; void cputc (char c);
;
- .export _cputcxy, _cputc, cputdirect, putchar
- .export newline, plot
- .import popa, _gotoxy
- .import xsize, revers
+ .export _cputcxy, _cputc, cputdirect, putchar
+ .export newline, plot
+ .import gotoxy
+ .import PLOT
+
+ .include "plus4.inc"
- .include "plus4.inc"
- .include "../cbm/cbm.inc"
_cputcxy:
- pha ; Save C
- jsr popa ; Get Y
- jsr _gotoxy ; Set cursor, drop x
- pla ; Restore C
+ 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
+_cputc: cmp #$0A ; CR?
+ bne L1
+ lda #0
+ sta CURS_X
+ beq plot ; Recalculate pointers
-L1: cmp #$0D ; LF?
- bne L2
- ldy CURS_Y
- iny
- bne newline ; Recalculate pointers
+L1: cmp #$0D ; LF?
+ beq newline ; Recalculate pointers
; Printable char of some sort
-L2: cmp #' '
- bcc cputdirect ; Other control char
- tay
- bmi L10
- cmp #$60
- bcc L3
- and #$DF
- bne cputdirect ; Branch always
-L3: and #$3F
+ 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
+ jsr putchar ; Write the character to the screen
; Advance cursor position
advance:
- iny
- cpy xsize
- bne L9
+ iny
+ cpy #XSIZE
+ bne L3
+ jsr newline ; new line
+ ldy #0 ; + cr
+L3: sty CURS_X
+ rts
+
newline:
- ldy #0 ; new line
- clc
- lda xsize
- adc SCREEN_PTR
- sta SCREEN_PTR
- bcc L4
- inc SCREEN_PTR+1
- clc
-L4: lda xsize
- adc CRAM_PTR
- sta CRAM_PTR
- bcc L5
- inc CRAM_PTR+1
-L5: inc CURS_Y
-L9: sty CURS_X
- rts
+ clc
+ lda #XSIZE
+ adc SCREEN_PTR
+ sta SCREEN_PTR
+ bcc L4
+ inc SCREEN_PTR+1
+ clc
+L4: lda #XSIZE
+ adc CRAM_PTR
+ sta CRAM_PTR
+ bcc L5
+ inc CRAM_PTR+1
+L5: inc CURS_Y
+ rts
; Handle character if high bit set
-L10: and #$7F
- cmp #$7E ; PI?
- bne L11
- lda #$5E ; Load screen code for PI
- bne cputdirect
-L11: ora #$40
- bne cputdirect
+L10: and #$7F
+ cmp #$7E ; PI?
+ bne L11
+ lda #$5E ; Load screen code for PI
+ bne cputdirect
+L11: ora #$40
+ bne cputdirect
; Set cursor position, calculate RAM pointers
-plot: ldy CURS_X
- ldx CURS_Y
- clc
- jmp PLOT ; Set the new cursor
+plot: ldy CURS_X
+ ldx CURS_Y
+ clc
+ jmp PLOT ; Set the new cursor
; position in Y
putchar:
- ora revers ; Set revers bit
- ldy CURS_X
- sta (SCREEN_PTR),y ; Set char
- lda CHARCOLOR
- sta (CRAM_PTR),y ; Set color
- rts
+ ora RVS ; Set revers bit
+ ldy CURS_X
+ sta (SCREEN_PTR),y ; Set char
+ lda CHARCOLOR
+ sta (CRAM_PTR),y ; Set color
+ rts