Chapter 6:
MEMORY
MAP
Ali of the changes in Chapter 6
are
based
on
the fact that the memory map
for the old
ROMs
was reorganized for the new
ROMs.
The memory map for the old
ROMs
is
shown in Table
G-1.
at the back of this appendix.
Chapter 6: PET BASIC INTERPRETER
The system locations holding principal pointers in the user program area are
different for the old
ROMs.
Your pointers. in place of Figure 6-2. are
as
shown in
Figure
G-1.
Figure
G-2.
replacing Figure 6-4. also reflects these changes.
Pointer address
Start of program
(247.
248)
Start of text
(144.
145)
DATA statement pointer
(124.
125)
Start of variables
(126.
127)
End
of variables
(128.
129)
End
of arrays
(130.
131)
End
of strings
(132.
133)
Top of memory
"JI
BASIC
~
Statements
,
'",
-
-----
Variables
Ir
------
Arrays
Ir
------
------
~
Strings
Typical Values
1024
1025
1879
1946
2072
2231
8172
(8K
system)
8191 (8Ksystem)
Figure
G-l.
Principal Pointers
in
User Program Area
410
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