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atari5200: put default display list into its own memory area

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This avoids 1K boundary crossing of the display list. Fix for issue #560.
This commit is contained in:
Christian Groessler 2018-01-19 15:18:43 +01:00
parent 811424cc1b
commit 2ef6514e47
2 changed files with 13 additions and 7 deletions
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15
cfg/atari5200.cfg
View File

@ -1,16 +1,18 @@
SYMBOLS {
__CARTSIZE__: type = weak, value = $4000; # possible values: $4000 and $8000
__DLISTSIZE__: type = weak, value = $0000;
__CART_ENTRY__: type = import;
__STACKSIZE__: type = weak, value = $0400; # 4 pages stack
__RESERVED_MEMORY__: type = export, value = $01E0; # space for 20x24 screen buffer (default display list is in ROM)
}
MEMORY {
ZP: file = "", start = $001D, size = $00E3, define = yes;
RAM: file = "", start = $021C, size = $4000 - __STACKSIZE__ - __RESERVED_MEMORY__ - $021C, define = yes;
ROM: file = %O, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - $18, define = yes, fill = yes, fillval = $FF;
CARTNAME: file = %O, start = $BFE8, size = $0014 fill = yes, fillval = $40;
CARTYEAR: file = %O, start = $BFFC, size = $0002 fill = yes, fillval = $59;
CARTENTRY: file = %O, start = $BFFE, size = $0002;
ZP: file = "", start = $001D, size = $00E3, define = yes;
RAM: file = "", start = $021C, size = $4000 - __STACKSIZE__ - __RESERVED_MEMORY__ - $021C, define = yes;
ROM: file = %O, start = $C000 - __CARTSIZE__, size = __CARTSIZE__ - __DLISTSIZE__ - $18, define = yes, fill = yes, fillval = $FF;
DLIST: file = %O, start = $BFE8 - __DLISTSIZE__, size = __DLISTSIZE__;
CARTNAME: file = %O, start = $BFE8, size = $0014 fill = yes, fillval = $40;
CARTYEAR: file = %O, start = $BFFC, size = $0002 fill = yes, fillval = $59;
CARTENTRY: file = %O, start = $BFFE, size = $0002;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp, optional = yes;
@ -22,6 +24,7 @@ SEGMENTS {
RODATA: load = ROM, type = ro, optional = yes;
DATA: load = ROM, run = RAM, type = rw, define = yes, optional = yes;
BSS: load = RAM, type = bss, define = yes, optional = yes;
DLIST: load = DLIST, type = ro, define = yes, optional = yes;
CARTNAME: load = CARTNAME, type = ro, define = yes;
CARTYEAR: load = CARTYEAR, type = ro, define = yes;
CARTENTRY: load = CARTENTRY, type = ro, define = yes;

5
libsrc/atari5200/conioscreen.s
View File

@ -58,7 +58,7 @@ clrscr: sta (SAVMSC),y
rts
.segment "RODATA"
.segment "DLIST"
; display list for 20x24 text mode
@ -78,6 +78,9 @@ dlist: .repeat 3
; end of display list
.export __DLISTSIZE__
__DLISTSIZE__ = * - dlist
.assert ((* >> 10) = (dlist >> 10)), error, "Display list crosses 1K boundary"
.end