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A friend of mine asked me to forward this answer to Unix-Wizards...

Date: 10 May 1986 23:01:69-CDT
From: Suzie%SWAPPED@FULL.DEC
Subject: Re: help me with my device driver

> From: dragonpup <dwaagon%sdcc6.uucp@BRL.ARPA>
> Subject: help me with my device driver
> Date: 6 May 86 05:48:16 GMT
> Keywords: please, please, please
> To:       unix-wizards@brl-sem.arpa

> i have this problem see,
> i'm futility trying to write this driver for
> /dev/clit for our System V machine (i realize that this comes
> with a BSD version)
> every time i try to load it up, the buffers seem to overflow
> and alot of our circuits seem to be erroding from this.
> is this a problem with "bucket" size ?
> i hope someone out there can straigthen this out.

Writing your own driver for this device is not an easy task.  The VMS
code for it is in fact very hairy.  I suggest you find the
/dev/vibrator tool as this can be a useful aid when noone is around to
help and is much better for testing purposes than /dev/nul.  Also you
should avoid any pubic domain versions of the driver, as these may
contain the Acquired Incorrect Device Syndrome which will destroy any
unprotected system.  To avoid the buffer overflow problem I suggest
you skip using buffers and access the device as quickly as possible.

Let me know if you'd like some help testing the code.
Suzie.