# Z80 NOP Tester A Z80 NOP Tester kit that can be used to verify the authenticity and functionality of Z80 microprocessors. - **Seller:** [Alberto Gonzalez's store](https://lectronz.com/stores/agonzalez), Dundee, UK - **Price:** £14.00 (GBP, before shipping and taxes) - **Availability:** In stock - **Categories:** Test equipment, Retrocomputing - **Product page:** https://lectronz.com/products/z80-nop-tester ## Links - [Documentation](https://codeberg.org/albertogonzalez/Z80_NOP_Tester/src/branch/master/docs/assembly.md) - [Code](https://codeberg.org/albertogonzalez/Z80_NOP_Tester) ## Images ![Z80 NOP Tester](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTk1NDcsInB1ciI6ImJsb2JfaWQifX0=--c10cfb8e0fb2fa892c54d883d34047f97ca2ef66/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/Z80_NOP_Tester_01_RevA01.jpg) ![Z80 NOP Tester](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTk1NTEsInB1ciI6ImJsb2JfaWQifX0=--ec2f2d8a82141328b5119e95f67b4a963ba5c503/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGVnIiwicmVzaXplX3RvX2xpbWl0IjpbOTYwLDY0MF0sInNhdmVyIjp7InN0cmlwIjp0cnVlfX0sInB1ciI6InZhcmlhdGlvbiJ9fQ==--4e27bac8cdfb621fb828f6a3a5982fe1a423b516/Z80_NOP_Tester_02_RevA01_working.jpeg) ![Z80 NOP Tester](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTk1NTUsInB1ciI6ImJsb2JfaWQifX0=--4a3ccbca21b27ae048f0ff1520e108ef67babfce/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/Z80_NOP_Tester_03_Adresses.jpg) ![Z80 NOP Tester](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTk1NTksInB1ciI6ImJsb2JfaWQifX0=--333d4ed8b09f8d55bf2480c01f9a47df1cadd650/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/Z80_NOP_Tester_04_Signals.jpg) ![Z80 NOP Tester](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTk1NjMsInB1ciI6ImJsb2JfaWQifX0=--f5b5b78447851486c5afe3270831a1b1d53aaa2c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/Z80_NOP_Tester_05_Clock_potentiometer.jpg) ![Z80 NOP Tester](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6NTk1NjcsInB1ciI6ImJsb2JfaWQifX0=--de01a40987bd75686afcca9e3d0ecafacb85c108/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/Z80_NOP_Tester_06_RevA02_kit.jpg) ## Description #### What is it? This is an easy-to-solder kit that uses only through-hole components. Once fully assembled, it allows you to verify the authenticity and functionality of Z80 microprocessors. #### Why did I make it? I started designing this **Z80 NOP Tester** after [the Zilog Z80 End Of Life announcement on April 15, 2024](https://codeberg.org/albertogonzalez/Z80_NOP_Tester/src/branch/master/docs/Littelfuse_PCN_Z84C00.pdf) and sourcing reliable Z80 microprocessors became increasingly challenging. #### What makes it special? There are other Z80 NOP tester alternatives out there, such as the one on the 8bit-museum website by Stephan Slabihoud. However, I couldn’t find any with all the features I was looking for in a Z80 Tester, so I added them to my design. These features include: - A **ZIF (Zero Insertion Force) socket**, ensuring that you can insert your Z80 IC with minimal force, preventing any damage to the microprocessor. - A power input with a **USB Type B connector** instead of the usual micro USB connector, which I found to be less sturdy and durable. - There is also a **JST-XH 2P** footprint with a 2.5mm pitch on the PCB that can be used as an alternative 5V power source in case you don't what to use the USB Type B connector. - A **power switch** that allows you to easily turn the device on and off without having to unplug it. This is useful if you want to test multiple Z80 chips in one session. - An **adjustable clock generator** with a range of approximately **4Hz to 90Hz**. - A total of **21 LEDs**, including one for each of the 16 address lines and LEDs for the M1, RFSH, MREQ, RD, and CLK signals. These LEDs provide a comprehensive visual representation of your Z80 microprocessor's operation. - Multiple **test points** for CLK, M1, RFSH, MREQ, RD. - 4 **mounting holes** in the corners for easy installation in a case. If you need to verify the authenticity of Z80 microprocessors and you like the sound of the previous features, this kit could be just what you're looking for. #### Note From 20 April 2026, the kit will include a new Rev. A02 PCB with slightly larger pads to facilitate soldering, as well as a new black, high-quality ZIF socket instead of the green one shown in some older photos. #### Warning Please note that this product is sold as a kit and requires assembly. Although this kit does not require soldering any SMD components, good soldering skills are essential for assembly. If you are not comfortable with soldering or lack experience in assembling electronic kits, I recommend seeking assistance or considering a different product. Proper assembly is crucial for the functionality and safety of the final product. Ensure you have the necessary tools and a suitable workspace before starting the assembly process. Happy building! ## Shipping policy Please ensure your address is full and correct before placing an order. Products are normally shipped within two business days, however during busy periods this may extend slightly. If your country is not listed as an available destination, please contact me and I will try to update the shipping information if possible. **Important notice for customers in the United States:** Unfortunately, due to the current import regulations in the United States, I am unable to ship to that country at this time. However, I will consider shipping to the United States should the regulations change in the future.