BENTLY 3500/12 Monitor Module

This field selects the starting address for the block to be accessed. For disk read operations, data is written starting at this location. For disk write operations, data is read starting at this location This parameter specifies the starting disk block number to access. For disk read operations, data is read starting at this block. For disk write operations, data is written starting at this block. For disk track format operations, the track that contains this block is formatted.This field contains the VMEbus address modifier to use for Direct Memory Access (DMA) data transfers by the selected controller. If zero is specified, a valid default value is selected by the driver. If a nonzero value is specified, then it is used by the driver for data transfers.

The flag byte is used to specify

 variations of the same command, and to receive special status information. Bits 0 through 3 are used as command bits; bits 4 through 7 are used as status bits. At the present, only streaming tape devices use this field. The following bits are defined for streaming tape read and write operations: Bit 7 Filemark flag. If 1, a filemark was detected at the end of the last operation. Bit 3 This bit is used for disk formatting. It is ignored on tape operations. Bit 2 Reset Controller Flag. If 1, a controller reset will take place if possible before the requested operation takes place.Ignore File Number (IFN) flag. If 0, the file number field is used to position the tape before any reads or writes are done. If 1, the file number field is ignored, and reads or writes start at the present tape position.

For streaming tape devices

this field indicates whether a retension of the tape or an erase should be done when a format operation is scheduled. Retension: This rewinds the tape to BOT, advances the tape without interruptions to EOT, and then rewinds it back to BOT. Tape retension is recommended by cartridge tape suppliers before writing or reading data when a cartridge has been subjected to a change in environment or a physical shock, has been stored for a prolonged period of time or at extreme temperature, or has been previously used in a start/stop mode. Erase This completely clears the tape of previous data and at the same time retensions the tape. After all the required parameters are entered, the disk access is initiated. If an error occurs, an error status word is displayed. Refer to Appendix F for an explanation of returned error status codes.

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