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Major Classification Hardware
Manufacturer Digital Equipment Corporation
Type Sub Assembly
Description Digital to Analog Converter in Dec 340 Display
Click on this thumbnail to see a larger image
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
See Also Item(s)
  • 340 Display System
  • System Modules in Dec 340 Display
  • Comments 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.
    Owned By Tony Epton
    Acquired From Resource Recycling 1997