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MVME-147A

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MVME-147A
May 15, 2026

MVME-147A

MVME‑147A 6U VME Single‑Board Computer (SBC) Motorola / Emerson / Curtiss‑Wright User Manual (Plain Text, No Images) – 2026 Part Number: MVME‑147A (also written MVME147A) Manufacturer: Motorola (later Emerson / Artesyn / Curtiss‑Wright) Form Factor: 6U VMEbus (VMEbus Rev B/C, not VME64) CPU: Motorola MC68030 @ 20 MHz (fixed for MVME‑147A) FPU: MC68882 @ 20 MHz DRAM: 8 MB standard (no parity) Application: Legacy industrial control, DCS/SIS, factory automation, original MVME‑147 upgrade, non‑VME64 systems Key Note: MVME‑147A = 20 MHz + 8 MB DRAM (no parity) + basic I/O + legacy VME Not compatible with MVME147‑02x (33 MHz / VME64) series

Description

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MVME‑147A

6U VME Single‑Board Computer (SBC)

Motorola / Emerson / Curtiss‑Wright

User Manual (Plain Text, No Images) – 2026

Part Number: MVME‑147A (also written MVME147A)
Manufacturer: Motorola (later Emerson / Artesyn / Curtiss‑Wright)
Form Factor: 6U VMEbus (VMEbus Rev B/C, not VME64)
CPU: Motorola MC68030 @ 20 MHz (fixed for MVME‑147A)
FPU: MC68882 @ 20 MHz
DRAM: 8 MB standard (no parity)
Application: Legacy industrial control, DCS/SIS, factory automation, original MVME‑147 upgrade, non‑VME64 systems
Key Note:
MVME‑147A = 20 MHz + 8 MB DRAM (no parity) + basic I/O + legacy VME
Not compatible with MVME147‑02x (33 MHz / VME64) series

1. General Description

The MVME‑147A is a legacy 6U VMEbus single‑board computer, designed as a pin‑compatible upgrade to the original Motorola MVME‑147. It uses the MC68030 32‑bit CPU @ 20 MHz (integrated MMU, 256‑byte unified instruction/data cache) and an MC68882 FPU @ 20 MHz for floating‑point operations. Onboard 8 MB DRAM (non‑parity) for general‑purpose embedded use. Peripherals include four EIA‑232‑D serial ports, a Centronics parallel port, asynchronous SCSI (WD33C93), and battery‑backed 4 KB SRAM/RTC. The VMEbus interface supports master/slave operation with A16/A24 addressing and D8/D16/D32 data widths. The “A” revision denotes minor PCB and component updates for improved reliability, while maintaining full hardware/software compatibility with the base MVME‑147.

2. Features

Processor & Memory

  • CPU: MC68030 @ 20 MHz, integrated MMU, 256‑byte unified cache

  • FPU: MC68882 @ 20 MHz, IEEE 754 compliant

  • DRAM: 8 MB, non‑parity

  • EPROM: 4 sockets, up to 4 MB total (16‑bit wide)

  • Battery‑Backed SRAM: 4 KB for non‑volatile data

  • RTC: Battery‑backed real‑time clock (calendar/clock)

Onboard I/O

  • Serial: 4 × EIA‑232‑D (Z8530 SCC)

  • Parallel: 1 × Centronics‑compatible printer port

  • SCSI: 1 × asynchronous SCSI (WD33C93, DMA capable)

  • Ethernet: Optional AUI 10 Mbps (Lance AM7990, via transition module)

VMEbus Interface

  • Address: A16/A24 (no A32)

  • Data: D08/D16/D32

  • Operation: Master/slave, system controller function

  • Compliance: VMEbus Rev B/C (not VME64)

System Functions

  • Timers: Dual 16‑bit timers

  • Watchdog: Hardware watchdog timer

  • LEDs: SCON, RUN, FAIL, STATUS

  • Switches: RESET, ABORT

3. Electrical Specifications

  • Power Supply: +5 VDC, ±12 VDC (VMEbus standard)

  • Current Draw: +5 V @ 6.0 A typical, 7.0 A max

  • Logic Levels: 5 V TTL compatible

  • Power Consumption: ~12 W typical

4. Mechanical Specifications

  • Form Factor: 6U VME

  • Dimensions: 233.4 mm × 160 mm (H × D)

  • Weight: ~800 g

  • Coating: Class 2 conformal coating (optional)

5. Environmental Specifications

  • Operating Temperature: 0 °C to +55 °C

  • Storage Temperature: −20 °C to +70 °C

  • Relative Humidity: 5%–95% RH, non‑condensing

  • Shock: 30 g (11 ms pulse)

  • Vibration: 5 g (5–200 Hz)

6. Supported Operating Systems

  • VxWorks (legacy versions)

  • Motorola VERSAdos

  • NetBSD/mvme68k

  • Custom embedded RTOS

  • Bare‑metal programs

7. MVME‑147 vs MVME‑147A

  • MVME‑147: Original 16 MHz, 4 MB DRAM, basic I/O

  • MVME‑147A: 20 MHz, 8 MB DRAM, improved I/O, Rev A PCB

  • Compatibility: 100% pin‑compatible, software‑compatible


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