
B |
Debugger General Information
The device probe mechanism utilizes the SCSI commands ÒInquiryÓ and ÒMode SenseÓ. If the specified controller is
Disk I/O via 177Bug Commands
The 177Bug commands listed in the following paragraphs are provided for disk I/O. Detailed instructions for their use are found in the Debugging Package for Motorola 68K CISC CPUs User's Manual. When a command is issued to a particular controller LUN and device LUN, these LUNs are remembered by 177Bug so that the next disk command defaults to use the same controller and device.
IOI (Input/Output Inquiry)
This command probes the system for all possible CLUN/DLUN combinations and displays inquiry data for devices which support it. The device descriptor table has space for a maximum of 16 device descriptors. Use the IOI command to view the table or clear it if necessary.
IOP (Physical I/O to Disk)
IOP allows you to:
❏Read blocks of data
❏Write blocks of data
❏Format a specified device in a certain way
IOP creates a command packet from the arguments you have specified, then invokes the proper system call function to carry out the operation.