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