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improved handling of cursor display and position

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1483 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg 2002-11-03 22:54:52 +00:00
parent b304f04cc0
commit e8afafce78
1 changed files with 27 additions and 1 deletions
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28
libsrc/atari/cputc.s
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@ -45,8 +45,15 @@ L4: cmp #$0A ; LF
cputdirect: ; accepts screen code
jsr putchar
lda OLDADR ; update cursor position pointer
clc
adc #1
sta OLDADR
bcc l1
inc OLDADR+1
; advance cursor
inc COLCRS
l1: inc COLCRS
lda COLCRS
cmp #40
bcc plot
@ -65,8 +72,14 @@ plot: ldy COLCRS
ldx ROWCRS
rts
; turn off cursor, update screen, turn on cursor
putchar:
pha ; save char
ldy #0
lda OLDCHR
sta (OLDADR),y
lda ROWCRS
jsr mul40
L3: clc
@ -76,9 +89,22 @@ L3: clc
adc SAVMSC+1
sta ptr4+1
pla ; get char again
sta OLDCHR
ora _revflag
ldy COLCRS
sta (ptr4),y
sty tmp4
lda ptr4
clc
adc tmp4
sta OLDADR
lda ptr4+1
adc #0
sta OLDADR+1
rts
.rodata