General Description 1-13
Table 1-6 shows how to interpret the battery indicators.

1.4.2 Exter nal Battery Charger Option

An optional external battery charger is available that charges a battery outside of the
computer (all three types of batteries used by the Extensa 660 Series). To order an
optional battery charger (or any of the Extensa options), contact your computer dealer
or call Texas Instruments at 1-800-TI-TEXAS.
1.5 Standard Test Features
The Extensa 660 Series Notebook Computers use modular design and built-in test
features to reduce the mean time to repair. A power on self test program automatically
verifies the operational state of the primary circuits and a powerful suite of diagnostic
tests (known as PC-Doctor) are available to further test selected parts of the system.

1.5.1 Power On Self Test

The Extensa line of notebook computers contain a BIOS-resident, Power On Self Test
(POST) that automatically performs a test of memory and all major circuits each time
the computer is powered up. In the event of a failure, the computer displays a descriptive
error message and issues a series of coded beeps (in case the display subsystem is not
functioning). If self test completes normally, the computer displays the amount of
memory tested, loads the Operating System and Windows environment.

1.5.2 PC-Doctor Diagnostics Program

The Extensa 660 Series Notebooks are shipped with PC-Doctor for Windows, a powerful
diagnostics tool that can help you scan a system for viruses, determine the hardware
configuration of a local or remote system, benchmark its performance, analyze the
performance of all subsystems, and perform a suite of interactive and non-interactive
tests on attached devices (such as printers, VGA monitors, SCSI® devices, CD-ROM
drives). The test results are stored in a log which can be printed out (by pressing F2)
or saved in a disk file (by pressing F3).
Features of the diagnostic program are accessed through a series of pull-down menus
and basic keyboard keys (cursor keys to move highlighted pointer, Enter key to select
a highlighted feature, Esc key to cancel a function and move back one level.
Table 1-6 Interpreting the Battery Charge Indicators
No. of Indicators On Charge in Battery
None Less then 20% (ORG)
1 20% to 40% (GRN)
2 40% to 60% (GRN)
3 60% to 80% (GRN)
4 80% to 100% (GRN)