-; 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
-
- .rodata
-
-; 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
-old_shflok: .res 1
-old_lmargin: .res 1
-
- .segment "AUTOSTRT"
- .word $02E0
- .word $02E1
- .word __CODE_LOAD__ + 1