Memory modifications on a NDH-515.

Simple version with only one extra front-hole for a bankswitch (board)   + two GAL's (new kind of PROM) for BCD to BIN memory control and back from BIN to BCD for display.
Original 1 x 24 positions, now 8 x 24 channels display, with the same original memory chips.

Click on pictures to enlarge

   Jump back to the NRD-515 webpage for all the hardware info

Peter's memory_1

Peter's memory_2

Peter's memory_3

Peter's memory_4

Peter's memory_5

Peter's memory_6

Peter's memory_7

Peter's memory_8
Original first HTML code: C.L. van Soelen - PG9HF

   Back to photo part of the NRD-515 page

by Walter - PE1ABR - 2021-03-16