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.


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


Back to Photograph section on previous page




wmem518.htm
by Walter - PE1ABR - 2020-07-30