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Major Classification
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Hardware
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Manufacturer
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Digital Equipment Corporation
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Model
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Type
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Sub Assembly
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Description
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Digital to Analog Converter in Dec 340 Display
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Click on this thumbnail to see a larger image
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Modules from Fan Side | 
Modules from Plug Side | 
Resistors Module Detail |
Wire wound resistors just visible behind fan | 
Resistor Module Detail | 
Resistor Module before removing side panel |
Resistor Module - bugs kept away | 
Wire wound resistors - Detail | 
Heat sink module detail |
Heat sink module - PCB exposed | 
Heat sink module - Transistors detail - 1 | 
Heat sink module - Transistors detail - 2 |
Heat sink module - Transistors detail - 3 |
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See Also Item(s)
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340 Display System
System Modules in Dec 340 Display
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Comments
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The DAC consists of 3 modules.
From Left to Right:
Resistor Network, transistors on heatsinks, Resistor network
Each resistor network contains 12 wire wound resistors - giving a total of 24.
The heat sink module contains 4 sets by 7 transistors where one of the seven transistors is mounted and circuited differently.
This suggests 4 by 6 transistors - again 24.
Hence 24 bits = 10 bits for X, 10 bits for Y , 3 bits for intensity, 1 spare ?
Some of the wire wound resistors appear to have lost their insulation - suggesting short circuits.
Fans suggest huge amount of cooling needed.
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Owned By
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Tony Epton
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Acquired From
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Resource Recycling 1997
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