programming algorithm of speed. For some flashs, it indicates
the current Protect-Setting-Byte(PSB) setting value.
(3)
CHECKSUM
: Displays the master checksum value calculated
during the last read-related actions such as "VERIFY", "COPY",
etc. The machine will beep every time this value has changed.
This value is calculated by one's complement method for the
convenience of recognizing a blank $FF device. For the
compatibility with other machines, there is a normal checksum
value displayed just below this field each time when the
"CHECKSUM" command is executed.
(4)
MESSAGE
: display the general operation message.
[
PROM9801]
For devices which has the "T48" message shown
4on this field when its name was selected should be handled on
the upper 48pin textools.
2-2. key switches
ALGORITHM
CHECKSUM
VERIFY
COPY
KEY1
KEY2
Yes
No
-NAME
+NAME
Force
KEY3
TRANSFER ON/OFF
SPECIAL FUNCTION
3. The key-switch command operations
Checksum
[key1]:
It calculated two types of checksum value of the master IC's memory
contents. The first one is calculated by adding up the one's complement
3
