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Atari: initial support to create cassette bootable programs -- unfinished
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cfg/atari-cassette.cfg
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53
cfg/atari-cassette.cfg
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FEATURES {
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STARTADDRESS: default = $1000;
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}
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SYMBOLS {
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_cas_init: type = import;
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__STACKSIZE__: type = weak, value = $0800; # 2k stack
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__STARTADDRESS__: type = export, value = %S;
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__RESERVED_MEMORY__: type = weak, value = $0000;
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}
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MEMORY {
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ZP: file = "", define = yes, start = $0082, size = $007E;
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# file header, just $FFFF
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# HEADER: file = "", start = $0000, size = $0002;
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# CASHDR: file = %O, start = $3FD, size = 128, fill = yes;
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CASHDR: file = %O, start = $0, size = 6;
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# "main program" load chunk
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# MAINHDR: file = "", start = $0000, size = $0004;
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RAM: file = %O, define = yes, start = %S, size = $BC20 - __STACKSIZE__ - __RESERVED_MEMORY__ - %S;
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# TRAILER: file = "", start = $0000, size = $0006;
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}
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SEGMENTS {
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# EXEHDR: load = HEADER, type = ro;
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# MAINHDR: load = MAINHDR, type = ro;
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CASHDR: load = CASHDR, type = ro;
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CASINIT: load = RAM, type = ro;
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STARTUP: load = RAM, type = ro, define = yes;
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LOWCODE: load = RAM, type = ro, define = yes, optional = yes;
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INIT: load = RAM, type = ro, optional = yes;
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CODE: load = RAM, type = ro, define = yes;
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RODATA: load = RAM, type = ro;
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DATA: load = RAM, type = rw;
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BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = zp;
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EXTZP: load = ZP, type = zp, optional = yes;
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# AUTOSTRT: load = TRAILER, type = ro;
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}
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FEATURES {
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CONDES: type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__,
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segment = INIT;
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CONDES: type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__,
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segment = RODATA;
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CONDES: type = interruptor,
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label = __INTERRUPTOR_TABLE__,
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count = __INTERRUPTOR_COUNT__,
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segment = RODATA,
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import = __CALLIRQ__;
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}
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40
libsrc/atari/cashdr.s
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40
libsrc/atari/cashdr.s
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;
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; Cassette boot file header
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;
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; Christian Groessler, chris@groessler.org, 2013
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;
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.ifndef __ATARIXL__
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.include "atari.inc"
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.import __BSS_RUN__, __STARTADDRESS__, start
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.export _cas_init
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.segment "CASHDR"
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.byte 0 ; ignored
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.byte <((__BSS_RUN__ - __STARTADDRESS__ + 127 + 6) / 128)
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.word __STARTADDRESS__
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.word _cas_init
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.segment "CASINIT"
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lda #33
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ldy #80
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sta (SAVMSC),y
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clc
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rts
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_cas_init:
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lda #34
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ldy #81
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sta (SAVMSC),y
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lda #<start
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sta DOSVEC
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lda #>start
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sta DOSVEC+1
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rts
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.endif ; .ifdef __ATARIXL__
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