mirror of
https://github.com/cc65/cc65.git
synced 2024-12-23 04:30:10 +00:00
fix cpeeks() for C128 VDC
This commit is contained in:
parent
4da22fc6a0
commit
892732f340
@ -1,5 +1,6 @@
|
||||
;
|
||||
; 2017-07-05, Greg King
|
||||
; 2017-12-12, Groepaz
|
||||
;
|
||||
; void cpeeks (char* s, unsigned length);
|
||||
;
|
||||
@ -22,6 +23,9 @@ _cpeeks:
|
||||
eor #>$FFFF
|
||||
sta ptr3+1
|
||||
|
||||
lda MODE
|
||||
bmi c80
|
||||
|
||||
lda SCREEN_PTR
|
||||
ldx SCREEN_PTR+1
|
||||
sta ptr2
|
||||
@ -77,3 +81,79 @@ L3: inc ptr3 ; count length
|
||||
ldy tmp1
|
||||
sta (ptr1),y
|
||||
rts
|
||||
|
||||
;-----------------------------------------------------------
|
||||
c80:
|
||||
lda SCREEN_PTR
|
||||
clc
|
||||
adc CURS_X
|
||||
sta ptr2
|
||||
lda SCREEN_PTR+1
|
||||
adc #0
|
||||
sta ptr2+1
|
||||
|
||||
jsr popax
|
||||
sta tmp1 ; (will be a .Y index)
|
||||
stx ptr1+1
|
||||
ldx #<$0000
|
||||
stx ptr1
|
||||
bze L3a ; branch always
|
||||
|
||||
L4a:
|
||||
lda ptr2
|
||||
ldy ptr2+1
|
||||
inc ptr2
|
||||
bne @s
|
||||
inc ptr2+1
|
||||
@s:
|
||||
; get byte from VDC mem
|
||||
ldx #VDC_DATA_LO
|
||||
stx VDC_INDEX
|
||||
@L0: bit VDC_INDEX
|
||||
bpl @L0
|
||||
sta VDC_DATA
|
||||
dex
|
||||
stx VDC_INDEX
|
||||
sty VDC_DATA
|
||||
|
||||
ldx #VDC_RAM_RW
|
||||
stx VDC_INDEX
|
||||
@L1: bit VDC_INDEX
|
||||
bpl @L1 ; wait for blanking
|
||||
lda VDC_DATA
|
||||
|
||||
and #<~$80 ; remove reverse bit
|
||||
|
||||
; Convert the screen code into a PetSCII code.
|
||||
; $00 - $1F: +$40
|
||||
; $20 - $3F
|
||||
; $40 - $5f: +$20
|
||||
; $60 - $7F: +$40
|
||||
|
||||
cmp #$20
|
||||
blt @sk1 ;(bcc)
|
||||
cmp #$40
|
||||
blt L5a
|
||||
cmp #$60
|
||||
blt @sk2 ;(bcc)
|
||||
clc
|
||||
@sk1: adc #$20
|
||||
@sk2: ;clc ; both above cmp and adc clear carry flag
|
||||
adc #$20
|
||||
|
||||
L5a: ldy tmp1
|
||||
sta (ptr1),y
|
||||
iny
|
||||
bnz L1a
|
||||
inc ptr1+1
|
||||
L1a: sty tmp1
|
||||
|
||||
L3a: inc ptr3 ; count length
|
||||
bnz L4a
|
||||
inc ptr3+1
|
||||
bnz L4a
|
||||
|
||||
lda #0 ; terminate the string
|
||||
ldy tmp1
|
||||
sta (ptr1),y
|
||||
rts
|
||||
|
Loading…
Reference in New Issue
Block a user