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Add support to create cartridges.

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This commit is contained in:
Christian Groessler 2014-01-06 20:24:29 +01:00
parent b1c8f8e714
commit b237bb9d9a
4 changed files with 143 additions and 0 deletions
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43
cfg/atari-cart.cfg Normal file
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FEATURES {
STARTADDRESS: default = $2000;
}
SYMBOLS {
__CART_HEADER__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack
__STARTADDRESS__: type = export, value = %S;
__RESERVED_MEMORY__: type = export, value = $0000;
__CARTFLAGS__: type = weak, value = $01; # see documentation for other possible values
}
MEMORY {
ZP: file = "", define = yes, start = $0082, size = $007E;
RAM: file = "", define = yes, start = %S, size = $2000;
ROM: file = %O, define = yes, start = $A000, size = $1FFA, fill = yes, fillval = $ff;
CARTID: file = %O, start = $BFFA, size = $0006;
}
SEGMENTS {
STARTUP: load = ROM, type = ro, define = yes;
LOWCODE: load = ROM, type = ro, define = yes, optional = yes;
INIT: load = ROM, type = ro, optional = yes;
CODE: load = ROM, type = ro, define = yes;
RODATA: load = ROM, type = ro;
DATA: load = ROM, run = RAM, type = rw, define = yes;
BSS: load = RAM, type = bss, define = yes;
CARTHDR: load = CARTID, type = ro;
ZEROPAGE: load = ZP, type = zp;
EXTZP: load = ZP, type = zp, 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__;
}

20
libsrc/atari/carthdr.s Normal file
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; Cartridge "header"
; (In fact, it's at the end of the cartridge, so more a "trailer".)
;
; Christian Groessler, 06-Jan-2014
.ifndef __ATARIXL__
.import __CARTFLAGS__, cartinit, cartstart
.export __CART_HEADER__: absolute = 1
.include "atari.inc"
.segment "CARTHDR"
.word cartstart ; start routine
.byte 0 ; must be zero
.byte <__CARTFLAGS__
.word cartinit ; init routine
.endif ; .ifndef __ATARIXL__

13
libsrc/atari/cartinit.s Normal file
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; Cartridge init routine
;
; Christian Groessler, 06-Jan-2014
.ifndef __ATARIXL__
.export cartinit
.segment "STARTUP"
cartinit: rts
.endif ; .ifndef __ATARIXL__

67
libsrc/atari/cartstart.s Normal file
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; Cartridge start routine
;
; Christian Groessler, 06-Jan-2014
.ifndef __ATARIXL__
.export cartstart
.import start
.import __DATA_LOAD__, __DATA_SIZE__, __DATA_RUN__
.importzp ptr1, ptr2, tmp1, tmp2
.include "atari.inc"
.segment "STARTUP"
; start routine of cartridge
; copy data segment to RAM and chain to entry point of crt0.s
cartstart: lda #<__DATA_LOAD__
sta ptr1
lda #>__DATA_LOAD__
sta ptr1+1
lda #<__DATA_RUN__
sta ptr2
lda #>__DATA_RUN__
sta ptr2+1
lda #>__DATA_SIZE__
sta tmp2
lda #<__DATA_SIZE__
sta tmp1
jsr memcopy
jsr start ; run program
jmp (DOSVEC) ; return to DOS
; routine taken from http://www.obelisk.demon.co.uk/6502/algorithms.html
;
; copy memory
; ptr1 - source
; ptr2 - destination
; tmp2:tmp1 - len
.proc memcopy
ldy #0
ldx tmp2
beq last
pagecp: lda (ptr1),y
sta (ptr2),y
iny
bne pagecp
inc ptr1+1
inc ptr2+1
dex
bne pagecp
last: cpy tmp1
beq done
lda (ptr1),y
sta (ptr2),y
iny
bne last
done: rts
.endproc
.endif ; .ifndef __ATARIXL__