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,
use browser return to go back 		  © PROJECT ENGINEER:
WALTER - PE1ABR.

memwalter.jpg
mem_walter_1		 memwalter.jpg
mem_walter_2
memwalter.jpg
mem_walter_3		 memwalter.jpg
mem_walter_4
 
Original first HTML code: C.L. van Soelen

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