A photo of the top side of the Micro-ZX81.
At the right side you can see the DIP Z80 processor and next to it the expansion connector. The keyboard connectors are at the top, the video output connector is next to the potmeter on the left.
A photo of the bottom side of the Micro-ZX81.
Bottom SMD components include the EPROM, 245 nop gate and separation resistor network for the data bus. At the top you can see the resistors for the keyboard port.
Another photo of the top side of the Micro-ZX81.
You can see that in the prototype I soldered the top pins of the Z80 processor as well. Remember to do this before soldering in the expansion connector.