Power On Reset (Por); Basic Assurance Test (Bat) - IBM 6360 Product Support Manual

than is available in BAT, the Resident
Non-Automatic Diagnostics can be used.
They are described later in this sec-
tion.
Power On Reset (PaR)
When the system is powered on, the
power supply will set the system elec-
tronics to a known condition until all
power supply voltages are at the prop-
er level. This is known as a Power On
Reset (PaR). During POR, all eight
LEDs on electronics panel 1 are turned
on for approximately one second and
then off. If there is a power supply
problem, one or more of the power sup-
ply LEDs (A through C) will remain on.
If no power supply problem is found,
the Basic Assurance Test (BAT) starts
testing the System.
Basic Assurance Test (BAT)
The Basic Assurance Test (BAT) is a
series of tests executed in sequence.
The BAT is part of ROS and is automat-
ically started when the power supply
successfully completes paR. BAT can
be restarted by using the Memory
Record Button located on electronics
panel 1. The run time of the BAT is
from 10 to 20 seconds, depending on
the amount of RAM that is tested.
The function of the BAT is to perform
a quick status check on the system.
The BAT operation requires no user
action unless system problems are
sensed. The BAT should normally be
followed by a system Initial Program
Load (IPL).
The system areas tested include the
system card, the memory card, the dis-
play adapter card, the diskette adapt-
er, the keyboard adapter, and the
keyboard logic card. These components
are required for the following pur-
poses:
•
•
•
•
Loading th6 Application Program
from the Application Program
Diskette into Random Access Memory
(RAM) .
Sensing errors or handling hard-
ware and software failures during
and after the system IPL.
Loading diagnostics from the Diag-
nostic Diskette into RAM.
Loading Problem Determination Pro-
cedures from the customer Problem
Determination Diskette into RAM.
• Indicating error symptoms or
progress during execution of sys-
tem IPL, Diagnostics, or customer
Problem Determination Procedures.
The BAT is divided in two major parts;
BAT before the display is operational
(initialized), and BAT after display
initialization. If a failure occurs
before display initialization, the
syst·em will attempt to post a display
failure code (see BAT progress error
codes). The code will be displayed
only if the display adapter and dis-
play are operational. If the code
cannot be displayed, the LEDs may be
used to determine the failure. During
a normal BAT, display initialization
occurs after the display adapter has
been tested (Figure 9-1).
9-2 IBM Displaywriter Product Support Manual