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Norsk Data hardware - ND-1001.4.1.5 - Norsk Data hardware - ND-100


324129 - PCB 3042 - N-100 512 KB RAM

Description

  • 512 KB with dynamic memory for the ND-100 crate.
  • Arranged as 22 bits words (16 bits ND-100 word (or 2 bytes) + 6 bits ECC).
  • Using 22 pieces of DRAM chip for the memory, 262144 x 1 bit x 22 pieces (total 704 KB).
  • Some cards have the LED for "½-1 MB active" mounted even that memory part is not present.
  • Print: A   ECO: D
  • Print: B   ECO: D
  • PCB size 367 x 280 mm, 4 layers
  • Release date xx. xxx. xxxx

Chipset

LEDs

  • Upper limit display
  • LD4 (yellow) - ½-1 MB active (on some cards)
  • LD3 (yellow) - 0-½ MB active
  • LD2 (red) - ERROR - memory error
  • LD1 (red) - DISABLE - ECC disabled

Straps

  • Memory size

Switches

  • TH1 - Lower limit memory address
  • TH2 - Lower limit memory address
  • TH3 - Lower limit memory address
  • SW1 - ECC disable switch

Connectors

  • (A) Dummy
  • (B) Not present
  • (C) Standard ND-100 system bus
ND-324129
Component side, PCB version A, D41256

ND-324129
Solder side, PCB version A, D41256

ND-324129
Component side, PCB version A, HM50256

ND-324129
Solder side, PCB version A, HM50256

ND-324129
Component side, PCB version A, TMM41256

ND-324129
Solder side, PCB version A, TMM41256

ND-324129
Component side, PCB version B

ND-324129
Solder side, PCB version B

This page was last updated 27. Jan. 2025
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