Commodore PET User Manual page 427

Table G-l. PET Memory Map (Rev 2 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
Terminal 1/0 Maintenance
3
0003
0 00
Active input device number
(O=keyboard)
4 0004 0 00 No. of nulls to print alter CR/LF
(O=normall
5
0005
0 00
Cursor position for
pas
function (0-255)
6 0006
127 7F
Terminal width (unusedl
7 0007 127 7F Limit for scanning source columns
(unused)
8 0008 60 3C Line number storage preceding buller
9 0009 3 03
Constant
10-89 000A-0059 48
30
BASIC input line buller (80 bytes)
90 005A 0 00
General counter for BASIC
91 005B
0 00
Delimiter flag for quote mode scan
92 005C 255 FF
Input buller pointer. general counter
Evaluation of Variables
93 0050 0 00
Flag for dimensioned variables
94
005E
a
00
Flag for variable type:
OO~numeric
FF=string
95 005F
0 00
Flag for numeric variable type:
OO=floating point
80=integer
96 0060 0 00
Flag to allow reserved words in strings
and remarks
97 0061
0 00
Flag to allow subscripted variable
98 0062 0 00
Flag for input type:
O~INPUT
64=GET
152=READ
99 0063 0
00
Flag sign of TAN function
100 0064 0
00
Flag to suppress output:
+
normal
--
suppressed
101 0065 104
68
Index to next available descriptor
102-103 0066-0067
101 0065 Pointer
ta
last string temporary
104-111 0068-006F
2 0002
Table of double-byte descriptors that
point to variables (8 bytes)
112-113 0070-0071 14525
3880 Indirect index * 1
114-115 0072-0073 62983 F607
Indirect index *2
116 0074 1 01 Pseudo-register for function operands
(6 bytes)
117 0075 234 EA
118 0076
0 00
119
0077 0 00
120 0078
a
00
121 0079 0
00
414