Densan DVE-486-20A (9295A) - Image 1
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Densan DVE-440(9214)
Densan DVE-440(9214)
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Densan DVE-486-22 (9387A)
Densan DVE-486-22 (9387A)

Densan DVE-486-20A (9295A)

Product Name
Densan DVE-486-20A(9295A) VME 486-class single-board computer.
Product Overview
Densan DVE-486-20A belongs to the Densan DVE-486 VME SBC family. The 9295A marker identifies the board revision. Public surplus listings for the 20A revision were not retrieved with CPU, memory and I/O details; the information below combines confirmed Densan 486-family VME context with Intel 80486 architecture data applicable to 486-class SBCs.
Category:
Description
Technical Specifications
  • CPU architecture: Intel 80486-class 32-bit x86.
  • Standard 80486 parameters: 32-bit data bus, 32-bit address bus, integrated L1 cache on most DX grades, on-die FPU on DX variants, 25 to 100 MHz clock range across the 486 family.
  • Board revision: 9295A.
  • Memory size, cache configuration, BIOS, storage interface and VME controller details for 20A: not included in retrieved public documentation.
  • Power requirement: confirm from the original VME backplane and Densan label.
Key Features
  • VMEbus integration for modular industrial computing.
  • 486-class real-mode, protected-mode and floating-point support for legacy control software.
  • Replaceable as an exact 9295A revision within qualified systems.
Application Scenarios
  • Legacy semiconductor manufacturing controllers.
  • Industrial automation stations requiring 486-era software compatibility.
  • Test equipment, data-acquisition systems and real-time control cabinets.
Performance Parameters
  • Instruction throughput depends on the installed 486 grade, clock frequency, cache size and memory wait states.
  • Standard 486DX implementations provide integrated floating-point performance; SX implementations require an external FPU option where the original design supports it.
  • Board-level I/O throughput must be validated with the original VME driver software.
Material Composition
  • Multilayer FR4 VME PCB.
  • 80486 processor in PGA or surface-mount package according to the board revision.
  • SRAM/DRAM modules, BIOS EEPROM/Flash, VME interface ASIC, connectors and passive components.
Structural Characteristics
  • VME 6U or double-height layout according to the original Densan mechanical drawing.
  • Processor, memory bank, BIOS, serial/parallel I/O and VME interface controller on one card.
  • Mounting holes, ejector handles and backplane connectors matched to the host rack.
Working Principle
The 486 processor executes BIOS and operating-system code from onboard memory, manages interrupts and DMA through the VME interface, and exchanges data with backplane masters and I/O slaves. Memory cycles, I/O cycles and VME arbitration follow the installed firmware and the 80486 bus protocol.
Installation Requirements
  • Power down the VME chassis before insertion.
  • Confirm processor revision, memory population and jumper settings from the 9295A label.
  • Verify VME slot, backplane signalling and power rails before startup.
  • Load the approved BIOS and real-time operating system image for the 486 SBC.
Usage Precautions
  • Use ESD protection when handling the processor and memory devices.
  • Do not substitute DVE-486-20A(9295A) for 22/9387A or 22S variants without full electrical verification.
  • Avoid operation outside the original temperature, voltage and ventilation limits.
  • Inspect for capacitor aging, connector oxidation and firmware corruption before return to service.
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