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Being loaded by my 'ProDOS Loader' needs to be classified as being loaded as BIN from an interpreter (and not as SYS). But the 'ProDOS Loader' zeros the system bitmap up to the system global page (this is what it's about) so additionally check page $03 protection which is zero when loaded as SYS but one when loaded by 'ProDOS Loader 1.4'.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4168 b7a2c559-68d2-44c3-8de9-860c34a00d81
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ol.sc 2009-09-13 19:50:09 +00:00
parent 4b84d95891
commit b7df1ed5d4
1 changed files with 5 additions and 1 deletions
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libsrc/apple2/crt0.s
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@ -165,8 +165,12 @@ init: ldx #zpspace-1
bne basic
; Check ProDOS system bit map
lda $BF58 ; protection for pages $00 - $07
and #%11110000 ; ignore protection of text pages
cmp #%11000000 ; only zero and stack pages are protected
bne basic
lda $BF6F ; protection for pages $B8 - $BF
cmp #%00000001 ; exactly page $BF is protected
cmp #%00000001 ; exactly system global page is protected
bne basic
; No BASIC.SYSTEM so quit to ProDOS dispatcher instead