BENTLY 3500/13 Channel relay module

The IOT command allows you to "teach" a new disk configuration to 16XBug for use by the TRAP #15 disk functions. IOT lets you modify the controller and device descriptor tables used by the TRAP #15 functions for disk access. Note that because the 16XBug commands that access the disk use the TRAP #15 disk functions, changes in the descriptor tables affect all those commands. These commands include IOP, BO, BH, and also any user program that uses the TRAP #15 disk functions.Before attempting to access the disks with the IOP command, you should verify the parameters and, if necessary, modify them for the specific media and drives used in the system. Note that during a boot, the configuration sector is normally read from the disk, and the device descriptor table for the LUN used is modified accordingly. If you wish to read/write using IOP from a disk that has been booted, IOT will not be required, unless the system is reset.

A device probe with entry into the device descriptor table

 is done whenever a specified device is accessed via IOT. The device probe mechanism utilizes the SCSI commands "Inquiry" and "Mode Sense". If the specified controller is non-SCSI, the probe simply returns a status of "device present and unknown". The device probe makes an entry into the device descriptor table with the pertinent data. After an entry has been made, the next time a probe is done it simply returns with "device present" status (pointer to the device descriptor). When invoked without options, the IOT command enters an interactive subcommand mode where the descriptor table values currently in effect are displayed one-at-a-time on the console for you to examine. You may change the displayed value by entering a new value or may leave it unchanged by typing only a carriage return

The same special characters

 used by the Memory Modify (MM) command to access the next successive memory location (v or V), a previous field (^), reopen the same location (=), or exit (.), can be used with IOT. All numerical values are interpreted as hexadecimal numbers. Decimal values may be entered by preceding the number with an "&". The first two items of information for which you are prompted are the Controller LUN and Device LUN (LUN = Logical Unit Number). These two LUNs specify one particular drive out of many that may be present in the system.

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