[net.unix-wizards] Unix layers- using /dev/sxt

djc@wlcrjs.UUCP (David J. Carpenter) (07/03/85)

How does one really use the /dev/sxt--- devices on an AT&T 3b2 Unix 5.2?
There is a progrsm shl, shell layer manager, that lets you have multiple
shells all spewing forth at once, but how do you separate the output into
windows, for example, at the terminal?  Is the device driver in there
incapable of this right now?  Do you have to write one? (or modify it)
The manual makes little mention of this.

Thanks...  ..!ihnp4!wlcrjs!djc

mcferrin@inuxc.UUCP (P McFerrin) (07/04/85)

> How does one really use the /dev/sxt--- devices on an AT&T 3b2 Unix 5.2?
> There is a progrsm shl, shell layer manager, that lets you have multiple
> shells all spewing forth at once, but how do you separate the output into
> windows, for example, at the terminal?  Is the device driver in there
> incapable of this right now?  Do you have to write one? (or modify it)
> The manual makes little mention of this.
> 
> Thanks...  ..!ihnp4!wlcrjs!djc

The output can not be separated.  However, there is a shl command to cause
the output to be blocked to your terminal when you leave that layer (e.g.
switch to another layer).  A shl status command is available to inquire
about the status of other running layers which will indicate if it is
blocked on output.

If you really want multiple windows, there is the DMD layers software
which might not be available for the 3b2.

robert@gitpyr.UUCP (Robert Viduya) (07/05/85)

> > How does one really use the /dev/sxt--- devices on an AT&T 3b2 Unix 5.2?
> > There is a progrsm shl, shell layer manager, that lets you have multiple
> > shells all spewing forth at once, but how do you separate the output into
> > windows, for example, at the terminal?  Is the device driver in there
> > incapable of this right now?  Do you have to write one? (or modify it)
> > The manual makes little mention of this.
> > 
> 
> If you really want multiple windows, there is the DMD layers software
> which might not be available for the 3b2.

The DMD layers software is available for the 3B2.  The software handles
all the output seperation by wrapping all data sent from and to the
terminal in a multiplexing type protocol.  The DMD terminal, unlike
most other terminals, is smart enough to handle this.  

			robert
-- 
Robert Viduya							01111000
Georgia Institute of Technology

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