megadrive_test2
view src/romhdr.S @ 11:302bcd73edc4
added 6button support
author | John Tsiombikas <nuclear@member.fsf.org> |
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date | Sat, 24 Jun 2017 03:47:37 +0300 |
parents | |
children |
line source
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"
5 #ifndef GAMENAME
6 #define GAMENAME "unnamed"
7 #endif
8 #ifndef VERSTR
9 #define VERSTR "00"
10 #endif
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