Motorola MVME300 VME Module (Two Versions: Official GPIB Controller & Mislabeled 68040 SBC)

Manufacturer: Motorola Computer Group (later Emerson)

Model: MVME300

Two Distinct Versions: 1. Official Original MVME300: VME-to-GPIB IEEE488 Slave Interface Card 2. Mislabeled Market Version: MC68040 VME Single Board Computer (Unofficial Name)

1. Official Standard MVME300 (GPIB Instrument Controller)

This is the genuine factory-defined MVME300, a 6U single-slot VMEbus slave module implementing IEEE-488 GPIB/HPIB protocol conversion. It offloads instrument communication timing tasks from main VME SBCs (MVME162 series), supporting DMA block data transfer and up to 15 connected test instruments. • Form Factor: 6U single-width VMEbus Rev C.1, A24/D8/D16 slave • Standard: IEEE-488-1978 full Talker/Listener/Controller • Transfer: DMA & Programmed I/O • Operating Temp: 0℃ ~ +55℃ forced air cooling • Application: Automated Test Equipment (ATE), aerospace telemetry, RF lab instrument control, not native DCS CPU board.

2. Market Mislabeled MVME300 (68040 VME SBC)

Many industrial spare parts vendors misname this MC68040 single board computer as MVME300; Motorola never released this SBC under official MVME300 part number. It shares similar architecture with MVME162 series, used for legacy Honeywell TDC3000 LCN operator station replacement. • CPU: MC68040 25MHz with integrated FPU • Memory: 4MB parity DRAM, 4MB onboard Flash • Interfaces: Dual RS232/422 serial, 10Mbps Ethernet, narrow SCSI, dual PCMCIA slots • Temp range: -40℃ ~ +85℃ industrial wide temperature • Supported OS: VxWorks, embedded Linux • Form Factor: Single-height 6U VMEbus master board.

3. Key Difference vs MVME162 Series

1. Genuine MVME300: Pure GPIB interface board without main CPU, only for instrument expansion. 2. Mislabeled MVME300: SBC host board, unofficial naming, alternative to MVME162 high-end models. 3. MVME162 full series: Official Motorola VME CPU SBC lineup, standard native controller for Honeywell TDC3000 DCS.