Memory modification
The first build option for the NDH-518.


With UP/DOWN counter and home-made opto encoder
( with older original 1984 version of the up/down PCB )
 + eprom BIN-BCD decoder in 27C32 for 4 x 64 channels display.

Click on pictures to enlarge
  © PROJECT ENGINEER:
WALTER - PE1ABR.


memwalter.jpg
Walter's memory_1
memwalter.jpg
Walter's memory_2
memwalter.jpg
Walter's memory_3
memwalter.jpg
Walter's memory_4
 
Original first HTML code: C.L. van Soelen


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wmem518.htm
by Walter - PE1ABR - 2013-03-18