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Model 8901B
Instrument Changes
Section 7
INSTRUMENT CHANGES
7-1. INTRODUCTION TO THIS SECTION
This section contains instrument modification recommendations and procedures that could improve
the performance and reliability of your instrument. Refer
to Instruments Covered
by This Manual,
paragraph 1-5 in Section
1
for important information about serial number coverage.
7-2. FIRMWARE CHANGE SUMMARY
(23144
TO
2644A)
Description
The instrument has undergone several changes in firmware. This article summarizes the changes and
should be helpful in deciding whether to update firmware to a more recent edition.
The firmware is changed whenever anomalies are found in the instrument's operation which can be
corrected by altering the Controller's program. Firmware is also changed to add new features which
may be only changes in the program or which may also result from instrument hardware changes.
Since the program resides in the ROMs (the firmware), the ROMs are altered each time the program
is changed. At that time the new ROMs are given new part numbers and the software (the program)
date is changed. (To display the software date, key in Special knction 42.0.) Always update firmware
with the latest edition, which is backward compatible. (See Service Sheet 24 for ROM identification.)
Summary of Software Editions
1. Software date code: 167.1983
(23144 to 2333A)
ROM part numbers:
ROM 1,08901-80062
ROM
2, 08901-80063
ROM 3,08901-80064
This is a preliminary edition of software which should be replaced by the most recent edition.
2. Software date code: 272.1983
(2334A to 2426A)
ROM part numbers:
ROM 1,08901-80066
ROM 2,08901-80067
ROM 3, 08901-80068
This is the first edition of software in production instruments.
3.
Software date code: 115.1984
(2432A
to
2550A)
ROM part numbers:
ROM 1,08901-80071
ROM 2, 08901-80072
ROM 3, 08901-80073
7-
1
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