The LTDEF variable - Elite on the 6502

       Name: LTDEF                                                   [Show more]
       Type: Variable
   Category: Demo
    Summary: Line definitions for characters in the Star Wars scroll text
  Deep dive: The 6502 Second Processor demo mode
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * GRIDSET uses LTDEF


 Characters in the scroll text are drawn using lines on a 3x6 numbered grid
 like this:

   0   1   2
   .   .   .
   3   4   5
   .   .   .
   6   7   8
   9   A   B

 The low nibble of each byte is the starting point for that line segment, and
 the high nibble is the end point, so a value of &28, for example, means
 "draw a line from point 8 to point 2". This table contains definitions for all
 the characters we can use in the scroll text, as lines on the above grid.


.LTDEF

 EQUB &63, &34, &47, &76, &97   \ Letter definition for ","
 EQUB &35, &00, &00, &00, &00   \ Letter definition for "-"
 EQUB &63, &34, &47, &76, &00   \ Letter definition for "."
 EQUB &61, &00, &00, &00, &00   \ Letter definition for "/"
 EQUB &73, &31, &15, &57, &00   \ Letter definition for "0"
 EQUB &31, &17, &00, &00, &00   \ Letter definition for "1"
 EQUB &02, &25, &53, &36, &68   \ Letter definition for "2"
 EQUB &02, &28, &86, &35, &00   \ Letter definition for "3"
 EQUB &82, &23, &35, &00, &00   \ Letter definition for "4"
 EQUB &20, &03, &35, &58, &86   \ Letter definition for "5"
 EQUB &20, &06, &68, &85, &53   \ Letter definition for "6"
 EQUB &02, &28, &00, &00, &00   \ Letter definition for "7"
 EQUB &60, &02, &28, &86, &35   \ Letter definition for "8"
 EQUB &82, &20, &03, &35, &00   \ Letter definition for "9"
 EQUB &00, &00, &00, &00, &00   \ Letter definition for ":" (blank)
 EQUB &00, &00, &00, &00, &00   \ Letter definition for ";" (blank)
 EQUB &00, &00, &00, &00, &00   \ Letter definition for "<" (blank)
 EQUB &00, &00, &00, &00, &00   \ Letter definition for "=" (blank)
 EQUB &00, &00, &00, &00, &00   \ Letter definition for ">" (blank)
 EQUB &00, &00, &00, &00, &00   \ Letter definition for "?" (blank)
 EQUB &00, &00, &00, &00, &00   \ Letter definition for "@" (blank)
 EQUB &60, &02, &28, &35, &00   \ Letter definition for "A"
 EQUB &60, &02, &28, &86, &35   \ Letter definition for "B"
 EQUB &86, &60, &02, &00, &00   \ Letter definition for "C"
 EQUB &60, &05, &56, &00, &00   \ Letter definition for "D"
 EQUB &86, &60, &02, &35, &00   \ Letter definition for "E"
 EQUB &60, &02, &35, &00, &00   \ Letter definition for "F"
 EQUB &45, &58, &86, &60, &02   \ Letter definition for "G"
 EQUB &60, &28, &35, &00, &00   \ Letter definition for "H"
 EQUB &17, &00, &00, &00, &00   \ Letter definition for "I"
 EQUB &28, &86, &63, &00, &00   \ Letter definition for "J"
 EQUB &60, &23, &83, &00, &00   \ Letter definition for "K"
 EQUB &86, &60, &00, &00, &00   \ Letter definition for "L"
 EQUB &60, &04, &42, &28, &00   \ Letter definition for "M"
 EQUB &60, &08, &82, &00, &00   \ Letter definition for "N"
 EQUB &60, &02, &28, &86, &00   \ Letter definition for "O"
 EQUB &60, &02, &25, &53, &00   \ Letter definition for "P"
 EQUB &60, &02, &28, &86, &48   \ Letter definition for "Q"
 EQUB &60, &02, &25, &53, &48   \ Letter definition for "R"
 EQUB &20, &03, &35, &58, &86   \ Letter definition for "S"
 EQUB &02, &17, &00, &00, &00   \ Letter definition for "T"
 EQUB &28, &86, &60, &00, &00   \ Letter definition for "U"
 EQUB &27, &70, &00, &00, &00   \ Letter definition for "V"
 EQUB &28, &84, &46, &60, &00   \ Letter definition for "W"
 EQUB &26, &08, &00, &00, &00   \ Letter definition for "X"
 EQUB &74, &04, &24, &00, &00   \ Letter definition for "Y"
 EQUB &02, &26, &68, &00, &00   \ Letter definition for "Z"
Demo: LTDEF

[6502 Second Processor version]
