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use __RESERVED_MEMORY__ to reserve memory for the default 20x24 text screen
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@ -1,14 +1,15 @@
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SYMBOLS {
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__CARTSIZE__: type = weak, value = $4000; # possible values: $4000 and $8000
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__CART_ENTRY__: type = import;
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__STACKSIZE__: type = weak, value = $0300; # 3 pages stack
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__CARTSIZE__: type = weak, value = $4000; # possible values: $4000 and $8000
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__CART_ENTRY__: type = import;
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__STACKSIZE__: type = weak, value = $0400; # 4 pages stack
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__RESERVED_MEMORY__: type = export, value = $0200; # space for display list and 20x24 screen buffer
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}
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MEMORY {
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ZP: file = "", start = $0019, size = $00E7, define = yes;
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RAM: file = "", start = $021C, size = $4000 - __STACKSIZE__ - $021C, define = yes;
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ROM: file = %O, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - $18, define = yes, fill = yes, fillval = $FF;
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CARTNAME: file = %O, start = $BFE8, size = $0014 fill = yes, fillval = $40;
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CARTYEAR: file = %O, start = $BFFC, size = $0002 fill = yes, fillval = $59;
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ZP: file = "", start = $0019, size = $00E7, define = yes;
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RAM: file = "", start = $021C, size = $4000 - __STACKSIZE__ - __RESERVED_MEMORY__ - $021C, define = yes;
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ROM: file = %O, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - $18, define = yes, fill = yes, fillval = $FF;
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CARTNAME: file = %O, start = $BFE8, size = $0014 fill = yes, fillval = $40;
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CARTYEAR: file = %O, start = $BFFC, size = $0002 fill = yes, fillval = $59;
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CARTENTRY: file = %O, start = $BFFE, size = $0002;
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}
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SEGMENTS {
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@ -6,8 +6,8 @@
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.export _exit, start
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.export __STARTUP__ : absolute = 1 ; Mark as startup
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.import __RAM_START__, __RAM_SIZE__
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.import __RESERVED_MEMORY__
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.import __RAM_START__, __RAM_SIZE__
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.import __RESERVED_MEMORY__
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.import initlib, donelib, callmain
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.import zerobss, copydata
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@ -32,9 +32,9 @@ start:
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; setup the stack
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lda #<(__RAM_START__ + __RAM_SIZE__)
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lda #<(__RAM_START__ + __RAM_SIZE__ - __RESERVED_MEMORY__)
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sta sp
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lda #>(__RAM_START__ + __RAM_SIZE__)
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lda #>(__RAM_START__ + __RAM_SIZE__ - __RESERVED_MEMORY__)
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sta sp+1 ; Set argument stack ptr
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; Call module constructors
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