Table 6-2.
PET
Memory
Map
(Rev
3 ROMs)
Memory Address
Sample Value
Description
Decimal
Hexadecimal Decimal
Hexadecimal
Page
0 (0-255)
USR Function Locations
0 0000 76
4C
Constant 6502 JMP instructIOn
1-2 0001-0002
826
033A
User address Jump vector
Evaluation of Variables
and
Terminal 1/0 Maintenance
3
0003
0
00
Search character
4
0004
0
00
Delimiter flag for quote mode scan
5 0005
255
FF
Input
buller
pointer. general
counter
6
0006
0
00
Flag for dimensioned variables
7
0007
0
00
Flag for variable type:
OO~numeric
FF~string
8 0008
0 00
Flag for numerlc variable type:
OO~floating
point
80~lnteger
9 0009
0
00
Flag for DATA scan; LIST quote; memory
10
OOOA
0
00
Flag
to
allow subscrlpted variable;
FNx
flag
11
OOOB
0
00
Flag for Input type
O~INPUT
64~GET
152~READ
12
OOOC
0
00
Flag for ATN slgn; comparison evaluation
13
0000
0
00
Flag
to
suppress
output
+ normal
.-
suppressed
14
OOOE
0
00
Current 1/0 device for prompt-suppress
15
OOOF
40
28
Terminai
width
(unusedl
16
0010
30 1E
lImit
for scannlng source columns lunusedl
17-18
0011-0012
828
033C
BasIc integer address (for
SYS.
GOTO.
etc)
19
0013
22
16
Index to next available descriptor
20-21 0014-0015
19 13
Pointer to last string temporary
22-29
0016-0010
2
0002
Table of double-byte descriptions that point
to
variables
18
bytes)
30-31
001
E-001
F
16451
4043
Indirect index
*1
32-33
0020-0021
26119
6607
Indirect index
*2
34 0022
1
01
Pseudo-register for function
operands
(6
bytes)
35 0023
140
8C
36 0024
0
00
37 0025
0
00
38 0026
0 00
39 0027
0
00
334
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