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mahjongg2
2020-10-18 22:36:10 +02:00
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@@ -17,8 +17,8 @@ ZX81+38rev1,5.zip contains all gerber and drill files for the working updated an
The file ZX81+38rev1,5.pdf is the schematic of the corrected revision 1.5 (in black and white)
And I will upload kiCad files after I know revision 1.5 is working well.
We found one more error, that I have fixed in revision 1,6:
the keyboard matrix is connected to eigh Address lines, A8 to A15, but the error is that for A8 a version is used that comes from the signal line passing through a 10K resistor (R1) so it is signal A8' , that is not correct, the keyboard needs unattenuated signals, so A8, not A8'. otherwise the resulting dataline does not go low enough to reliably register as "low".
And I will upload kiCad files after I know revision 1.6 is working well.