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Fix check whether there is enough memory btw. MEMLO and the program

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load address to move screen buffer there.
This commit is contained in:
Christian Groessler
2013-06-20 23:31:41 +02:00
parent 96b0ca0524
commit 6ed1b07e59
3 changed files with 101 additions and 30 deletions
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20
libsrc/atari/system_check.s
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@@ -90,27 +90,15 @@ is_xl: lda RAMSIZ
fail: jsr delay
jmp (DOSVEC)
lowadr: .res 2 ; lowest address we need in order to move screen memory down, depending on start address of program
; system is basically supported, check if there is enough space btw. MEMLO and our start address
; to move screen memory there
CMPVAL = 64+255+992 ; you may ask, why these values... @@@ document
sys_ok: lda #<__SAVEAREA_LOAD__
sec
sbc #<CMPVAL
sta lowadr
lda #>__SAVEAREA_LOAD__
sbc #>CMPVAL
sta lowadr+1
sys_ok:
.include "xlmemchk.inc"
sec
lda MEMLO
sbc lowadr
sbc tstadr2
lda MEMLO+1
sbc lowadr+1
sbc tstadr2+1
bcc memlo_ok
; load address was too low