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Off-Line Operation
LOCK
j; SH IFT
4
Locks the EPROM device
Function
The SHIFT key used with the LOCK 4 key locks the EPROM device from
unauthorized access (on EPROMs on which this feature is supported). Two types
of EPROMs can be locked: those with a security bit and those that are
authenticated.
The exact wording of the prompts and error messages may vary
among personality modules. Refer to the user's guide of the per
sonality module you are using for legal parameter values.
EPROM devices with a security bit can be locked from external access but cannot
be unlocked without erasing the device. When you press the SHIFT and LOCK 4
keys simultaneously, the following appears in the command field of the alpha
numeric display:
E X E C U TE ?--Y = F /N = 0
If you enter F, the EPROM is locked and the following message is displayed in the
command field:
END LOCK
If the EPROM cannot be locked, the following message is displayed in the com
mand field:
LOCK FAILED
If the EPROM is blank or already locked, the following message is displayed in the
command field when you enter SHIFT-LOCK 4:
ALREADY LOCKED
You can lock and unlock authenticated EPROMs using an 8-byte identity code.
The universal programmer needs several values to lock an EPROM. It asks you for
this information by sending you prompts and blinking the data field. Enter the
values you want to change and press ENTER. If you do not want to change a value
in the data field, press only ENTER to call up the next prompt.
When you press the SHIFT and LOCK 4 keys simultaneously, the following ap
pears in the command field of the alphanumeric display:
DELAY CNT
The delay count lets you specify the speed at which the authentication handshake
takes place.
The key number identifies the PROM to the key manager. The universal program
mer prompts for the first byte of the key number as follows:
KEY NUM-1
3-12
NOTE
dd
iUP-200A/201A
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