🚀 go-pugleaf

In article <4ebcDni00WA71HOohT@andrew.cmu.edu> da0g+@andrew.cmu.edu (David  
Apfelbaum) writes:
[explanation of problem deleted]
> 
> The Questions:
>     After talking with the drive manufacturer extensively, they had the
> following questions about NeXT SCSI:
> 
>     1) Does the [SCSI interface] system allow disconnect during write?
>          (ie, Can it disconnect before going into the data phase?)

Yes. Disconnects are allowed on writes as well as reads -- it is up to the  
device to decide when to disconnect.  Disconnect messages sent by the  
device must be proceded by a SCSI "Save Data Pointer" message as specified  
by the SCSI spec for xfers that break a data phase into multiple parts.

>     2) What is the burst size that it transfers data at.  Does it have a  
set
>           burst size that it tries to transfer [send] blocks [data] at?

There is no set "burst size."  Disconnects may occur on arbitrary  
boundaries.

>     3) What is the name of the configuration file to change the mode  
select
>           of the drive?

There isn't one.  You need to get the drive properly configured from the  
vendor or configure it yourself.  If you know what you're doing, you can  
use the scsitools package from the archive sites to play with the drive's  
Mode Select pages.

M Carling
Director, Bay Area NeXT Group
--
"High tech is potent, precise, and in the end, unbeatable. The truth is,  
it reminds a lot of people of the way I pitch horseshoes. Would you  
believe some of the people? Would you believe our dog? Look, I want to  
give the high-five signal to high tech."
                          George Bush, 4/25/89