Buiding up and testing the ZX81+38 revision 1,9
Project Building up the ZX81+38 | |
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A manual on how to build the ZX81+38 | |
Status | Initializing |
Contact | mahjongg |
Last Update | 2023-05-07 |
For those planning to build the ZX81+38, note this kit is NOT suitable for people who are not proficient in soldering. The ZX81+38 is not easy to solder, the design is dense and the solder pads are smaller than in most other designs. Also you will need to have the right tools, including an EPROM programmer. I suggest using the minipro TL866CS to program a 27C256 with four copies of the ZX-81.ROM file.
Make sure you use the latest files for the PCB, BOM and component overview drawing, and schematic, at this moment these are revision 1.9.
Start by soldering the lowest parts, that is , te flat lying resistors, and the resistor packs, and the diodes (the nine 1N4148 and the single skottky diode), also the three main sockets. see this picture:
Not that I'm not using sockets for the other IC's, but you can if you want, if to use dual wipe sockets, NOT round machined sockets, they are a disaster to put IC's into, and are not as reliable as they seem to be.