Texas Instruments 990 Operation Manual page 95

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945255-9701
Application notes: No check is made to ensure that the mask does not exclude a bit required by
the desired value, thereby making a match impossible. If the monitor is being searched, results
may not appear to be correct since the monitor is changing during the search process.
Examples:
.FW 0,2999,456,
0300=0456
.FW 0,2000,56,00FF
0300=0456
0644=0556
In the second example, the monitor searches for words with a 56 in the low order byte. By
pressing the space bar on the terminal keyboard, the user can cause the monitor to continue
searching for another occurrence of the data word.
3.4.30 HEXADECIMAL ARITHMETIC (HA). The Hexadecimal Arithmetic command calculates
the sum and difference of two hexadecimal numbers. The 2's complement hexadecimal value and
the signed decimal value are printed.
Syntax definition:
HA
[{i . ..}
[<value>]
[{i .
.J
<value>]]
The command is terminated by a carriage return.
Parameters:
value Hexadecimal number value.
Parameter default values:
If the value parameter is not specified, a default value of 0 is used.
Application note: No overflow checks are made; therefore, two positive numbers may have a
negative sum. All results are represented in 16 bits.
Examples:
.HA 103A BA2
SUM=1 BDC +07132 DIFF=0498 +01176
.HA 89 89
SUM=0112 +00274 DIFF=OOOO +00000
Digital Systems Division