SST SST-PFB-CLX-RLL Signal input card

The clock speed of the microprocessor is calculated and checked against a user definable parameter contained in NVRAM (refer to the CNFG command in Appendix A). If the check fails, a warning message is displayed.

Disk Support Facilities Disk support facilities built into 187Bug consist of the following: 

❏ Command-level disk operations 

❏ Disk I/O system calls (only via one of the TRAP #496 instructions) for use by user programs 

❏ Defined data structures for disk parameters

Disk I/O Support 

187Bug can initiate disk input/output by communicating with intelligent disk controller modules over the VMEbus. This section covers: ❏ Blocks Versus Sectors 

❏ Device Probe Function 

❏ Disk I/O via 187Bug Commands 

❏ Disk I/O via 187Bug System Calls 

❏ Default 187Bug Controller and Device Parameters 

❏ Disk I/O Error Codes

Parameter Tables 

Parameters such as the address where the module is mapped and the type and number of devices attached to the controller module are kept in tables by 187Bug. Default values for these parameters are assigned at powerup and cold-start reset, but may be altered as described in the section on default parameters, later in this chapter. Supported Controllers Appendix B contains a list of the controllers presently supported, as well as a list of the default configurations for each controller

                                                         

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