The Emerson/Mizar 8115 is a 3U x 160mm VMEbus CPU module engineered for industrial and embedded systems requiring master-level bus control. Built around a 68000 or 68010 processor, this module delivers complete VMEbus arbitration and interrupt handling capabilities with integrated memory and expansion flexibility for custom applications.
## Technical Specifications
**Processor & Clock Speed**
• 68000 or 68010 processor operating at 10 MHz and 12.5 MHz with zero wait states
**Memory Architecture**
• 512KB dual-ported dynamic RAM accessible from onboard system and any VMEbus master
• RAM address mapping: $0000 to $07FEFF (onboard), $E80000 to $EFFFFF (off-board via PAL reconfiguration)
• Two EPROM sockets support 2764, 27128, 27256, or 27512 devices for up to 128KB total capacity
• ROM base address: $F80000; initial stack pointer at $F80000, program counter at $F80004
**VMEbus Interface**
• 3U x 160mm form factor; P1 connector installation only (P2 installation causes damage)
• Full VMEbus master with configurable interrupt response to all seven VMEbus interrupt levels plus onboard interrupts
• Dual BIRQ1 & BIRQ2 signal lines for VMEbus interrupt requests IRQ1–IRQ7
## Key Features
• MXbus connector (S1) supports custom expansion with full address, data, and interrupt line access
• Configurable PAL-based memory address selection
• Interrupt handler responds to any combination of VME or onboard interrupt sources
• P2 connector access to upper address/data lines and user-defined signals on expanded boards
## Typical Applications
• Serial or parallel port expansion
• Floppy disk controller integration
• Additional memory modules
• Custom industrial automation and embedded control systems
## Compatibility & Integration
Direct compatibility with Mizar MZ 8800 Series MXbus expansion modules via S1 connector. Module design supports straightforward customization to full 6U x 160mm configuration.
