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add support for 16K cartridges

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This commit is contained in:
Christian Groessler 2014-01-17 20:08:41 +01:00
parent 2e44abf928
commit 40e49074a4
2 changed files with 8 additions and 5 deletions
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9
cfg/atari-cart.cfg
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@ -2,6 +2,7 @@ FEATURES {
STARTADDRESS: default = $2000; STARTADDRESS: default = $2000;
} }
SYMBOLS { SYMBOLS {
__CARTSIZE__: type = weak, value = $2000; # possible values: $2000 and $4000
__CART_HEADER__: type = import; __CART_HEADER__: type = import;
__STACKSIZE__: type = weak, value = $0800; # 2k stack __STACKSIZE__: type = weak, value = $0800; # 2k stack
__STARTADDRESS__: type = export, value = %S; __STARTADDRESS__: type = export, value = %S;
@ -9,10 +10,10 @@ SYMBOLS {
__CARTFLAGS__: type = weak, value = $01; # see documentation for other possible values __CARTFLAGS__: type = weak, value = $01; # see documentation for other possible values
} }
MEMORY { MEMORY {
ZP: file = "", define = yes, start = $0082, size = $007E; ZP: file = "", define = yes, start = $0082, size = $007E;
RAM: file = "", define = yes, start = %S, size = $2000; RAM: file = "", define = yes, start = %S, size = __CARTSIZE__;
ROM: file = %O, define = yes, start = $A000, size = $1FFA, fill = yes, fillval = $FF; ROM: file = %O, define = yes, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - 6, fill = yes, fillval = $FF;
CARTID: file = %O, start = $BFFA, size = $0006; CARTID: file = %O, start = $BFFA, size = $0006;
} }
SEGMENTS { SEGMENTS {
STARTUP: load = ROM, type = ro, define = yes, optional = yes; STARTUP: load = ROM, type = ro, define = yes, optional = yes;

4
libsrc/atari/carthdr.s
View file

@ -5,7 +5,7 @@
.ifndef __ATARIXL__ .ifndef __ATARIXL__
.import __CARTFLAGS__, cartinit, cartstart .import __CARTSIZE__, __CARTFLAGS__, cartinit, cartstart
.export __CART_HEADER__: absolute = 1 .export __CART_HEADER__: absolute = 1
.include "atari.inc" .include "atari.inc"
@ -17,4 +17,6 @@
.byte <__CARTFLAGS__ .byte <__CARTFLAGS__
.word cartinit ; init routine .word cartinit ; init routine
.assert (__CARTSIZE__ = $2000 || __CARTSIZE__ = $4000), error, "Cartridge size must either be $2000 or $4000"
.endif ; .ifndef __ATARIXL__ .endif ; .ifndef __ATARIXL__