FEATURES {
    STARTADDRESS: default = $2400;
}

SYMBOLS {
    __EXEHDR__:          type = import;
    __SYSTEM_CHECK__:    type = import;  # force inclusion of "system check" load chunk
    __AUTOSTART__:       type = import;  # force inclusion of autostart "trailer"
    __STACKSIZE__:       type = weak, value = $0800; # 2k stack
    __OVERLAYSIZE__:     type = weak, value = $1000; # 4k overlay
    __STARTADDRESS__:    type = export, value = %S;
}

MEMORY {
    ZP:            file = "", define = yes, start = $0082,                  size = $007E;

# just $FFFF
    HEADER:        file = %O,               start = $0000,                  size = $0002;

# "system check" load chunk
    SYSCHKHDR:     file = %O,               start = $0000,                  size = $0004;
    SYSCHKCHNK:    file = %O,               start = $2E00,                  size = $0300;
    SYSCHKTRL:     file = %O,               start = $0000,                  size = $0006;

# "shadow RAM preparation" load chunk
    SRPREPHDR:     file = %O,               start = $0000,                  size = $0004;
    SRPREPCHNK:    file = %O, define = yes, start = %S + __OVERLAYSIZE__,   size = $7C20 - %S - __OVERLAYSIZE__ - $07FF;  # $07FF: space for temp. chargen buffer, 1K aligned
    SRPREPTRL:     file = %O,               start = $0000,                  size = $0006;

# "main program" load chunk
    MAINHDR:       file = %O,               start = $0000,                  size = $0004;
    RAM:           file = %O, define = yes, start = %S +
                                                    __OVERLAYSIZE__ +
                                                    __LOWBSS_SIZE__,        size = $D000 -
                                                                                   __STACKSIZE__ -
                                                                                   %S -
                                                                                   __OVERLAYSIZE__ -
                                                                                   __LOWBSS_SIZE__;

# defines entry point into program
    TRAILER:       file = %O,               start = $0000, size = $0006;

# memory beneath the ROM preceeding the character generator
    HIDDEN_RAM2:   file = "", define = yes, start = $D800, size = $0800;

# address of relocated character generator (same addess as ROM version)
    CHARGEN:       file = "", define = yes, start = $E000, size = $0400;

# memory beneath the ROM
    HIDDEN_RAM:    file = "", define = yes, start = $E400, size = $FFFA - $E400;

# overlays
    OVL1:          file = "%O.1",           start = %S,                     size = __OVERLAYSIZE__;
    OVL2:          file = "%O.2",           start = %S,                     size = __OVERLAYSIZE__;
    OVL3:          file = "%O.3",           start = %S,                     size = __OVERLAYSIZE__;
    OVL4:          file = "%O.4",           start = %S,                     size = __OVERLAYSIZE__;
    OVL5:          file = "%O.5",           start = %S,                     size = __OVERLAYSIZE__;
    OVL6:          file = "%O.6",           start = %S,                     size = __OVERLAYSIZE__;
    OVL7:          file = "%O.7",           start = %S,                     size = __OVERLAYSIZE__;
    OVL8:          file = "%O.8",           start = %S,                     size = __OVERLAYSIZE__;
    OVL9:          file = "%O.9",           start = %S,                     size = __OVERLAYSIZE__;
}

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

    SYSCHKHDR:   load = SYSCHKHDR,                     type = ro,                optional = yes;
    SYSCHK:      load = SYSCHKCHNK,                    type = rw,  define = yes, optional = yes;
    SYSCHKTRL:   load = SYSCHKTRL,                     type = ro,                optional = yes;

    SRPREPHDR:   load = SRPREPHDR,                     type = ro;
    LOWBSS:      load = SRPREPCHNK,                    type = bss, define = yes;  # shared btw. SRPREPCHNK and RAM, not zero initialized
    SRPREP:      load = SRPREPCHNK,                    type = rw,  define = yes;
    SHADOW_RAM:  load = SRPREPCHNK, run = HIDDEN_RAM,  type = rw,  define = yes, optional = yes;
    SHADOW_RAM2: load = SRPREPCHNK, run = HIDDEN_RAM2, type = rw,  define = yes, optional = yes;
    SRPREPTRL:   load = SRPREPTRL,                     type = ro;

    MAINHDR:     load = MAINHDR,                       type = ro;
    STARTUP:     load = RAM,                           type = ro,  define = yes;
    LOWCODE:     load = RAM,                           type = ro,  define = yes, optional = yes;
    INIT:        load = RAM,                           type = ro,                optional = yes;
    CODE:        load = RAM,                           type = ro,  define = yes;
    RODATA:      load = RAM,                           type = ro;
    DATA:        load = RAM,                           type = rw;
    BSS:         load = RAM,                           type = bss, define = yes;
    ZEROPAGE:    load = ZP,                            type = zp;
    EXTZP:       load = ZP,                            type = zp,                optional = yes;
    AUTOSTRT:    load = TRAILER,                       type = ro;

    OVERLAY1:    load = OVL1,                          type = ro,  define = yes, optional = yes;
    OVERLAY2:    load = OVL2,                          type = ro,  define = yes, optional = yes;
    OVERLAY3:    load = OVL3,                          type = ro,  define = yes, optional = yes;
    OVERLAY4:    load = OVL4,                          type = ro,  define = yes, optional = yes;
    OVERLAY5:    load = OVL5,                          type = ro,  define = yes, optional = yes;
    OVERLAY6:    load = OVL6,                          type = ro,  define = yes, optional = yes;
    OVERLAY7:    load = OVL7,                          type = ro,  define = yes, optional = yes;
    OVERLAY8:    load = OVL8,                          type = ro,  define = yes, optional = yes;
    OVERLAY9:    load = OVL9,                          type = ro,  define = yes, optional = yes;
}
FEATURES {
    CONDES: type    = constructor,
            label   = __CONSTRUCTOR_TABLE__,
            count   = __CONSTRUCTOR_COUNT__,
            segment = INIT;
    CONDES: type    = destructor,
            label   = __DESTRUCTOR_TABLE__,
            count   = __DESTRUCTOR_COUNT__,
            segment = RODATA;
    CONDES: type    = interruptor,
            label   = __INTERRUPTOR_TABLE__,
            count   = __INTERRUPTOR_COUNT__,
            segment = RODATA,
            import  = __CALLIRQ__;
}