SCSI Mass Storage Interface The MVME187 provides for mass storage subsystems through the industry-standard SCSI bus. These subsystems may include
❏ Hard and floppy disk drives
❏ Streaming tape drives
❏ Other mass storage devices.
All four serial ports use EIA-232-D drivers and receivers located on the main board, and all the signal lines are routed to the I/O connector.
Parallel (Printer) Port
The 8-bit bidirectional parallel port may be used as a Centronicscompatible parallel printer port or as a general parallel I/O port. A functional description of the Parallel Port Interface starts on page 2-20. Ethernet Transceiver Interface The Ethernet transceiver interface is located on the MVME187, and the industry standard connector is located on the MVME712X transition module.
187Bug Firmware
The MVME187Bug debug monitor firmware (187Bug) is provided in two of the four EPROM sockets on the MVME187. It provides:
❏ Over 50 debug commands
❏ Up/down load commands
❏ Disk bootstrap load commands
❏ A full set of onboard diagnostics
❏ A one-line assembler/disassembler The 187Bug user interface accepts commands from the system console terminal. 187Bug can also operate in a System Mode, which includes choices from a service menu.
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