Appendix B
Internal Connections
This appendix describes the RAM, VRAM, cache and I/O features
of the Genesis MP and the interfaces for internal I/O devices.
Follow these guidelines when handling, disconnecting, or connect-
ing the system:
• When connecting or disconnecting a cable, always hold the
cable by its connector (the plug, not the cord).
• Always turn off the system and all of its components prior to
connecting or disconnecting any cables or when adding or
removing any component. Failure to do so could seriously
damage these assemblies and/or the system. Additionally,
electric currents can cause damage to oneself or even loss
of life.
• Never force a connector into a port. If the connector and port
do not join with ease, they may not match, or may be in need
of repair. Ensure the connector matches the port and that the
connector is correctly aligned to its pin assignments. Also
check to ensure that none of the pins are bent.
The Internal SCSI Bus
The internal SCSI bus is terminated by a 110
Ω
passive terminator.
This terminator is located on the main logic board near the internal
chassis connector (contains signals for internal CD-ROM drive).
The internal CD-ROM drive does not include a terminator, but the
hard drive does include the termination for the end of the bus.
For pinouts on internal SCSI connectors, see the table SCSI
Connector Pin Assignments in Appendix A.
Internal Hard Disk Drive
Genesis MP has one internal hard disk drive. This drive is con-
nected to the internal SCSI hard disk connector.
The internal end of the SCSI bus is terminated by a 110
Ω
passive
terminator. This terminator is located on the main logic board near
the portion of the internal chassis connector which contains the
signals for the internal CD-ROM drive. The internal CD-ROM does
not include a terminator.
Genesis MP
Appendix B
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