Texas Instruments 990 Operation Manual page 71

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3.4.12 MODIFY MEMORY (MM). The Modify Memory command displays the address and
contents of a memory word and accepts a new hexadecimal data value from the user.
Syntax definition:
MM
[{b.J
<memory address>]
The command is terminated by a carriage return.
Parameter:
memory address Address of memory to be modified.
Parameter default value:
If
the memory address is not specified, a value of 0 is used.
Description: If the user inputs a new value, the memory location is modified to match the input
value. If the user terminates his input with a blank lspace), the 11ext location value is printed and
the process repeated.
If
the user tenninates his input with a carriage return or comma, the
command processing terminates.
Error message:
DPOO An invalid hexadecimal value was input.
Application note: The MM command is useful for setting up desired conditions in order to check
out a routine. It is also convenient for creating patches and for examining memory one word at
a
time.
Example:
.MM 1000
1000=FFFF 1
1002=FFFF
3'
l004=FFFF
1006=FF FF 8
These command statements place the value 1 in location 1000, 3 in location
100~.
and 8 in
location 1006. The user may enter a space (blank) if he does not want to modify a location but
wants to go on to the next location. A carriage return terminates the command at any time.
3.4.13 INSPECT MEMORY (1M). The Inspect Memory command is used to display in hexa-
decimal fonnat the contents of one or more consecutive memory locations.
Syntax definition:
1M
[{h.J
<starting mem addr>
[{b . .
.l
<ending mem
addr~
]
The command is tenninated by a carriage return.
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