Here we document the exciting experience of building a new board from scratch ZX Spectrum issue 4B. Thanks to innovative individuals like Charlie Ingley, who created a replacement ULA chip, this project is now possible. Initially, we designed and printed our own reproduction of Issue 4B and some other components that are not manufactured today. This version is the last board without the proprietary chip for the Spectrum 48k. It's a fantastic starting point for our project. Join us on this nostalgic adventure as we assemble the ZX Spectrum of our dreams!

To assemble or assemble a ZX Spectrum Issue 4B, you will need some basic tools and components. Here is a list of what you might need:

• Mounting kit: Make sure you have the complete kit of components needed to assemble the ZX Spectrum Issue 4B. This will include the motherboard and all electronic components such as resistors, capacitors, chips, sockets, etc.
• In this link you will find the list of components and their location plan on the board: ibon Zx spectrum issue 4B   and in this other the board and the components you need: PCB recreation Zx spectrum issue 4
• Welder and welding: A suitable soldering iron is essential for soldering components on the motherboard. Use good quality solder and choose the right soldering iron tip for precision soldering work.
• Flow: Flux is a material that helps improve the quality of solders, facilitating the fluidity of the tin and adhesion to the connections.
• Screwdrivers: You may need screwdrivers to secure the motherboard and other components to the ZX Spectrum case.
• Pliers and clamping tools: Tweezers and other holding tools can be useful for holding components in place while you solder them.
• Magnifying glass or vision aid: Since some components may be small and connections may be detailed, a magnifying glass or visual aid can help you ensure that the welds are accurate.
• Desoldering iron and desoldering wick: In case you need to fix errors or desolder components, a desoldering iron and desoldering wick can come in handy.
• Antistatic and precautions: Use an antistatic wrist strap to avoid damaging components with electrical shock. Work on an antistatic surface to protect components from static electricity.
• Manual and assembly guide: Make sure you have the manual or assembly guide specific to the ZX Spectrum Issue 4B. This will provide you with detailed instructions on how to assemble and connect the components correctly.
• Suitable workspace: Work in a clean, well-lit area to ensure you can see details clearly and avoid mistakes.
• Time and patience: Assembling electronic components can be a detailed and painstaking process. Take your time and make sure you do it patiently and carefully.

Please note that assembling electronic components can be a delicate process and requires soldering skills and knowledge.