;
-; Mark Keates, Christian Groessler
+; Mark Keates, Christian Groessler, Piotr Fusik
;
; void cputcxy (unsigned char x, unsigned char y, char c);
; void cputc (char c);
;
- .export _cputcxy, _cputc
- .export plot, cputdirect, putchar
- .import popa, _gotoxy
+ .export _cputcxy, _cputc
+ .export plot, cputdirect, putchar
+ .import gotoxy, __mul40
+ .importzp tmp4,ptr4
+ .import _revflag,setcursor
- .include "atari.inc"
+ .include "atari.inc"
_cputcxy:
- pha ; Save C
- jsr popa ; Get Y
- jsr _gotoxy ; Set cursor, drop x
- pla ; Restore C
-
-.ifdef DIRECT_SCREEN
-
- .importzp tmp4,ptr4
+ pha ; Save C
+ jsr gotoxy ; Set cursor, drop x and y
+ pla ; Restore C
_cputc:
- cmp #$0D ; CR
- bne L4
- lda #0
- sta COLCRS
- beq plot ; return
-
-L4: cmp #$0A ; LF
- beq newline
- cmp #ATEOL ; Atari-EOL?
- beq newline
-
- tay
- rol a
- rol a
- rol a
- rol a
- and #3
- tax
- tya
- and #$9f
- ora ataint,x
+ cmp #$0D ; CR
+ bne L4
+ lda #0
+ sta COLCRS
+ beq plot ; return
+
+L4: cmp #$0A ; LF
+ beq newline
+ cmp #ATEOL ; Atari-EOL?
+ beq newline
+
+ asl a ; shift out the inverse bit
+ adc #$c0 ; grab the inverse bit; convert ATASCII to screen code
+ bpl codeok ; screen code ok?
+ eor #$40 ; needs correction
+codeok: lsr a ; undo the shift
+ bcc cputdirect
+ eor #$80 ; restore the inverse bit
+
+cputdirect: ; accepts screen code
+ jsr putchar
-cputdirect: ; accepts screen code
- jsr putchar
-
; advance cursor
- inc COLCRS
- lda COLCRS
- cmp #40
- bcc plot
- lda #0
- sta COLCRS
-
- .export newline
+ inc COLCRS
+ lda COLCRS
+ cmp #40
+ bcc plot
+ lda #0
+ sta COLCRS
+
+ .export newline
newline:
- inc ROWCRS
- lda ROWCRS
- cmp #24
- bne plot
- lda #0
- sta ROWCRS
-plot: ldy COLCRS
- ldx ROWCRS
- rts
-
+ inc ROWCRS
+ lda ROWCRS
+ cmp #24
+ bne plot
+ lda #0
+ sta ROWCRS
+plot: jsr setcursor
+ ldy COLCRS
+ ldx ROWCRS
+ rts
+
+; turn off cursor, update screen, turn on cursor
putchar:
- pha ; save char
- lda #0
- sta tmp4
- lda ROWCRS
- asl a
- rol tmp4
- asl a
- rol tmp4 ; row * 4
- adc ROWCRS
- bcc L1
- inc tmp4 ; row * 5
-L1: asl a
- rol tmp4 ; row * 10
- asl a
- rol tmp4
- asl a
- rol tmp4 ; row * 40
-L3: clc
- adc SAVMSC ; add start of screen memory
- sta ptr4
- lda tmp4
- adc SAVMSC+1
- sta ptr4+1
- pla ; get char again
- ora INVFLG
- ldy COLCRS
- sta (ptr4),y
- rts
-
- .rodata
-ataint: .byte 64,0,32,96
-
-;****************************************************************
-.else ;***** above DIRECT_SCREEN, below thru OS ***************
-;****************************************************************
-
- .import __do_oserror,cursor,__oserror
-
-
-; Plot a character - also used as internal function
-
-_cputc: cmp #$0D ; CR?
- bne L1
- lda #0
- sta COLCRS
- beq plot ; Recalculate pointers
-
-; don't know whether this is needed. the compiler generates
-; already ATEOL chars for \n
-
-L1: cmp #$0A ; LF?
- bne L2
- lda #ATEOL
-
-; Printable char of some sort
-
-L2:
-cputdirect:
- pha
- and #$7f
- cmp #32 ; control char?
- bcs goon
- lda #$1b
- jsr putchar
-goon: pla
- jsr putchar ; Write the character to the screen
-
-plot: ldy COLCRS
- ldx ROWCRS
- rts
-
-; Write one character to the screen without doing anything else, return X
-; position in Y
-
-putchar:
-.if 0
- tax
- lda #>(retr-1)
- pha
- lda #<(retr-1)
- pha
- lda ICPTH
- pha
- lda ICPTL
- pha
- lda #0
- sta LOGCOL
- txa
- rts
-retr:
-.endif
-.if 1
- pha
- ldx #0 ; iocb #0 (screen editor)
- txa
- sta ICBLL,x
- sta ICBLH,x
- sta ICBAL,x
- sta ICBAH,x
- lda #PUTCHR
- sta ICCOM,x
- lda cursor
- beq putc7
- lda #0
- beq putc8
-putc7: lda #1
-putc8: sta CRSINH
- pla
- jsr CIOV
- bpl putc9
- jmp __do_oserror ; update system specific error code
-
-putc9: tya
- ldx #0
- stx __oserror
- ldy COLCRS
-.endif
- rts
-
-.endif ; not defined DIRECT_SCREEN
+ pha ; save char
+
+ ldy #0
+ lda OLDCHR
+ sta (OLDADR),y
+
+ lda ROWCRS
+ jsr __mul40 ; destroys tmp4, carry is cleared
+ adc SAVMSC ; add start of screen memory
+ sta ptr4
+ txa
+ adc SAVMSC+1
+ sta ptr4+1
+ pla ; get char again
+
+ ora _revflag
+ sta OLDCHR
+
+ ldy COLCRS
+ sta (ptr4),y
+ jmp setcursor
projects / cc65 / blobdiff