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added build and test document.
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@ -150,3 +150,8 @@ I uploaded new versions of the component overview drawing and the ZX81+38 BOM.
The drawing has the position of the crystal, and the 15pF capacitors corrected, and the Value of RP1 corrected from 1K to 10K. 1K probably works, (with revision 1.9 PCB's that use A8 not A8' but both the schematic the BOM uses 10K, as does the original ZX-81.
The BOM only has the correction that the 3.5mm jacks are not CLIFF FT6320 (that is the wrong model), but the cheaper FC68131, that doesn't have switches and has the correct pin arrangement.
By the way the BOM is in the open source open office .ODS format, which can be opened with the free open office software, or an online tool.and probably also with Microsofts spreadsheet tool if you choose to open a .ODS file with it. I prefer open source formats..
# Building and Testing the ZX81+38
I wrote a document explaining the build process of the ZX81+38. For inexperienced hobbyist note that building the ZX81+38 is NOT a simple affair, you need to have experience in soldering. Also I explain the process of finding the fault if your ZX81+38 doesn't work at first try. Please read the "building and testing the ZX81+38" document.
If you have any questions or remarks, you can reach me at mahjongg@xs4all.nl
Also I might, for a fee, program (and test) a 27C256 EPROM for you, if you do not own an EPROM programmer. Please contact me at my e-mail address.