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Densan DVE-486-20A (9295A)
Densan DVE-486-20A (9295A)
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Densan DVE-486-22S (9387A)
Densan DVE-486-22S (9387A)

Densan DVE-486-22 (9387A)

Product Name
Densan DVE-486-22(9387A) VME 486-class single-board computer.
Product Overview
Densan DVE-486-22(9387A) is confirmed in industrial surplus channels as a VME SBC, single-board computer PCB, made in Japan and supplied as working surplus. The model line DVE 486/22S is associated with the same 9387A listing family. CPU clock, memory size and onboard I/O for the 22 non-S variant are not included in retrieved public documentation.
Category:
Description
Technical Specifications
  • Product class: VME single-board computer.
  • Revision: 9387A.
  • Country of manufacture: Japan.
  • Representative surplus packing data: approximately 12 x 12 x 12 inches, 8 lbs packaged weight for working-surplus units.
  • 486-class CPU parameters: 32-bit Intel 80486 architecture; clock, cache and FPU capability depend on the installed processor grade.
  • Memory, BIOS, storage and VME controller details: not included in retrieved public documentation.
Key Features
  • VME modular SBC format for legacy industrial systems.
  • Direct replacement within equipment originally qualified for 9387A.
  • Working-surplus and refurbished supply options available through industrial MRO vendors.
Application Scenarios
  • Semiconductor equipment controllers.
  • Factory automation and process-control computing.
  • Legacy test systems requiring 486-era VME architecture.
Performance Parameters
  • Compute performance is defined by the installed 486 processor frequency, L1 cache, FPU presence and memory timing.
  • VME transfer performance depends on the onboard VME interface controller and backplane configuration.
  • Exact benchmarks must be measured on the original system firmware.
Material Composition
  • Industrial multilayer FR4 VME PCB.
  • 80486 processor, memory devices, BIOS/Flash, VME bridge components and passive elements.
  • Edge connectors with anti-corrosion plating according to the manufacturing revision.
Structural Characteristics
  • VME SBC layout with processor, memory, firmware and I/O sections.
  • Backplane VME connector plus onboard serial or peripheral headers per original design.
  • Mechanical format compatible with standard VME card cages; confirm 6U or double-height from the board label.
Working Principle
The onboard 486 processor boots from BIOS/Flash, initializes memory and VME interface hardware, and participates in VMEbus mastering or slaving according to the installed firmware. Data moves between system memory, I/O devices and backplane modules under firmware-controlled arbitration.
Installation Requirements
  • Remove power from the VME rack before installation.
  • Match the 9387A revision, memory configuration and jumper settings to the host system.
  • Confirm VME slot type, processor cooling clearance and backplane signal assignment.
  • Reload the approved operating-system image and VME driver set before operation.
Usage Precautions
  • Handle with ESD grounding because processor and memory devices are static sensitive.
  • Do not replace DVE-486-22(9387A) with DVE-486-20A or 22S variants without full cross-verification.
  • Inspect aged electrolytic capacitors, battery backup devices and connector pins before power-up.
  • Store in anti-static, low-humidity conditions when not installed.
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