DVT Command

Purpose:

The device table (DVT) command sets up a table containing information

 

specific to a particular device, including the logical unit number.

 

One DVT command is required for each device connected to the same

 

interface card. These DVT commands must be entered immediately following

 

the IFT entry.

Syntax:

DVT,[file],[Mmodel],LU:lu[,Eentry point][,TO:to]

 

[,BL:bb:ll:ul][,DT:dt][,TX:tx][,DX:dx]

 

[,DP:start #:a:b:c:d:e][,PR:pr][,QU:qu]

 

To enhance readability, it is suggested that continuation lines (usable in the

 

DVT command and NODE command) be used. Continuation lines are

 

indicated by a dash (-) immediately following one of the commas in the

 

normal DVT command string. Note that both the file and the model number

 

parameter, with a comma place holder, must occur in the line containing the

 

DVT command before the `-' indicating a continuation line. The command is

 

continued on the next noncomment line in the command file. Note that an

 

extra comma is not required to start the new line. The DVT command may be

 

broken only where commas normally occur, never at colons. If continuation

 

lines are used, the DVT command using all the options would be as follows:

 

DVT,[file],[Mmodel #],–

 

LU:lu,–

 

[Eentry point],–

 

[TO:to],–

 

[BL:bb:ll:ul],–

 

[DT:dt],–

 

[TX:tx],–

 

[DX:dx],–

 

[DP:start #:a:b:c:d:e],–

 

[PR:pr],–

 

[QU:qu]

file

specifies the file that contains the DVT parameter default values for a specific

 

device. It may be omitted if the default values are not needed. (This may be

 

the case if no device driver is to be used with a particular device. In that case

 

the interface driver will have to handle any I/O to the device.) If omitted, its

 

place must be held by a comma.

 

This parameter is usually the name of the file that contains the relocatable

 

driver code for this device, but it may be any userdefined file that contains only

 

the DVT parameter defaults.

 

Specifying the default file name here does not relocate the file as part of the

 

operating system. The driver required for the device operation must be

 

relocated during the system relocation phase of generation.

Table Generation Phase 613