Tandy 200 BASIC tokenized file
m (Model 100, Tandy 102 appear identical) |
(Add note that VirtualT requires PL PH to be set exactly) |
||
| Line 299: | Line 299: | ||
|NULL byte (`0x00`) to signal end of line. | |NULL byte (`0x00`) to signal end of line. | ||
|} | |} | ||
| + | |||
| + | === Details for PL PH === | ||
| + | |||
| + | While the address in PL PH is ignored by Tandy portables, the Virtual T emulator (as of version 1.7 in 2022) does a sanity check of files and will refuse to load BASIC files that do not have PL PH set exactly. In particular, each subsequent address must equal the previous address plus the length of the current line. | ||
| + | |||
== Format documentation == | == Format documentation == | ||
Revision as of 12:39, 5 October 2022
Tandy 200 BASIC was a version of Microsoft BASIC for the Radio Shack Tandy 200 computer. The tokenizations for the TRS-80 Model 100 and Tandy 102 appear to be identical. The NEC PC-8201/8300 format is not the same, but should be similar.
Contents |
Tokens
Blank values indicate either that the token is unused or is used for something unknown.
| Hex | Dec | Token meaning | Notes |
|---|---|---|---|
| 80 | 128 | END | |
| 81 | 129 | FOR | |
| 82 | 130 | NEXT | |
| 83 | 131 | DATA | |
| 84 | 132 | INPUT | |
| 85 | 133 | DIM | |
| 86 | 134 | READ | |
| 87 | 135 | LET | |
| 88 | 136 | GOTO | |
| 89 | 137 | RUN | |
| 8A | 138 | IF | |
| 8B | 139 | RESTORE | |
| 8C | 140 | GOSUB | |
| 8D | 141 | RETURN | |
| 8E | 142 | REM | |
| 8F | 143 | STOP | |
| 90 | 144 | WIDTH | |
| 91 | 145 | ELSE | When tokenizing, the Tandy 200 always adds a colon (':') before the ELSE token (3A 91). If the user actually writes :ELSE it is tokenized as 3A 3A 91. |
| 92 | 146 | LINE | |
| 93 | 147 | EDIT | |
| 94 | 148 | ERROR | |
| 95 | 149 | RESUME | |
| 96 | 150 | OUT | |
| 97 | 151 | ON | |
| 98 | 152 | DSKO$ | |
| 99 | 153 | OPEN | |
| 9A | 154 | CLOSE | |
| 9B | 155 | LOAD | Note that LOADM is simply the token for LOAD followed by an ASCII 'M'. |
| 9C | 156 | MERGE | |
| 9D | 157 | FILES | |
| 9E | 158 | SAVE | |
| 9F | 159 | LFILES | |
| A0 | 160 | LPRINT | |
| A1 | 161 | DEF | |
| A2 | 162 | POKE | |
| A3 | 163 | ||
| A4 | 164 | CONT | |
| A5 | 165 | LIST | |
| A6 | 166 | LLIST | |
| A7 | 167 | CLEAR | |
| A8 | 168 | CLOAD | |
| A9 | 169 | CSAVE | |
| AA | 170 | TIME$ | |
| AB | 171 | DATE$ | |
| AC | 172 | DAY$ | |
| AD | 173 | COM | |
| AE | 174 | MDM | |
| AF | 175 | KEY | |
| B0 | 176 | CLS | |
| B1 | 177 | BEEP | |
| B2 | 178 | SOUND | |
| B3 | 179 | LCOPY | |
| B4 | 180 | PSET | |
| B5 | 181 | PRESET | |
| B6 | 182 | MOTOR | |
| B7 | 183 | MAX | |
| B8 | 184 | POWER | |
| B9 | 185 | CALL | |
| BA | 186 | MENU | |
| BB | 187 | IPL | |
| BC | 188 | NAME | |
| BD | 189 | KILL | |
| BE | 190 | SCREEN | |
| BF | 191 | NEW | |
| C0 | 192 | TAB( | |
| C1 | 193 | TO | |
| C2 | 194 | USING | |
| C3 | 195 | VARPTR | |
| C4 | 196 | ERL | |
| C5 | 197 | ERR | |
| C6 | 198 | STRING$ | |
| C7 | 199 | INSTR | |
| C8 | 200 | DSKI$ | |
| C9 | 201 | INKEY$ | |
| CA | 202 | CSRLIN | |
| CB | 203 | OFF | |
| CC | 204 | HIMEM | |
| CD | 205 | THEN | |
| CE | 206 | NOT | |
| CF | 207 | STEP | |
| D0 | 208 | + | |
| D1 | 209 | - | |
| D2 | 210 | * | |
| D3 | 211 | / | |
| D4 | 212 | ^ | |
| D5 | 213 | AND | |
| D6 | 214 | OR | |
| D7 | 215 | XOR | |
| D8 | 216 | EQV | |
| D9 | 217 | IMP | |
| DA | 218 | MOD | |
| DB | 219 | \ | |
| DC | 220 | > | |
| DD | 221 | = | |
| DE | 222 | ||
| DF | 223 | SGN | |
| E0 | 224 | INT | |
| E1 | 225 | ABS | |
| E2 | 226 | FRE | |
| E3 | 227 | INP | |
| E4 | 228 | LPOS | |
| E5 | 229 | POS | |
| E6 | 230 | SQR | |
| E7 | 231 | RND | |
| E8 | 232 | LOG | |
| E9 | 233 | EXP | |
| EA | 234 | COS | |
| EB | 235 | SIN | |
| EC | 236 | TAN | |
| ED | 237 | ATN | |
| EE | 238 | PEEK | |
| EF | 239 | EOF | |
| F0 | 240 | LOC | |
| F1 | 241 | LOF | |
| F2 | 242 | CINT | |
| F3 | 243 | CSNG | |
| F4 | 244 | CDBL | |
| F5 | 245 | FIX | |
| F6 | 246 | LEN | |
| F7 | 247 | STR$ | |
| F8 | 248 | VAL | |
| F9 | 249 | ASC | |
| FA | 250 | CHR$ | |
| FB | 251 | SPACE$ | |
| FC | 252 | LEFT$ | |
| FD | 253 | RIGHT$ | |
| FE | 254 | MID$ | |
| FF | 255 | ' (QUOTE) | When tokenizing, the single quote character expands to three characters: a colon (3A), the byte for REM (8E), and then FF. |
File Format
Tokenised BASIC code is a sequence of tokenized lines. Each tokenized line has the following format:
| Name | Length | Description |
|---|---|---|
| PL PH | 2 bytes | Address of the next line in memory, little endian. This data can be ignored as it is only a placeholder. The value of PL PH in a file is moot because the address is recalculated every time the program loads. Once in memory, PL PH is used to skip to the line required for GOTO, GOSUB, and READ, thus speeding up the program. |
| LL LH | 2 bytes | Line number, little endian. |
| B0 … BN | Any number | Sequence of tokens or ASCII characters. If a character's value is ≥ 128, then it is a token. All tokens are a single byte. |
| NULL | 1 byte | NULL byte (`0x00`) to signal end of line. |
Details for PL PH
While the address in PL PH is ignored by Tandy portables, the Virtual T emulator (as of version 1.7 in 2022) does a sanity check of files and will refuse to load BASIC files that do not have PL PH set exactly. In particular, each subsequent address must equal the previous address plus the length of the current line.
