HP 27140A Hardware Reference Manual page 3

Asynchronous 6-channel multiplexer (with modem control)
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Printing History
New editions are complete revisions of the manual. Update packages,
which are issued between editions, contain additional and replacement
pages to be merged into the manual by the customer. The dates on the
title page change only when a new edition or a new update is published.
No information is incorporated into a reprinting unless it appears as a
prior update; the edition does not change when an update is incorporated.
A software code may be printed before the date; this indicates the version
level of the software product at the time the manual or update was issued.
Many product updates and fIXes do not require manual changes and, con-
versely, manual corrections may be done without accompanying product
changes. Therefore, do not expect a one-to-one correspondence between
product updates and manual updates.
Edition 1 . . . . . . . . . . . . . . . . . . . . . . . . . . June 1988
Update 1
. . . . . . . . . . . . . . . . . . . . . . October 1988
3

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