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Off-Line Operation
where dddd is the hexadecimal value of the check-sum obtained. The check-sum
is the 2's complement of the 16-bit sum of all the bytes loaded into the RAM.
For PROMs greater than 32K you will get the message LOADING, although load
ing does not occur. You will get a valid check-sum, though. The ROM TO RAM
key clears any editing done on PROMs greater than 32K. If you do not need a
check-sum, use the faster DEVICE SELECT key to clear editing changes on
PROMs greater than 32K.
If the PROM device is blank, the following message is displayed after loading is
complete:
PROM BLANK CKSUM = dddd
Thus the ROM TO RAM key is a convenient off-line way to determine if a PROM
device is blank.
VER
Verifies PROM against
RAM data
Function
The VER key compares the PROM device data against the RAM data. While
verification is in progress, the following message is displayed in the command field
of the alphanumeric display:
VERIFY
If all locations compare, the VERIFY message in the command field is blanked
out, and the following message is displayed at the end of the verification:
END VERIFY CKSUM = dddd
where dddd is the hexadecimal value of the check-sum obtained. The check-sum
is the 2's complement of the 16-bit sum of all the bytes verified.
For PROMs greater than 32K you will get the message VERIFY, although verifica
tion does not occur. You will get a valid check-sum, though.
If a mismatch occurs, the following message is displayed:
VER ERR @
The address field contains the address (aaaaaa) at which the mismatch occurred,
and the data field (dd) contains the exclusive OR of the expected and actual data.
After a mismatch, pressing the VER key again continues verification, starting at
the next address after the mismatch address. A subsequent mismatch causes the
events described previously. Pressing the CLEAR key aborts the verify function if
a mismatch occurs.
3-4
aaaaaa
dd
iUP-200A/201A
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