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adapt reserved memory with _graphmode_used variable (user settable)

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git-svn-id: svn://svn.cc65.org/cc65/trunk@124 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cpg 2000-06-25 01:45:30 +00:00
parent 4a27cbd9a7
commit 6f05785aa9
1 changed files with 89 additions and 7 deletions
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96
libsrc/atari/crt0.s
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@ -14,6 +14,7 @@
.import __hinit, initconio, zerobss, pushax, doatexit
.import _main,__filetab,getfd
.import __CODE_LOAD__, __BSS_LOAD__
.import __graphmode_used
.include "atari.inc"
@ -83,13 +84,13 @@ L1: lda sp,y
sta appmsav
lda APPMHI+1
sta appmsav+1
jsr getmemtop ; adjust for graphics mode to use
lda #<$8000
sta sp
sta APPMHI
lda #>$8000
sta sp+1 ; Set argument stack ptr
sta APPMHI+1
stx sp+1 ; Set argument stack ptr
stx APPMHI+1
; set left margin to 0
@ -177,11 +178,92 @@ L2: lda zpsave,y
rts
.data
; *** end of main startup code
; calc. upper memory limit to use
.proc getmemtop
ldy __graphmode_used
beq ignore ; mode 0 doesn't need adjustment
cpy #32
bcs ignore ; invalid value
tya
asl a
tay
lda MEMTOP
sec
sbc grmemusage,y
pha
lda MEMTOP+1
sbc grmemusage+1,y
tax
pla
rts
ignore: lda MEMTOP
ldx MEMTOP+1
rts
.endproc
.data
zpsave: .res zpspace
.bss
; memory usage of the different graphics modes (0-31)
; values < 0 of "bytes needed" are mappped to 0
; bytes needed ; mode ; val. of MEMTOP
grmemusage:
.word 0 ; 0 ; 39967
.word 0 ;-318 ; 1 ; 40285
.word 0 ;-568 ; 2 ; 40535
.word 0 ;-558 ; 3 ; 40525
.word 0 ;-298 ; 4 ; 40265
.word 182 ; 5 ; 39785
.word 1182 ; 6 ; 38785
.word 3198 ; 7 ; 36769
.word 7120 ; 8 ; 32847
.word 7146 ; 9 ; 32821
.word 7146 ; 10 ; 32821
.word 7146 ; 11 ; 32821
.word 162 ; 12 ; 39805
.word 0 ;-328 ; 13 ; 40295
.word 3278 ; 14 ; 36689
.word 7120 ; 15 ; 32847
.word 0 ; 16 ; 39967
.word 0 ;-320 ; 17 ; 40287
.word 0 ;-572 ; 18 ; 40539
.word 0 ;-560 ; 19 ; 40527
.word 0 ;-296 ; 20 ; 40263
.word 184 ; 21 ; 39783
.word 1192 ; 22 ; 38775
.word 3208 ; 23 ; 36759
.word 7146 ; 24 ; 32821
.word 7146 ; 25 ; 32821
.word 7146 ; 26 ; 32821
.word 7146 ; 27 ; 32821
.word 160 ; 28 ; 39807
.word 0 ;-332 ; 29 ; 40299
.word 3304 ; 30 ; 36663
.word 7146 ; 31 ; 32821
; the program used to get these values (Atari BASIC):
; 100 FILE=0
; 110 IF FILE=1 THEN OPEN #1,8,0,"D:FREEMEM.OUT"
; 120 IF FILE<>1 THEN OPEN #1,8,0,"E:"
; 200 DIM G(32)
; 210 FOR I=0 TO 32:GRAPHICS I:GOSUB 1000:G(I)=VAL:NEXT I
; 220 GRAPHICS 0
; 230 FOR I=0 TO 31:PRINT #1;I;":",G(I);" - ";G(0)-G(I):NEXT I
; 240 CLOSE #1
; 999 END
; 1000 VAL=PEEK(741)+256*PEEK(742)
; 1010 RETURN
.bss
spsave: .res 1
appmsav: .res 1