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103 lines
1.5 KiB
ArmAsm
103 lines
1.5 KiB
ArmAsm
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; Ullrich von Bassewitz, 06.08.1998
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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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.constructor initconio
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.export _cputcxy, _cputc
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.export _gotoxy, cputdirect
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.export newline, putchar
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.import popa, SETWND, BASCALC
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.include "../apple2/apple2.inc"
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initconio:
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lda #$FF ; Normal character display mode
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sta INVFLG
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sta SETALTCHAR ; Switch in alternate charset
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lda #$00
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jsr SETWND ; Reset text window to full screen
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rts
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; Plot a character - also used as internal function
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_cputcxy:
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pha ; Save C
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jsr popa ; Get Y
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jsr _gotoxy
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pla ; Restore C
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_cputc:
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cmp #$0D ; Test for \r = carrage return
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bne L1
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stz CH ; Goto left edge of screen
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rts ; That's all we do
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L1:
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cmp #$0A ; Test for \n = line feed
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beq newline
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ora #$80 ; Turn on high bit
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cputdirect:
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jsr putchar
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inc CH ; Bump to next column
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lda CH
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cmp WNDWDTH
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bne return
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stz CH
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return:
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rts
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putchar:
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ldy INVFLG
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cpy #$FF ; Normal character display mode?
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beq put
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cmp #$E0 ; Lowercase?
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bmi mask
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and #$7F ; Inverse lowercase
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bra put
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mask:
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and INVFLG ; Apply normal, inverse, flash
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put:
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ldy CH
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bit RD80VID ; In 80 column mode?
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bpl col40 ; No, in 40 cols
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pha
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tya
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lsr ; Div by 2
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tay
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pla
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bcs col40 ; Odd cols go in 40 col memory
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bit HISCR
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sta (BASL),Y
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bit LOWSCR
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rts
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col40:
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sta (BASL),Y
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rts
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newline:
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lda CH
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pha
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inc CV
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lda CV
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cmp #24
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bne L2
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lda #$00
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sta CV
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L2:
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jsr BASCALC
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pla
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sta CH
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rts
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_gotoxy:
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sta CV ; Store Y
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jsr BASCALC
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jsr popa ; Get X
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sta CH ; Store X
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rts
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