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Compucolor BASIC tokenized file - Just Solve the File Format Problem

Compucolor BASIC tokenized file

From Just Solve the File Format Problem
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File Format
Name Compucolor BASIC tokenized file
Ontology
Extension(s) .bas
Released 1976

The Compucolor computer line was one of the first to support color in text modes as well as graphic mode. The original Compucolor I used an 8-track tape drive to store programs, while the later and more popular Compucolor II had a 5.25" disk drive. BASIC programs had a .BAS extension. The BASIC language was an adapted version of Microsoft BASIC (as was true of many BASICs of the time).

Not much information is readily available about its tokenization system, but it was presumably similar to that of the other Microsoft BASICs, which tended to have the same general scheme, differing only in the specific token assignments. (See articles on other tokenized BASICs for more details.) Some clues as to the possible token values can be seen in the April 1979 newsletter for Compucolor users (the particular part of relevance is at page 33 of the PDF linked below) where shortcut keys for various BASIC commands are listed. These keys use the Control or Command keys along with letters, numbers, or symbols. It is likely these have some correspondence with the token values, most likely with the Command-plus-letter keys representing the high-bit-set version of the control character corresponding to the given letter (e.g., Command-B standing for hex 82, which is Control-B with the high bit set), and the Control-plus-number-or-symbol perhaps representing the high-bit version of that ASCII character. This would produce a token set not much different from those of the other BASICs.

Tokens

(likely tokens reconstructed from clues as noted above)

Hex Dec Token meaning
80 128 END
81 129 FOR
82 130 NEXT
83 131 DATA
84 132 INPUT
85 133 DIM
86 134 READ
87 135 FILE
88 136 GOTO
89 137 RUN
8A 138 IF
8B 139 RESTORE
8C 140 GOSUB
8D 141 RETURN
8E 142 REM
8F 143 GET
90 144 OUT
91 145 PUT
92 146 PLOT
93 147 SAVE
94 148 LOAD
95 149 POKE
96 150 PRINT
97 151 LIST
98 152 CONT
99 153 CLEAR
9A 154 DEF
9B 155 WAIT
9C 156 ON
9D 157 TAB(
9E 158 TO
9F 159 FN
A0 160 SPC(
A1 161 THEN
A2 162 NOT
A3 163 STEP
A4 164 +
A5 165 -
A6 166 *
A7 167 /
A8 168 ^
A9 169 AND
AA 170 OR
AB 171 >
AC 172 =
AD 173 <
AE 174 SGN
AF 175 INT
B0 176 ABS
B1 177 CALL
B2 178 FRE
B3 179 INP
B4 180 POS
B5 181 SQR
B6 182 RND
B7 183 LOG
B8 184 EXP
B9 185 COS
BA 186 SIN
BB 187 TAN
BC 188 ATN
BD 189 PEEK
BE 190 LEN
BF 191 STR$
C0 192 VAL
C1 193 ASC
C2 194 CHR$
C3 195 LEFT$
C4 196 RIGHT$
C5 197 MID$
C6 198 ?

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