you can reuse (parts of) it for any purpose, if you have a universal programmer such as the MiniPro (read more here).


The Harlequin rev 2D is a completely compatible ZX Spectrum clone, but without the ULA.
It’s built up completely of parts that can still be obtained easily.
You can build your own complete ZX Spectrum Toast Rack (clone) yourself!

The Harlequin rev 2D has stereo audio output at the right 3.5mm socket.

A fun challenge!

The Harlequin kit consists only of through hole parts, making soldering easy (the one SMD part is already presoldered).

What you need to assemble the kit is:
– a soldering iron + solder
– basic skills and creativity
– some patience! The kit will keep you busy for several hours.

The included comprehensive assemly manual includes some important hints and lots of instructions.

Package contents

This large kit consists of:

  • The (unassembled) Harlequin rev 2D printed circuit board
  • Presoldered SMD part: AD724 RGB to NTSC/PAL Encoder
  • All parts (except ZX Spectrum ROM) to complete the Harlequin rev 2D
    • Discrete parts
    • IC’s
    • IC sockets
    • Connectors
    • etc…
  • The ByteDelight complete and comprehensive 16 page DIY assembly guide to the Harlequin rev 2D!

The discrete parts are packed in bags with sequential numbers corresponding to the manual, and the bags also show the part numbers corresponding to the PCB.


No ZX Spectrum ROM is included because of IP rights.
These are known working ROM types which can be used on this board, by configuring some jumpers:
– Original 48K ROM which will run 128K games just fine (check our webshop stock for these!)
– Original 128K Toast Rack or +2 ROM  (check our webshop stock for these!)
– 27(C)256 EPROM
– 27(C)512 EPROM
– AM29F040 EEPROM (included)

! 28C256 is incompatible with this Harlequin board ! 

You can find the ROM files online, like e.g.: http://mdfs.net/Software/Spectrum/ROMImages/ (e.g. ‘128k.rom’), but we’re not allowed to include these.

ByteDelight has a small stock of original ROMs, check out the webshop – we’re not allowed to sell (E)EPROMs with ZX Spectrum ROM.

What is needed to finish the kit

To use the finished Harlequin board, you will need:
– A ZX Spectrum ROM
Some original ones might be available in the webshop, otherwise you can use the licence free SpectrumSE rom.

– A ZX Spectrum case with keyboard
E.g. an original or replica ZX Spectrum rubber keys case – yes, the Harlequin 128 fits in a rubber-key case and works with that membrane!
Or a ZX Spectrum Plus case.
Or any other ZX Spectrum case, like the DK’Tronics, Lo Profile or Saga.

– A TV with composite video or RGB input
– An RCA or RGB cable
We offer the Harlequin RGB to SCART cable in this webshop.

– An 8V – 14V power supply
With 5.5mm outer and 2.1mm inside diameter plug, and with the center pin having the negative voltage!
Most power supplies have the positive voltage as center pin. We offer power supplies here.


Instead of composite video or RGB, you can now use HDMI with the ZX-HD interface (that comes including HDMI cable), found in this web shop.

Other add-ons

To make loading games easy, choose one of our DivMMC SD card interfaces, such as the PRO ONE which also has dual joystick ports!


This is an unassembled kit! The photos are for reference.

The kit contents:

Example of an assembled Harlequin rev 2D (this offer is for an unassambled kit!) with DivMMC EnJOY! PRO ONE interface (not included, but found in this web shop):

The comprehensive 16 page DIY manual:



Additional information

Weight 0.5 kg
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5 thoughts on “Harlequin 128K rev 2D large DIY kit (excl. ROM)

  1. A well-shipped package,
    everything neatly packaged separately.
    Clear manual.
    Take the time to solder.
    Use good tools.
    First look at the video from Bytedelight, then you have an idea of the order of assembly.
    I am happy with the result.

  2. I gave myself a month to complete this board and completed in a week spending about 1 hour a day and was great building and learning to solder at the same time. I know it may not be as good as a seasoned person that can solder but it works and as I progressed, my soldering improved and is now my daily ZX Spectrum. For anyone new or seasoned to soldering, it is a great kit and easy to follow.

    I just need to justify and do another now as I now have a new found love for soldering and fixing things.

  3. Thank you for a wonderful project. The instructions were easy to follow, and the unit fired up first try.

    Michael Carter

  4. I bought one of these kits a (long) while ago. As soon as I took it out of the box I was intimidated by the sheer amount of soldering to be done, as I am not super experienced with soldering. However, I recently started putting it together. I went slowly, step by step, and today I finished the soldering.

    Here are my observations:
    . Everything is really well laid out – most of the components are in separate, labeled bags.
    . The instructions are very easy to follow. The only mistakes I made were from misreading on my part.
    . While challenging, this kit can easily be assembled by an intermediate level solderer – and will give you lots of practice!

    All in all, this is a super fun and rewarding kit. I would highly recommend it. And, don’t be intimidated – dive in!

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