Find Byte (Fb) - Texas Instruments 990 Operation Manual

Jd75\ _ _ _
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945255-9701
Parameter default values:
If no parameters are specified, all trace regions are cleared.·
If only the first parameter is given, only the specified trace region will be cleared.
If only the second parameter is given, trace regions 0 through the specified ending trace region
will be cleared.
Error message:
OPl3 A trace region index greater than the maximum possible
index number (3) was specified, or the ending region
index was less than the starting region index number.
Examples:
.CR 1,3
.CR
In the first example, all but region 0 are cleared. In the second example, all regions are cleared.
3.4.28 FIND BYTE (FB). The Find Byte command is used to scan an area of memory for a
particular byte value.
Syntax definition:
FB
{~
.
.J
[<start mem addr>]
{~
.
.J
[<ending mem addr>]
kJ
<desired value>
[k . ..l
<maSk>]
The command is terminated by a carriage return.
Parameters:
start mem addr
ending mem addr
desired value
mask
Memory address at which search
begins.
Memory address at which search
is terminated.
Hexadecimal value for which the
search is made. This value is
required.
Hexadecimal value to be ANOed
with each byte before comparing
it with the desired value.
3-54
Digital Systems Division