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
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
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Component side, PCB version A, D41256
Solder side, PCB version A, D41256
Component side, PCB version A, HM50256
Solder side, PCB version A, HM50256
Component side, PCB version A, TMM41256
Solder side, PCB version A, TMM41256
Component side, PCB version B
Solder side, PCB version B
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