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nneonneo • today at 3:07 PM • 1 reply • view on HN

Hmm, based on the (handwritten!) notes on Table F-2 in http://bitsavers.informatik.uni-stuttgart.de/pdf/exidy/DP500..., it looks like pressing Graphic+key would allow you to enter BASIC tokens from 0x80 to 0xBF, while pressing Graphic+Shift+key would allow you to access 0xC0 to 0xC6. By inference, it seems like Graphic+Shift+key should allow access to the entire 0xC0 to 0xFF space, but most of those keys are undocumented.

Based on this, I wonder if it's worth trying the following:

    10 REM [Graphic+Shift+=] [_] [(] [Graphic+Shift+NumpadPlus] [2] [Graphic+Shift+NumpadEquals] [Graphic+Shift+Numpad6] [Graphic+Shift+0]
Note that you'll probably need an emulator with accurate keyboard emulation - or a real device - in order to type these in. However, with the emulator from http://www.liaquay.co.uk/sorcerer, I was able to confirm that Graphic+Shift+0 produced 201 (rendered as F4), and Graphic+Shift+= produced 255 (rendered as S), so I think this approach will work.

Replies

nneonneo • today at 3:15 PM

Bonus: Here's what all of the tokens >= 0x80 render as, including the corrupt ones:

  128 0x80 b'END'
  129 0x81 b'FOR'
  130 0x82 b'NEXT'
  131 0x83 b'DATA'
  132 0x84 b'BYE'
  133 0x85 b'INPUT'
  134 0x86 b'DIM'
  135 0x87 b'READ'
  136 0x88 b'LET'
  137 0x89 b'GOTO'
  138 0x8a b'RUN'
  139 0x8b b'IF'
  140 0x8c b'RESTORE'
  141 0x8d b'GOSUB'
  142 0x8e b'RETURN'
  143 0x8f b'REM'
  144 0x90 b'STOP'
  145 0x91 b'OUT'
  146 0x92 b'ON'
  147 0x93 b'NULL'
  148 0x94 b'WAIT'
  149 0x95 b'DEF'
  150 0x96 b'POKE'
  151 0x97 b'PRINT'
  152 0x98 b'CONT'
  153 0x99 b'LIST'
  154 0x9a b'CLEAR'
  155 0x9b b'CLOAD'
  156 0x9c b'CSAVE'
  157 0x9d b'NEW'
  158 0x9e b'TAB('
  159 0x9f b'TO'
  160 0xa0 b'FN'
  161 0xa1 b'SPC('
  162 0xa2 b'THEN'
  163 0xa3 b'NOT'
  164 0xa4 b'STEP'
  165 0xa5 b'+'
  166 0xa6 b'-'
  167 0xa7 b'*'
  168 0xa8 b'/'
  169 0xa9 b'^'
  170 0xaa b'AND'
  171 0xab b'OR'
  172 0xac b'>'
  173 0xad b'='
  174 0xae b'<'
  175 0xaf b'SGN'
  176 0xb0 b'INT'
  177 0xb1 b'ABS'
  178 0xb2 b'USR'
  179 0xb3 b'FRE'
  180 0xb4 b'INP'
  181 0xb5 b'POS'
  182 0xb6 b'SQR'
  183 0xb7 b'RND'
  184 0xb8 b'LOG'
  185 0xb9 b'EXP'
  186 0xba b'COS'
  187 0xbb b'SIN'
  188 0xbc b'TAN'
  189 0xbd b'ATN'
  190 0xbe b'PEEK'
  191 0xbf b'LEN'
  192 0xc0 b'STR$'
  193 0xc1 b'VAL'
  194 0xc2 b'ASC'
  195 0xc3 b'CHR$'
  196 0xc4 b'LEFT$'
  197 0xc5 b'RIGHT$'
  198 0xc6 b'MID$'
  199 0xc7 b'\x00\t'
  200 0xc8 b'G.'
  201 0xc9 b'F4'
  202 0xca b'K'
  203 0xcb b'5'
  204 0xcc b'H\x03'
  205 0xcd b'`C'
  206 0xce b'JO'
  207 0xcf b'Mr'
  208 0xd0 b'J'
  209 0xd1 b'L'
  210 0xd2 b'Hr'
  211 0xd3 b'HU'
  212 0xd4 b'HD'
  213 0xd5 b'I'
  214 0xd6 b']'
  215 0xd7 b'Fa'
  216 0xd8 b'H'
  217 0xd9 b'\x10'
  218 0xda b'H'
  219 0xdb b'7'
  220 0xdc b'H\x07'
  221 0xdd b'GV'
  222 0xde b'R&'
  223 0xdf b'IH'
  224 0xe0 b'G\\'
  225 0xe1 b'R\x1f'
  226 0xe2 b'O\x05'
  227 0xe3 b'Wh'
  228 0xe4 b'I5'
  229 0xe5 b'G'
  230 0xe6 b'F'
  231 0xe7 b'E\x0f'
  232 0xe8 b'HA'
  233 0xe9 b'S'
  234 0xea b'I'
  235 0xeb b'R\x1a'
  236 0xec b'Dy'
  237 0xed b'"'
  238 0xee b'Wy'
  239 0xef b'*'
  240 0xf0 b'S|'
  241 0xf1 b'j'
  242 0xf2 b'T|K'
  243 0xf3 b'U\x7f'
  244 0xf4 b'C'
  245 0xf5 b'XP'
  246 0xf6 b'('
  247 0xf7 b'LF'
  248 0xf8 b"'"
  249 0xf9 b'LNFSNRGODFCOVOMULBSDD/0IDTMOSLSSTCNUFMO'
  250 0xfa b'Ck'
  251 0xfb b'@'
  252 0xfc b'C'
  253 0xfd b'e'
  254 0xfe b'G'
  255 0xff b'S\x00'
This is based on a simple decoding of the token table starting at 0xf6 in the BASIC ROM; it matches the observed output for 201, 247, 252, and 255 so I expect that it is generally correct. Indeed, with `10 REMX; POKE 474, 249; LIST` in the emulator, I get `10 REMLNFSNRGODFCOVOMULBSDD/0IDTMOSLSSTCNUFMO` printed out, which further confirms this decoding.
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