BENTLY 3500/11 interface module

The IOP command allows you to read, write, or format any of the supported disk or tape devices. When invoked, this command goes into an interactive mode, prompting you for all the parameters necessary to carry out the command. You may change the displayed value by typing a new value followed by a carriage return; or may simply enter, which leaves the field unchanged. The same special characters used by the Memory Modify (MM) command to access the next successive memory location (v or V), previous field (^), reopen the same location (=), or exit (.), can be used with IOP. After IOP has prompted you for the last parameter, the selected function is executed. The disk SYSCALL functions (trap routines), as described in Chapter 5, are used by IOP to access the specified disk or tape. 

A device probe with entry 

into the device descriptor table is done whenever a specified device is accessed via IOP. 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). Initially (after a cold reset), all the parameters used by IOP are set to certain default values. However, any new values entered are saved and are displayed the next time that the IOP command is invoked.

In this field

 you specify the desired function by entering a onecharacter mnemonic as follows: 1. R for read. This reads blocks of data from the selected device into memory. 2. W for write. This writes blocks of data from memory to the selected device. 3. F for format. This formats the selected device. For disk devices, either a track or the whole disk can be selected by a subsequent field. This option only applies to SCSI Direct Access devices (type $00). When the format operation is selected, the Flag Byte prompt is displayed. A flag byte of $08 specifies to ignore the grown defect list when formatting. A flag byte of $00 specifies not to ignore the grown defect list when formatting.

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