MVME148 6U VME Single‑Board Computer (SBC) Motorola / Emerson / Curtiss‑Wright User Manual (Plain Text, No Images) Part Number: MVME148 Manufacturer: Motorola, later Emerson / Artesyn / Curtiss‑Wright Form Factor: 6U VMEbus (VMEbus Rev C, VME64 compatible, P1/P2 backplane) CPU: Motorola MC68030 @ 16 MHz FPU: None (no floating‑point coprocessor) DRAM: 4 MB, no parity Ethernet: Onboard 10 Mbps AUI Ethernet Application: Cost‑sensitive industrial control, real‑time embedded systems, factory automation, networked but non‑FPU applications Key Identification: MVME148 = 16 MHz MC68030, 4 MB non‑parity DRAM, no FPU, onboard Ethernet, SCSI, four serial ports, VME64 It is similar to MVME147SRF but adds Ethernet and removes FPU. 1. General Description The MVME148 is a low‑cost 6U VMEbus single‑board computer, designed for industrial and embedded applications that require network connectivity but do not need floating‑point arithmetic. It is based on the Motorola MC68030 32‑bit microprocessor operating at 16 MHz, with integrated MMU and 256‑byte unified instruction/data cache. No MC68882 FPU is installed. Onboard memory includes 4 MB of DRAM without parity, 2 KB of battery‑backed CMOS SRAM for non‑volatile data storage, and a battery‑backed real‑time clock (RTC). Four 32‑pin ROM/EPROM/EEPROM sockets support up to 4 MB of boot and firmware storage. Peripheral interfaces comprise four EIA‑232‑D serial ports, a Centronics‑compatible parallel printer port, an asynchronous SCSI controller with DMA, and an onboard Lance AM7990 10 Mbps AUI Ethernet controller. The VMEbus interface supports A16/A24/A32 addressing and D08/D16/D32 data widths, with master/slave operation and system controller functions. The MVME148 complies with VMEbus Rev C and is VME64 compatible. 2. Features Processor and Memory Processor: MC68030 at 16 MHz, integrated MMU, 256‑byte unified cache Floating‑point coprocessor: Not installed (no FPU) DRAM: 4 MB, no parity Battery‑backed CMOS SRAM: 2 KB Real‑time clock: Time‑of‑day clock/calendar with battery backup ROM sockets: four 32‑pin sockets, 16‑bit wide, up to 4 MB total Onboard I/O Interfaces Serial ports: four EIA‑232‑D asynchronous/synchronous ports (Z8530 SCC) Parallel port: Centronics‑compatible printer port SCSI interface: WD33C93 asynchronous SCSI with DMA Ethernet: Lance AM7990, 10 Mbps AUI (onboard) VMEbus Interface Addressing modes: A16, A24, A32 Data widths: D08, D16, D32 Bus operation: master, slave, system controller Compliance: VMEbus Rev C, VME64 compatible System Functions Timers: two 16‑bit programmable tick timers Watchdog: hardware watchdog timer with reset capability Front panel LEDs: SCON, RUN, FAIL, STATUS Switches: RESET, ABORT 3. Electrical Specifications Power supply: +5 VDC, ±12 VDC (VMEbus standard) Current consumption: +5 V at 5.5 A typical, 6.5 A maximum +12 V: 100 mA maximum -12 V: 100 mA maximum Logic levels: 5 V TTL compatible Power dissipation: approximately 10 W typical 4. Mechanical Specifications Form factor: 6U VME Dimensions: 233.4 mm height × 160 mm depth Weight: approximately 750 g Conformal coating: Class 2 (industrial standard) 5. Environmental Specifications Operating temperature: 0 °C to +55 °C Storage temperature: −20 °C to +70 °C Relative humidity: 5% to 95% non‑condensing Shock: 30 g, 11 ms pulse Vibration: 5 g, 5 Hz to 200 Hz 6. Supported Operating Systems VxWorks (legacy 68k versions, no FPU support required) Motorola VERSAdos NetBSD/mvme68k Custom embedded RTOS Bare‑metal application programs 7. Compatibility Notes MVME148 is pin‑compatible with MVME147S series boards (MVME147SRF/SA‑1) It is software‑compatible with MVME‑147 / MVME‑147A but no FPU, 16 MHz, 4 MB non‑parity, Ethernet present Not compatible with MVME147‑02x (33 MHz, different hardware)