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

© PROJECT ENGINEER: WALTER - PE1ABR.

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

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