The earliest generation, the 3420-07, used the virtualized lights. I
think it was really old vacuum tubes from the 30 minute rewind time.
They had to warm up before there was enough light to be detected. ;-)
The newest generation is said to be a 3490. However, its responses to
SenseId and RDC make it appear to be a 3480-04.
Regards,
Richard Schuh
________________________________
From: The IBM z/VM Operating System
[mailto:[EMAIL PROTECTED] On Behalf Of Mike Walter
Sent: Wednesday, July 23, 2008 9:02 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Interpreting Trace
But Sir Rob the Plumber, even the old 3420 drives had internal
incandescent lights in the tape path to shine on the reflector. No need
for external light to reflect on the strip!
One might only presume that the hardware manufacturer of this
pseudo virtualized tape drive has installed virtualized LEDs (using less
virtualized electricity than old-fashioned virtualized incandescent
bulbs, important in this "green" day and age) to shine on a virtualized
reflector strip? ;-)
But that of course begs the question of whether this virtualized
tape drive might have problems with their virtualized vacuum columns
(for which some manufacturers used light bulbs to detect tape location,
too!)?
Or... didn't Richard say way back at the beginning of the thread
that this was a virtualized 3490? Never mind! :-)
Mike Walter
Hewitt Associates
Any opinions expressed herein are mine alone and do not
necessarily represent the opinions or policies of Hewitt Associates.
"Rob van der Heij" <[EMAIL PROTECTED]>
Sent by: "The IBM z/VM Operating System" <IBMVM@LISTSERV.UARK.EDU>
07/23/2008 10:47 AM
Please respond to
"The IBM z/VM Operating System" <IBMVM@LISTSERV.UARK.EDU>
To
IBMVM@LISTSERV.UARK.EDU
cc
Subject
Re: Interpreting Trace
On Wed, Jul 23, 2008 at 5:33 PM, Mike Walter
<[EMAIL PROTECTED]> wrote:
> Say... could it be that the virtualized silver tape reflector
fell off the
> beginning or end of the virtualized tape? And are you sure
that the
> virtualized silver tape reflector is on opposite edges of the
shiny surface
> of the virtualized tape media? I can't remember which edge
gets the leading
> and trailing silver tape reflectors. You'll have to ask your
hardware
> supplier to experiment with opposite edges. ;-)
But Sir Mike! The modern 3480 cartridge does not do shiny bits
anymore. After all, the cartridge is closed so there is no light
that
will go in to shine ;-) The control unit is smart enough to
count the
operations that move the tape, and indeed... virtualizes BOT.
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