git.mutantstargoat.com Git - megatris/blob - src/romhdr.S

   1 | the following will go into the custom .romhdr section which will be placed at
   2 | address 100h of the binary by the linker (see lnkscript).
   3         .section .romhdr,"a"
   4
   5 #ifndef GAMENAME
   6 #define GAMENAME "unnamed"
   7 #endif
   8 #ifndef VERSTR
   9 #define VERSTR "00"
  10 #endif
  11
  12         .ascii "SEGA MEGA DRIVE (C)MINDLAPSE2017"
  13 hdr_game_dom:
  14         .ascii GAMENAME
  15 hdr_game_dom_end:
  16         .fill 48 - (hdr_game_dom_end - hdr_game_dom),1,32 | pad to 48 bytes with spaces
  17 hdr_game_int:
  18         .ascii GAMENAME
  19 hdr_game_int_end:
  20         .fill 48 - (hdr_game_int_end - hdr_game_int),1,32 | pad to 48 bytes with spaces
  21         .ascii "GM"             | it's a game (who cares what it is?)
  22         .ascii "0000000-"       | product code
  23         .ascii VERSTR           | version string
  24         .short 0                | checksum
  25         .ascii "J               " | I/O support (joypad)
  26         .long 0                 | start address of ROM
  27         .long _rom_end          | last address of ROM
  28         .long 0xff0000          | start address of RAM
  29         .long 0xffffff          | last address of RAM
  30         .long 0                 | SRAM enabled(?)
  31         .long 0                 | ???
  32         .long 0                 | start address of SRAM
  33         .long 0                 | last address of SRAM
  34         .long 0                 | ???
  35         .long 0                 | ???
  36         .fill 40,1,32           | notes (fill with spaces for now TODO)
  37         .ascii "JUE             " | country codes