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(default). These characters are initialized to ^S and ^Q respectively
by 177Bug, but you may change them with the PF command. In the
initialized (default) mode, operation is as follows:
^S
^Q
Disk I/O Support
177Bug can initiate disk input/output by communicating with
intelligent disk controller modules over the VMEbus. Disk support
facilities built into 177Bug consist of:
Parameters such as:
are kept in tables by 177Bug. Default values for these parameters
are assigned at power-up and cold-start reset, but may be altered as
described in the section on default parameters, later in this chapter.
Blocks Versus Sectors
The logical block defines the unit of information for disk devices. A
disk is viewed by 177Bug as a storage area divided into logical
blocks. By default, the logical block size is set to 256 bytes for every
block device in the system. You can change the block size on a per
device basis with the IOT command.
(wait)
Console output is halted.
(resume) Console output is resumed.
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
Address where the module is mapped
Device type
Number of devices attached to the controller module
Disk I/O Support
B-13
B
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