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Squeeze 4 bytes out of the startup code

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git-svn-id: svn://svn.cc65.org/cc65/trunk@412 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2000-10-30 21:01:34 +00:00
parent 72e32b332b
commit e66b11770f
1 changed files with 8 additions and 9 deletions
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17
libsrc/c64/crt0.s
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@ -54,10 +54,10 @@ Head: .word @Next
; ------------------------------------------------------------------------
; Actual code
ldy #zpspace-1
L1: lda sp,y
sta zpsave,y ; Save the zero page locations we need
dey
ldx #zpspace-1
L1: lda sp,x
sta zpsave,x ; Save the zero page locations we need
dex
bpl L1
; Close open files
@ -80,7 +80,6 @@ L1: lda sp,y
lda $01
sta mmusave ; Save the memory configuration
lda $01
and #$F8
ora #$06 ; Enable kernal+I/O, disable basic
sta $01
@ -117,10 +116,10 @@ _exit: jsr doatexit ; call exit functions
; Copy back the zero page stuff
ldy #zpspace-1
L2: lda zpsave,y
sta sp,y
dey
ldx #zpspace-1
L2: lda zpsave,x
sta sp,x
dex
bpl L2
; Reset changed vectors, back to basic