megadrive_test2

annotate src/romhdr.S @ 3:b22bc95f0cc0

added vim modelines
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 14 Mar 2017 09:11:18 +0200
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rev   line source
nuclear@0 1 | the following will go into the custom .romhdr section which will be placed at
nuclear@0 2 | address 100h of the binary by the linker (see lnkscript).
nuclear@0 3 .section .romhdr,"a"
nuclear@0 4
nuclear@0 5 #ifndef GAMENAME
nuclear@0 6 #define GAMENAME "unnamed"
nuclear@0 7 #endif
nuclear@0 8 #ifndef VERSTR
nuclear@0 9 #define VERSTR "00"
nuclear@0 10 #endif
nuclear@0 11
nuclear@0 12 .ascii "SEGA MEGA DRIVE (C)MINDLAPSE2017"
nuclear@0 13 hdr_game_dom:
nuclear@0 14 .ascii GAMENAME
nuclear@0 15 hdr_game_dom_end:
nuclear@0 16 .fill 48 - (hdr_game_dom_end - hdr_game_dom),1,32 | pad to 48 bytes with spaces
nuclear@0 17 hdr_game_int:
nuclear@0 18 .ascii GAMENAME
nuclear@0 19 hdr_game_int_end:
nuclear@0 20 .fill 48 - (hdr_game_int_end - hdr_game_int),1,32 | pad to 48 bytes with spaces
nuclear@0 21 .ascii "GM" | it's a game (who cares what it is?)
nuclear@0 22 .ascii "0000000-" | product code
nuclear@0 23 .ascii VERSTR | version string
nuclear@0 24 .short 0 | checksum
nuclear@0 25 .ascii "J " | I/O support (joypad)
nuclear@0 26 .long 0 | start address of ROM
nuclear@0 27 .long _rom_end | last address of ROM
nuclear@0 28 .long 0xff0000 | start address of RAM
nuclear@0 29 .long 0xffffff | last address of RAM
nuclear@0 30 .long 0 | SRAM enabled(?)
nuclear@0 31 .long 0 | ???
nuclear@0 32 .long 0 | start address of SRAM
nuclear@0 33 .long 0 | last address of SRAM
nuclear@0 34 .long 0 | ???
nuclear@0 35 .long 0 | ???
nuclear@0 36 .fill 40,1,32 | notes (fill with spaces for now TODO)
nuclear@0 37 .ascii "JUE " | country codes