RELIANCE 45C994 I/O bus card

Be sure that the two factory installed 128K x 16 187Bug EPROMs are in the proper sockets. EPROM Location ❏ Odd-numbered label (such as B01): EPROM in socket XU1 (for Least Significant Half-Words) ❏ Even-numbered label (such as B02): EPROM in XU2 (for Most Significant Half-Words) EPROM Orientation Be sure that physical chip orientation is correct: ❏ The flatted corner of each EPROM aligns with the corresponding portion of the EPROM socket on the MVME187. User-programmed EPROMs There are two spare EPROM sockets, XU3 and XU4, available to carry user-programmed EPROM

The MVME187 has been factory tested and is shipped with the factory jumper settings described on the following pages. The MVME187 operates with its required and factory-installed Debug Monitor, 187Bug, with these factory jumper settings.

Optional Jumper Settings 

Most of the optional functions on your board can be changed through software control or bit settings in control registers. If your installation requires it, however, you may change jumper settings on the following headers: 

❏ Jumper pins 9 through 16 on header J1 are general purpose software readable jumpers open to your application. 

❏ Header J2 enables/disables the MVME187 as system controller. 

❏ Optional header J6 selects the SRAM backup power source (this is only available as an optional factory build special request). 

❏ Headers J7 and J8 select serial port 4 to drive or receive TRXC4 and RTXC4 clock signals.

Bit Descriptions

When this bit is a one (high), it instructs the debugger to use local Static RAM for its work page (i.e., variables, stack, vector tables, etc.). This bit will be high when jumper is removed. Bit #1 (GPI1) 3-4 When this bit is a one (high), it instructs the debugger to use the default setup/operation parameters in ROM versus the user setup/operation parameters in NVRAM. This is the same as depressing the RESET and ABORT switches at the same time. This feature can be used in the event the user setup is corrupted or does not meet a sanity check. Refer to the ENV command (Appendix A) for the ROM defaults. This bit will be high when jumper is removed

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