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- 21:08, 24 July 2016 Mahjongg talk contribs uploaded File:PSG for ZX81+35 REV 1.4.pdf (revised version with resistor dividers between PSG and SD-card slot to convert 5V PSG levels to 3V3 SD-card levels, datalines are pulled up clock and latch lines not (pulled low by resistor divider).)