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Radio Shack TRS-80 Model 4 - Page 100

Radio Shack TRS-80 Model 4
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MEMORY
(ADD
=)-(
'8500'
)
(ENTER)
displays the contents of hexadecimal memory addresses 6500 and
6501
in
the following format:
X'8500'
=
25858
(X'8745')
High
=
X'E100'
Low
=
X'2FFF'
1 The address specified
in
hexadecimal notation.
2 The decimal equivalent of the address.
3 The contents of address and address +
1,
in
MSB-LSB format.
4 The current HIGH$ address.
5 The current LOW$ address.
MEMORY
(ADD =)-(
'E
100'
,WORD
=){
'3E0A
' )
(ENTER)
modifies hexadecimal memory locations ADD (E100) and ADD +1
(E101), changing them
to
the value of WORD. The following display
appears:
X'E100'
=
57800
(X'0000'
=)
X'3E0A')
High
=
){'E100'
LOIAI =
)-('2FFF'
1 The address specified
in
hexadecimal notation.
2 The decimal equivalent of the address.
3 The new contents of address and address +
1,
in
MSB-LSB
format.
4 The current HIGH$ address.
5 6The current LOW$ address.
ME
M0 RY
(A
DD
=){
, E
100
'
,B
YTE
=){
, CS ' )
(ENTER)
changes the BYTE of memory
at
hexadecimal address E100 to
hexadecimal
e9. The display after executing this command is:
X'E100'
=
57800
(X'00'
=)
X'CS')
High
=
)-('E100'
LOIAI =
)-('2FFF'
The display
is
identical
to
the last example, except that the modified
BYTE
is
shown instead of the modified WORD.
MEMORY
(Go")-('
E
100'
)
(ENTER)
transfers control
to
hexadecimal memory address E100.
Error Conditions
If
you set LOW$ equal
to
or
higher than HIGH$, you get the error
message "Range error."
1-95

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