Commodore PET User Manual page 428

Table G-1.
PET
Memory Map (Rev 2 ROMs) (Continued)
Memory Address
Sample Value
Decimal
122-123
124-125
126-127
128-129
130-131
132-133
134-135
136-137
138-139
140-141
142-143
144-145
146-147
148-149
,150-151
152-153
154-155
156
157-158
159-160
161
162
163
164-165
166-171
172-173
174-175
176-181
182
183
184-189
190
191
192-193
Hexadecimal
007A-007B
007C-0070
007E-007F
0080-0081
0082-0083
0084-0085
0086-0087
0088-0089
008A-008B
008C-0080
008E-008F
0090-0091
0092-0093
0094-0095
0096-0097
0098-0099
009A-009B
009C
0090-009E
009F-00AO
OOAl
00A2
00A3
00A4-00A5
00A6-00AB
OOAC-OOAO
OOAE-OOAF
00BO-00B5
00B6
00B7
00B8-00BO
OOBE
OOBF
OOCO-OOCl
Decimal
1025
1946
2072
2231
8192
8191
8192
2000
110
1922
1150
1879
13
89
2032
2032
31999
a
898
104
221
3
76
a
129
a
a
a
a
a
a
a
a
a
a
a
a
a
258
Hexadecimal
0401
079A
0818
08B7
2000
1FFF
2000
0700
006E
0782
047E
0757
0000
0059
07FO
07FO
7CFF
00
0382
0068
00
03
4C
0000
81
00
00
00
00
00
00
00
00
00
00
00
00
00
0102
Description
Data BASIC Storage Maintenance
Pointer ta start of text
Pointer ta start of variables
Pointer ta end of variables
Pointer ta end of arrays
Pointer ta start of strings Imoving downl
Pointer ta end of strings Itop of avadable
RAM)
Pointer ta limit of BASIC memory
Line number of current line being
executed
-1 in 137=direct mode statement
Line number for last line executed
before CO NT
Pointer ta next line ta be executed after
CONT
Line number of current OATA line
Pointer ta current OATA line
Next OATA item within line
Current variable na me
Pointer ta current variable
Pointer ta next FOR. NEXT variable
Pointer ta current operator in ROM table
Mask for current logical operator
Pointer ta user function FN definition
Pointer ta a string description
Length of string
Constant used by garbage collection
routine
Constant 6502 JMP instruction
Jump vector for user function FN
Floating point accumulator *3 16 bytes)
Black transfer pointer * 1
Black transfer pomter *2
Floatmg pomt accumulator IFAC) * 1
16 bytes)
176 OOBO Exponent
+
128
177 OOB 1 Fraction MSB Floatmg
Pomt
178 00B2 Fraction
179 00B3 Fraction MSB Integer
180 00B4 Fraction LSB
181 00B5 Sign of fraction
la
if zero or
positive, --1 if negative)
Copy of FAC * 1 slgn of fraction
Counter for number of bits ta shift ta
normalize FAC * 1
Floatmg point accumulator *2 16 bytes)
Overflow byte for floating argument
Copy of FAC *2 sign of fraction
Conversion pointer
415