1. Power-on initial
When the power is turn on, the PROM8908 will take a few seconds
to configure its hardware and turn off all the slave's LED lamps. It then
starts to check all textool pins by accessing their address bus(A0..A15)
and data bus(D0..D7). If there was any error, it will shows " D. BUS
ERROR !!!" on the LCD display and it shouldn't be used for any IC
related operation. If the test was passed, it brings up the device name
which is the last operated one before the previous power-off, and be
ready to use.
If the PSB(Protection-Setting-Byte) byte was not set to zero, a
warning message "PSB is Locked, Press any key" will appear at the
final check to alert the user and wait for an acknowledgment of this
situation.
The machine's stack is always been checked at every command
operation to make sure that this machine is in a good condition. If a "
Stack error!" message appears at anytime, this machine should be doubt
on its reliability.
There shouldn't has any IC left on the textools when the power is turn
on or off. This might cause an unreliable self-checking results or will
damage this IC.
2. The layout of key switches and LCD display
2-1. The LCD panel
$ |
MESSAGE
P VPP=12.5V
i27256 0000
DEVICE NAME
|
CHECKSUM
(1)
DEVICE NAME
:
Shows the current device being processed.
(2)
$
: For EPROMs, this field indicates the current
2
