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Disk I/O Support
167Bug can initiate disk input/output by communicating with
intelligent disk controller modules over the VMEbus.
This section covers:
Disk Support Facilities
Disk support facilities built into 167Bug consist of
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 167Bug. 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.
Blocks Versus Sectors
Device Probe Function
Disk I/O via 167Bug Commands
Disk I/O via 167Bug System Calls
Default 167Bug Controller and Device Parameters
Disk I/O Error Codes
Command-level disk operations
Disk I/O system calls (only via one of the TRAP #15
instructions) for use by user programs
Defined data structures for disk parameters.
Disk I/O Support
4-13
4
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