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SCREEN_PTR does only contain the offset apparently (unlike on other cbm systems), so we need extra handling

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This commit is contained in:
mrdudz
2025-06-25 05:13:09 +02:00
parent 955c6627c0
commit 4db5ac6c14
13 changed files with 356 additions and 36 deletions
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45
libsrc/c65/cpeekc.s Normal file
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@@ -0,0 +1,45 @@
;
; 2016-02-28, Groepaz
; 2017-06-22, Greg King
;
; char cpeekc (void);
;
.include "c65.inc"
.export _cpeekc
.importzp ptr1
_cpeekc:
lda SCREEN_PTR + 1
clc
adc #>$0800
sta ptr1 + 1
lda SCREEN_PTR
sta ptr1
ldy CURS_X
lda (ptr1),y ; get screen code
ldx #>$0000
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
bcs @sk1 ;(bge)
ora #$40
rts
@sk1: cmp #$40
bcc @end ;(blt)
cmp #$60
bcc @sk2 ;(blt)
;sec
adc #$20 - $01
@sk2: ;clc ; both above cmp and adc clear carry flag
adc #$20
@end: rts

25
libsrc/c65/cpeekcolor.s Normal file
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@@ -0,0 +1,25 @@
;
; 2016-02-28, Groepaz
; 2017-06-22, Greg King
;
; unsigned char cpeekcolor (void);
;
.include "c65.inc"
.export _cpeekcolor
.importzp ptr1
_cpeekcolor:
lda SCREEN_PTR + 1
clc
adc #>$D800
sta ptr1 + 1
lda SCREEN_PTR
sta ptr1
ldy #0
lda (ptr1),y
ldx #>$0000
rts

80
libsrc/c65/cpeeks.s Normal file
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@@ -0,0 +1,80 @@
;
; 2017-07-05, Greg King
;
; void cpeeks (char* s, unsigned length);
;
.include "c65.inc"
.export _cpeeks
.import popax
.importzp ptr1, ptr2, ptr3, tmp1, tmp2
.macpack generic
_cpeeks:
eor #<$FFFF ; counting a word upward is faster
sta ptr3 ; so, we use -(length + 1)
txa
eor #>$FFFF
sta ptr3+1
lda SCREEN_PTR
sta ptr2
lda SCREEN_PTR+1
clc
adc #>$0800
sta ptr2+1
ldy CURS_X
sty tmp2
jsr popax
sta tmp1 ; (will be a .Y index)
stx ptr1+1
ldx #<$0000
stx ptr1
bze L3 ; branch always
L4: ldy tmp2
lda (ptr2),y ; get char
iny
bnz L2
inc ptr2+1
L2: sty tmp2
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 L5
cmp #$60
blt @sk2 ;(bcc)
clc
@sk1: adc #$20
@sk2: ;clc ; both above cmp and adc clear carry flag
adc #$20
L5: ldy tmp1
sta (ptr1),y
iny
bnz L1
inc ptr1+1
L1: sty tmp1
L3: inc ptr3 ; count length
bnz L4
inc ptr3+1
bnz L4
txa ; terminate the string
ldy tmp1
sta (ptr1),y
rts

24
libsrc/c65/cputc.s
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@@ -96,23 +96,25 @@ plot: ldy CURS_X
putchar: putchar:
ora RVS ; Set revers bit ora RVS ; Set revers bit
ldy CURS_X
pha tay
lda SCREEN_PTR + 1 lda SCREEN_PTR + 1
clc clc
adc #>$0800 adc #>$0800
sta SCREEN_PTR + 1 sta ptr4 + 1
pla lda SCREEN_PTR
sta ptr4
tya
sta (SCREEN_PTR),y ; Set char ldy CURS_X
sta (ptr4),y ; Set char
lda SCREEN_PTR + 1 lda ptr4 + 1
sec clc
sbc #>$0800 adc #>$d000
sta SCREEN_PTR + 1 sta ptr4 + 1
lda CHARCOLOR lda CHARCOLOR
; lda #$88 sta (ptr4),y ; Set color
; sta (CRAM_PTR),y ; Set color
rts rts

4
libsrc/cbm/cpeekc.s
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@@ -22,10 +22,6 @@
.include "pet.inc" .include "pet.inc"
.elseif .def(__VIC20__) .elseif .def(__VIC20__)
.include "vic20.inc" .include "vic20.inc"
.elseif .def(__C65__)
.include "c65.inc"
.elseif .def(__MEGA65__)
.include "mega65.inc"
.endif .endif

4
libsrc/cbm/cpeekcolor.s
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@@ -17,10 +17,6 @@
.include "c64.inc" .include "c64.inc"
.elseif .def(__VIC20__) .elseif .def(__VIC20__)
.include "vic20.inc" .include "vic20.inc"
.elseif .def(__C65__)
.include "c65.inc"
.elseif .def(__MEGA65__)
.include "mega65.inc"
.endif .endif

4
libsrc/cbm/cpeeks.s
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@@ -26,10 +26,6 @@
.include "pet.inc" .include "pet.inc"
.elseif .def(__VIC20__) .elseif .def(__VIC20__)
.include "vic20.inc" .include "vic20.inc"
.elseif .def(__C65__)
.include "c65.inc"
.elseif .def(__MEGA65__)
.include "mega65.inc"
.endif .endif

45
libsrc/mega65/cpeekc.s Normal file
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@@ -0,0 +1,45 @@
;
; 2016-02-28, Groepaz
; 2017-06-22, Greg King
;
; char cpeekc (void);
;
.include "mega65.inc"
.export _cpeekc
.importzp ptr1
_cpeekc:
lda SCREEN_PTR + 1
clc
adc #>$0800
sta ptr1 + 1
lda SCREEN_PTR
sta ptr1
ldy CURS_X
lda (ptr1),y ; get screen code
ldx #>$0000
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
bcs @sk1 ;(bge)
ora #$40
rts
@sk1: cmp #$40
bcc @end ;(blt)
cmp #$60
bcc @sk2 ;(blt)
;sec
adc #$20 - $01
@sk2: ;clc ; both above cmp and adc clear carry flag
adc #$20
@end: rts

25
libsrc/mega65/cpeekcolor.s Normal file
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@@ -0,0 +1,25 @@
;
; 2016-02-28, Groepaz
; 2017-06-22, Greg King
;
; unsigned char cpeekcolor (void);
;
.include "mega65.inc"
.export _cpeekcolor
.importzp ptr1
_cpeekcolor:
lda SCREEN_PTR + 1
clc
adc #>$d800
sta ptr1 + 1
lda SCREEN_PTR
sta ptr1
ldy CURS_X
lda (ptr1),y
ldx #>$0000
rts

28
libsrc/mega65/cpeekrevers.s Normal file
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@@ -0,0 +1,28 @@
;
; 2016-02-28, Groepaz
; 2017-06-15, Greg King
;
; unsigned char cpeekrevers (void);
;
.include "mega65.inc"
.export _cpeekrevers
.importzp ptr1
_cpeekrevers:
lda SCREEN_PTR + 1
clc
adc #>$0800
sta ptr1 + 1
lda SCREEN_PTR
sta ptr1
ldy CURS_X
lda (ptr1),y ; get screen code
and #$80 ; get reverse bit
asl a
tax ; ldx #>$0000
rol a ; return boolean value
rts

80
libsrc/mega65/cpeeks.s Normal file
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@@ -0,0 +1,80 @@
;
; 2017-07-05, Greg King
;
; void cpeeks (char* s, unsigned length);
;
.include "c65.inc"
.export _cpeeks
.import popax
.importzp ptr1, ptr2, ptr3, tmp1, tmp2
.macpack generic
_cpeeks:
eor #<$FFFF ; counting a word upward is faster
sta ptr3 ; so, we use -(length + 1)
txa
eor #>$FFFF
sta ptr3+1
lda SCREEN_PTR
sta ptr2
lda SCREEN_PTR+1
clc
adc #>$0800
sta ptr2+1
ldy CURS_X
sty tmp2
jsr popax
sta tmp1 ; (will be a .Y index)
stx ptr1+1
ldx #<$0000
stx ptr1
bze L3 ; branch always
L4: ldy tmp2
lda (ptr2),y ; get char
iny
bnz L2
inc ptr2+1
L2: sty tmp2
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 L5
cmp #$60
blt @sk2 ;(bcc)
clc
@sk1: adc #$20
@sk2: ;clc ; both above cmp and adc clear carry flag
adc #$20
L5: ldy tmp1
sta (ptr1),y
iny
bnz L1
inc ptr1+1
L1: sty tmp1
L3: inc ptr3 ; count length
bnz L4
inc ptr3+1
bnz L4
txa ; terminate the string
ldy tmp1
sta (ptr1),y
rts

26
libsrc/mega65/cputc.s
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@@ -9,10 +9,10 @@
.export newline, plot .export newline, plot
.import gotoxy .import gotoxy
.import PLOT .import PLOT
.importzp ptr4
.include "mega65.inc" .include "mega65.inc"
_cputcxy: _cputcxy:
pha ; Save C pha ; Save C
jsr gotoxy ; Set cursor, drop x and y jsr gotoxy ; Set cursor, drop x and y
@@ -96,23 +96,25 @@ plot: ldy CURS_X
putchar: putchar:
ora RVS ; Set revers bit ora RVS ; Set revers bit
ldy CURS_X
pha tay
lda SCREEN_PTR + 1 lda SCREEN_PTR + 1
clc clc
adc #>$0800 adc #>$0800
sta SCREEN_PTR + 1 sta ptr4 + 1
pla lda SCREEN_PTR
sta ptr4
tya
sta (SCREEN_PTR),y ; Set char ldy CURS_X
sta (ptr4),y ; Set char
lda SCREEN_PTR + 1 lda ptr4 + 1
sec clc
sbc #>$0800 adc #>$d000
sta SCREEN_PTR + 1 sta ptr4 + 1
lda CHARCOLOR lda CHARCOLOR
; lda #$88 sta (ptr4),y ; Set color
; sta (CRAM_PTR),y ; Set color
rts rts

2
libsrc/mega65/kbhit.s
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@@ -19,6 +19,6 @@ _kbhit:
lda #1 lda #1
: :
ldx #0 ldx #>$0000
rts rts