Commodore VIC-20 User Manual page 311

Appendix B: Memory Usage
297
TAlIIB-1:
Memory Map (continued)
Hex Decimal
Description
Address
Address
0045-0046 69-70 Current variable name
0047-0048 71-72 Current variable address
0049-004A 73-74 Variable pointer for FOR-NEXT
004B-004C
75-76
. Y -save; op-save; BASIC pointer save
004D 77
Comparison symbol accumulator
004E-0053
78-83 Misc. numeric work area, pointers, etc.
0054-0056 84-86
Jump vector for functions
0057-0060
87-96 Misc. numeric work area
0061
97 Accum #1: Exponent
0062-0065
98-101 Accum #1: Mantissa
0066
102
Accum #1: Sign
0067
103 Series evaluation constant pointer
0068 104
Accum #1: High-order (overflow)
0069-006E 105-110
Accum #2: Exponent, etc.
006F 111
Sign. comparison, Acc #1 vs. #2
0070
112 Accum #1: Low-order (rounding)
0071-0072 113-114
Cassette buffer length/ series pointer
0073-008A 115-138
CHRGET subroutine (get BASIC char)
007A-007B 122-123
BASIC pointer (within subroutine)
008B-008F 139-143
RND seed value
0090 144
Status word ST
0091 145
Keyswitch PIA: STOP and RVS flags
0092 146
Timing constant for tape
0093
147
Load
=
0, Verify
=
I
0094
148
Serial output: deferred char flag
0095 149
Serial deferred character
0096
150
Tape EOT received
0097 151
Register save
0098
152 How many open files
0099
153 Input device (normally 0)
009A
154 Output (CMD) device (normally 3)
009B 155
Tape character parity
009C 156 Byte-received flag
009D
157 Direct
=
$80/ RUN
=
0 output control
009E
158 Tape Pass 1 error log/ char buffer