Memory modification The first build option for the NDH-518. With UP/DOWN counter and home-made opto encoder control ( with older original 1984 hand-drawn version of the up/down PCB )  + eprom BIN-BCD decoder in a 27C32 EPROM for 4 x 64 channels display. I didn't had the GAL stuff yet. Click on pictures to enlarge    Jump back to the NRD-515 webpage for all the hardware info

© PROJECT ENGINEER: WALTER - PE1ABR.

Walter's memory_1	Walter's memory_2
Walter's memory_3	Walter's memory_4

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