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| R3, R21, R27, R28 R4, R6, R7 | 2 | 10uF | Polarized capacitor | | D1, D2 | 2 | 1N5817 | Schottky diode | | | | Tayda | A-1138 | | | | | | | | | | Tayda | A-1135 | | R5, R29 | 2 Internal clock with manual control. Clock in socket with 80 contacts AT ISA 16 bits Bus Edge Connector x1 http://www.ritrontek.com/uploadfile/2016/1026/20161026105231124.pdf#page=70 Highspeed card edge connector for PCB's with 70 contacts (polarized Highspeed card edge connector for PCB's with 20 contacts (polarized Highspeed card edge connector for 1.6mm PCB's with 08 contacts (polarized Highspeed card edge connector for PCB's with 08 contacts (not polarized Highspeed card edge connector for PCB's with 08 contacts (not polarized Highspeed card edge connector for 2.4mm PCB's with 05 contacts (polarized Highspeed card edge card connector socket for 1.57mm PCBs, vertical (source: https://suddendocs.samtec.com/prints/hsec8-1xxx-xx-xx-dv-x-xx-footprint.pdf 0.8 mm BGA-64, 10x10 raster, 4.201x4.663mm package, pitch 0.4mm.

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