420

The 420 is a high-performance repeater for VMEbus systems. The repeater extends a VME backplane from one chassis to a second VMEbus chassis. Both chassis operate as though they were one unit, controlled by the system controller in the primary chassis. The primary chassis can operate as a stand-alone system; it does not require the secondary chassis. The secondary chassis does not have a system controller; consequently, it cannot operate without the primary chassis. The repeater includes an optional software controlled enable/disable function. A write to the repeater I/O register switches the repeater on or off. The enable/disable feature can be disabled by a jumper so that the repeater does not use any I/O addresses and its operation is transparent to the VME systems.

• Includes two 6U size VMEbus repeater cards
• Enable/disable function under program control
• Bus masters and slaves can reside in either the primary or the secondary chassis
• Supports VME64 and VME32