Description
Product Overview
The Motorola MVME761-001 is a VME transition module designed to expose and organize peripheral interfaces from compatible Motorola VME single-board computers. It is not a CPU or independent controller. Instead, the board sits at the rear of the VME system and provides standard external connectors for serial, Ethernet, parallel, and related signals originating from the processor board. Motorola documentation identifies the MVME761-001 as the three-row P2-adapter version of the MVME761 family.
For engineers maintaining older VME installations, the Motorola MVME761-001 is particularly useful because it converts otherwise inconvenient backplane-side signals into practical field connections. The module provides two EIA-574 asynchronous serial ports and two additional asynchronous/synchronous serial ports that can be configured for EIA-232-D, EIA-530, V.35, or X.21 through the appropriate serial interface modules. A parallel interface compliant with IEEE 1284-I and a 10Base-T/100Base-TX Ethernet connection are also provided.
The Motorola MVME761-001 is associated with Motorola MVME260x, MVME270x, MVME360x, and MVME460x processor families. Its three-row DIN P2 adapter also carries 8-bit SCSI signals, making the exact P2/backplane arrangement important when replacing the module. The related MVME761-011 uses a five-row P2 adapter for 16-bit SCSI applications, so those two variants should not be treated as interchangeable simply because their transition-board functions look similar.
A useful maintenance point: the MVME761-001 does not provide the processing capability of the host MVME CPU. It is an interface/transition board. If a legacy VME computer is experiencing Ethernet or serial communication faults, checking the processor board, P2 adapter, transition-board cabling, and external interface modules as a complete path is more productive than replacing the transition board blindly.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | |
| Manufacturer | Motorola |
| Product Type | VME Transition / Rear I/O Module |
| Series | MVME761 |
| Host Systems | MVME260x, MVME270x, MVME360x, MVME460x |
| Form Factor | Single-width VME transition module |
| P2 Adapter | Three-row DIN P2 |
| Async Serial Ports | 2 × EIA-574 |
| Sync/Async Serial Ports | 2 × configurable interfaces |
| Supported Serial Standards | EIA-232-D, EIA-530, V.35, X.21 |
| Parallel Interface | 1 × IEEE 1284-I |
| Ethernet | 1 × 10Base-T/100Base-TX |
| Ethernet Connector | RJ-45 |
| Async Serial Connectors | DB-9 |
| Sync/Async Connectors | HD-26 |
| Parallel Connector | HD-36 |
| SCSI Support | 8-bit SCSI through three-row P2 arrangement |
| SIM Interfaces | 2 × 60-pin Serial Interface Module connectors |
| Installation | Rear VME chassis / transition position |
| Operating Temperature | 0°C to +55°C, depending on system cooling |
| EMI/ESD Protection | Provided |
| Power Source | Derived from the VME system/backplane |
The interface and compatibility information above is supported by the Motorola installation documentation and MVME5100 documentation.
MVME761-001
Related Products
- Motorola -011 — Similar transition module using a five-row DIN P2 adapter. It is intended for 16-bit SCSI configurations and requires the appropriate five-row backplane.
- Motorola MVME761P2-001 — Three-row P2 adapter associatethe . It provides the physical interface between the transition module and compatible VME processor system.
- Motorola MVME761P2-011 — Five-row P2 adapter for the -011 transition-module configuration. It is applicable where wider SCSI and compatible VME64 backplane arrangements are required.
- Motorola IPMC761-001 — Multifunction rear-I/O PMC module compatible with the ecosystem, providing serial, parallel, and SCSI-related functions on supported processor boards.
- Motorola MVME2700 — VME processor family that can use the transition module for external I/O access. The processor executes the application; the handles rear-interface connectivity.
- Motorola MVME5100 Series — Later VME processor platform documented with -compatible I/O opThe provides two DB-9 serial ports, two HD-26 serial interfaces, HD-36 parallel, and RJ-45 Ethernet.
- Motorola SIM232DCE / SIM232DTE — Serial interface modules used to configure supported synchronous/asynchronous serial channels for EIA-232 operation.
- Motorola SIM530DCE / SIM530DTE — Interface modules for EIA-530 serial configurations on the applicable ports.
Frequently Asked Questions (FAQ)
1. What is thola used for?
The is a rear transition module for compatible Motorola VME processor boards. Its main purpose is to bring processor-board I/O signals to accessible external connectors.
It provides:
- Two asynchronous serial ports
- Two configurable synchronous/asynchronous serial ports
- 10/100 Ethernet
- IEEE 1284 parallel interface
- 8-bit SCSI connectivity through the three-row P2 arrangement
2. Can I an with an -011?
Not as a blind substitution.
The major difference is the P2 arrangement:
- Three-row DIN P2, associated with 8-bit SCSI
- Five-row DIN P2, associated with 16-bit SCSI
The backplane and processor configuration must match the selected transition module.
3. Can I hothe ?
Do not assume hot-swapping is permitted merely because the module is a transition board. It is connected to the VME system’s rear I/O architecture and may carry active signals.
For maintenance, verify:
- System shutdown requirements.
- Backplane power isolation.
- Cable identification.
- P2 adapter orientation.
- External device connections.
Follow the installed VME system’s maintenance procedure.
4the have its own CPU or application firmware?
No. It is an I/O transition module rather than the primary VME processor.
The application processor resides on the compatible MVME single-board comThe primarily routes the processor board’s peripheral signals to external connectors.
5. Which processor boards are compaith ?
Motorola documentation identifies compatibility with MVME260x, MVME270x, MVME360x, and MVME460x VME processor families. Later documentation also lists the as a compatible I/O option for the MVME5100 family.
Still, the exact processor model and P2 configuration should be checked before replacement.
6. Can the serial ports be configured for EIA-232, EIA-530, V.35, or X.21?
Yes, the two synchronous/asynchronous serial interfaces support these standards when the appropriate Serial Interface Module configuration is installed. The two EIA-574 asynchronous ports are separate fixed interfaces.
7. What should I verify before purchasing a Nlus ?
For a field replacement, verify the following:
- Full part number:
- Three-row P2 adapter
- Included P2 cable/adapter hardware
- Connector condition
- Serial interface configuration
- SCSI termination configuration
- Compatibility with the installed MVME processor
- Functional test results for Ethernet and serial interfaces
The P2 adapter is not a minor accessory here; it is part of the interface architecture, so missing or mismatched adapter hardware can turn an apparently correct replacement into a commissioning problem.
