MMC3.cfg

# NOTE, this assumes you will keep the last bank fixed to c000-ffff, and swap only the first bank 8000-bfff

MEMORY {
#RAM Addresses:
    # Zero page
    ZP: start = $00, size = $100, type = rw, define = yes;
    #note, the c compiler + neslib + famitone2 use about 60 zp addresses, I think

    #note OAM: start = $0200, size = $0100, define = yes;
    #note, sprites stored here in the RAM

    RAM: start = $0300, size = $0400, define = yes;
    #note, I located the c stack at 700-7ff, see below

    WRAM: start = $6000, size = $2000, define = yes;

#INES Header:
    HEADER: start = $0, size = $10, file = %O ,fill = yes;


#ROM Addresses:

    PRG0: start = $8000, size = $2000, file = %O, fill = yes, define = yes;
    PRG: start = $a000, size = $4000, file = %O ,fill = yes, define = yes;
    PRGLAST: start = $e000, size = $2000, file = %O ,fill = yes, define = yes;
# make sure the reset code is in e000-ffff, see below

# ! 1 Banks of 8K CHR ROM
    CHR: start = $0000, size = $2000, file = %O, fill = yes;
}

SEGMENTS {
    HEADER:   load = HEADER,         type = ro;

# this needs to be in the fixed bank between e000 and ffff
    LOWCODE:  load = PRG,            type = ro,                optional = yes;
    INIT:     load = PRG,            type = ro,  define = yes, optional = yes;
    CODE:     load = PRG,            type = ro,  define = yes;
    RODATA:   load = PRG0,            type = ro,  define = yes;
    DATA:     load = PRG, run = RAM, type = rw,  define = yes;
    CHARS:    load = CHR,            type = rw;
    BSS:      load = RAM,            type = bss, define = yes;
    HEAP:     load = RAM,            type = bss, optional = yes;
    ZEROPAGE: load = ZP,             type = zp;
    ONCE:     load = PRG,            type = ro,  define = yes;

    XRAM:      load = WRAM,             type = bss, define = yes;

    BANK0:    load = PRG0,           type = ro, define = yes;

    STARTUP:  load = PRGLAST,          type = ro, define = yes;

# needs to be in the e000-ffff fixed bank
    SAMPLES:  load = PRG, start = $d500, type = ro;


    VECTORS:  load = PRGLAST, start = $fffa, type = ro;
}

FEATURES {
    CONDES: segment = INIT,
        type = constructor,
        label = __CONSTRUCTOR_TABLE__,
        count = __CONSTRUCTOR_COUNT__;
    CONDES: segment = RODATA,
        type = destructor,
        label = __DESTRUCTOR_TABLE__,
        count = __DESTRUCTOR_COUNT__;
    CONDES: type = interruptor,
        segment = RODATA,
        label = __INTERRUPTOR_TABLE__,
        count = __INTERRUPTOR_COUNT__;
}




SYMBOLS {

    __STACKSIZE__: type = weak, value = $0100;     # 1 page stack
    __STACK_START__: type = weak, value = $0700;

    NES_MAPPER:      type = weak, value = 4;             # mapper number, 4 = mmc3, txrom
    NES_PRG_BANKS:     type = weak,  value = 2;             # number of 16K PRG banks, = 512k
    NES_CHR_BANKS:      type = weak, value = 1;             # number of 8K CHR banks, = 8k
    NES_MIRRORING:      type = weak, value = 0;             # 0 horizontal, 1 vertical, 8 four screen, mmc3 can switch mirroring

}