Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
This article describes a means through a light-emitting diode (LED) display panel to monitor progress of power-on self-test (POST) to increase usability and provide greater feedback to the user.
describes a means through a light-emitting
diode (LED) display panel to monitor progress of power-on self-test
(POST) to increase usability and provide greater feedback to the
information panel of this disclosure is shown in block
diagram form in Figure 1. It is partitioned into three functional
parts as follows:
1. Alpha-numeric display.
2. Power control unit.
3. Speaker assembly.
the alpha-numeric display will be used as the main
means of displaying checkpoints or error codes when there is a system
failure. This feature is not only user friendly but also practical
to the users and repair personnel.
alpha-numeric display's data input is gated by a signal
called "-CS LED" on the planar. This signal is decoded from an I/O
Write to address 108 Hex through 10F Hex. 108 Hex is assigned to the
rightmost position, and 10F Hex is the leftmost position on the
display. In addition, -Write Low and -Write High are signals
generated from the planar logic to select the lower four positions
and the higher four positions of the display, respectively.
Figure 2 is a
power switch truth table. Two
button switches are used as a secondary power-on switch. SW1 is the
remote initial program load (IPL) switch, and SW2 is the main power
on/off switch. When SW2 is on, Power On Sense signal will be
grounded and the power supply will be turned...