mirror of
https://github.com/cc65/cc65.git
synced 2024-11-16 18:08:04 +00:00
164 lines
3.8 KiB
ArmAsm
164 lines
3.8 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 06.08.1998
|
|
;
|
|
; void cputcxy (unsigned char x, unsigned char y, char c);
|
|
; void cputc (char c);
|
|
;
|
|
|
|
.export _cputcxy, _cputc, cputdirect, putchar
|
|
.export newline, plot
|
|
.destructor setsyscursor
|
|
|
|
.import gotoxy
|
|
.import PLOT
|
|
|
|
.import ktmp: zp, crtc: zp, CURS_X: zp, CURS_Y: zp, RVS: zp
|
|
.import CharPtr: zp
|
|
|
|
.include "cbm610.inc"
|
|
|
|
|
|
_cputcxy:
|
|
pha ; Save C
|
|
jsr gotoxy ; Set cursor, drop x and y
|
|
pla ; Restore C
|
|
|
|
; Plot a character - also used as internal function
|
|
|
|
_cputc: cmp #$0A ; CR?
|
|
bne L1
|
|
lda #0
|
|
sta CURS_X
|
|
beq plot ; Recalculate pointers
|
|
|
|
L1: cmp #$0D ; LF?
|
|
beq newline ; Recalculate pointers
|
|
|
|
; Printable char of some sort
|
|
|
|
cmp #' '
|
|
bcc cputdirect ; Other control char
|
|
tay
|
|
bmi L10
|
|
cmp #$60
|
|
bcc L2
|
|
and #$DF
|
|
bne cputdirect ; Branch always
|
|
L2: and #$3F
|
|
|
|
cputdirect:
|
|
jsr putchar ; Write the character to the screen
|
|
|
|
; Advance cursor position
|
|
|
|
advance:
|
|
iny
|
|
cpy #XSIZE
|
|
bne L3
|
|
jsr newline ; new line
|
|
ldy #0 ; + cr
|
|
L3: sty CURS_X
|
|
rts
|
|
|
|
newline:
|
|
clc
|
|
lda #XSIZE
|
|
adc CharPtr
|
|
sta CharPtr
|
|
bcc L4
|
|
inc CharPtr+1
|
|
L4: inc CURS_Y
|
|
rts
|
|
|
|
; Handle character if high bit set
|
|
|
|
L10: and #$7F
|
|
cmp #$7F ; PI?
|
|
bne L11
|
|
lda #$5E ; Load screen code for PI
|
|
L11: ora #$40
|
|
bne cputdirect ; Branch always
|
|
|
|
; Write one character to the screen without doing anything else, return X
|
|
; position in Y
|
|
|
|
putchar:
|
|
ldx IndReg
|
|
ldy #$0F
|
|
sty IndReg
|
|
ora RVS ; Set revers bit
|
|
ldy CURS_X
|
|
sta (CharPtr),y ; Set char
|
|
stx IndReg
|
|
rts
|
|
|
|
; Set cursor position, calculate RAM pointers
|
|
|
|
plot: ldx CURS_Y
|
|
lda LineLSBTab,x
|
|
sta CharPtr
|
|
lda LineMSBTab,x
|
|
sta CharPtr+1
|
|
|
|
lda IndReg
|
|
pha
|
|
lda #$0F
|
|
sta IndReg
|
|
|
|
ldy #$00
|
|
clc
|
|
sei
|
|
sta (crtc),y
|
|
lda CharPtr
|
|
adc CURS_X
|
|
iny
|
|
sta (crtc),y
|
|
dey
|
|
lda #$0E
|
|
sta (crtc),y
|
|
iny
|
|
lda (crtc),y
|
|
and #$F8
|
|
sta ktmp
|
|
lda CharPtr+1
|
|
adc #$00
|
|
and #$07
|
|
ora ktmp
|
|
sta (crtc),y
|
|
cli
|
|
|
|
pla
|
|
sta IndReg
|
|
rts
|
|
|
|
; -------------------------------------------------------------------------
|
|
; Cleanup routine that sets the kernal cursor position to ours
|
|
|
|
.segment "PAGE2"
|
|
|
|
setsyscursor:
|
|
ldy CURS_X
|
|
ldx CURS_Y
|
|
clc
|
|
jmp PLOT ; Set the new cursor
|
|
|
|
; -------------------------------------------------------------------------
|
|
; Low bytes of the start address of the screen lines
|
|
|
|
.rodata
|
|
|
|
LineLSBTab:
|
|
.byte $00,$50,$A0,$F0,$40,$90,$E0,$30
|
|
.byte $80,$D0,$20,$70,$C0,$10,$60,$B0
|
|
.byte $00,$50,$A0,$F0,$40,$90,$E0,$30
|
|
.byte $80
|
|
; -------------------------------------------------------------------------
|
|
; High bytes of the start address of the screen lines
|
|
|
|
LineMSBTab:
|
|
.byte $D0,$D0,$D0,$D0,$D1,$D1,$D1,$D2
|
|
.byte $D2,$D2,$D3,$D3,$D3,$D4,$D4,$D4
|
|
.byte $D5,$D5,$D5,$D5,$D6,$D6,$D6,$D7
|
|
.byte $D7
|
|
|