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173 lines
2.8 KiB
ArmAsm
173 lines
2.8 KiB
ArmAsm
;
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; Mark Keates, Christian Groessler, Piotr Fusik, Karri Kaksonen
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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 _cputc
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.export _textcolor
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.import _gotoxy, _gotox, _gotoy, pusha0
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.import pushax
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.import _screen
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.import CURS_X, CURS_Y
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.include "atari7800.inc"
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.include "extzp.inc"
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.data
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;-----------------------------------------------------------------------------
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; Holder of the text colour offset
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; 0 = red, 42 = green, 84 = white
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;
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txtcolor:
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.byte 0
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.code
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;---------------------------------------------------------------------------
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; 8x16 routine
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umula0:
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ldy #8 ; Number of bits
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lda #0
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lsr ptr7800 ; Get first bit into carry
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@L0: bcc @L1
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clc
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adc ptrtmp
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tax
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lda ptrtmp+1 ; hi byte of left op
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adc ptr7800+1
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sta ptr7800+1
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txa
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@L1: ror ptr7800+1
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ror a
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ror ptr7800
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dey
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bne @L0
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tax
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lda ptr7800 ; Load the result
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rts
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;-----------------------------------------------------------------------------
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; Change the text colour
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;
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; Logical colour names are
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; 0 = red
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; 1 = green
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; 2 = white
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;
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; The routine will also return the previous textcolor
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;
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.proc _textcolor
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beq @L2
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sec
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sbc #1
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beq @L1
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lda #84
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jmp @L2
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@L1: lda #42
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@L2: ldy txtcolor
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sta txtcolor ; Store new textcolor
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tya
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bne @L3
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rts ; Old colour was 0
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@L3: sec
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sbc #42
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bne @L4
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lda #1
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rts ; Old colour was 1
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@L4: lda #2
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rts ; Old colour was 2
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.endproc
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;-----------------------------------------------------------------------------
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; Put a character on screen
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;
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; The code will handle newlines that wrap to start of screen
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;
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.proc _cputc
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cmp #$0A ; LF
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bne @L4
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@L1: lda #0 ; newline
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jsr _gotox
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lda CURS_Y
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cmp #(screenrows-1)
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bne @L2
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lda #0
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beq @L3
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@L2: clc
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adc #1
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@L3: jmp _gotoy
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@L4:
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cmp #$20 ; ' '
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bne @L5
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lda #$00
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jmp @L10
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@L5:
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cmp #$3F ; '?'
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bne @L6
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lda #$02
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jmp @L9
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@L6:
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cmp #$7C ; '|'
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bne @L7
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lda #$06
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jmp @L9
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@L7:
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cmp #$41 ; >= 'A'
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bcc @L8
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and #$5F ; make upper case
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sec
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sbc #($41 - 17)
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jmp @L9
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@L8:
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sec ; >= '*'
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sbc #($2A - 1)
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@L9:
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clc
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adc txtcolor
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@L10:
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asl
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pha
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lda #0
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sta ptr7800+1
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sta ptrtmp+1
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lda CURS_Y ; Find position on screen buffer
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sta ptr7800
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lda #charsperline
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sta ptrtmp
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jsr umula0
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clc
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adc CURS_X
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bcc @L11
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inx
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@L11: adc #<(_screen)
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sta ptr7800
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bcc @L12
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inx
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@L12: txa
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clc
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adc #>(_screen)
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sta ptr7800+1
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pla ; Print character on screen
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ldy #0
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sta (ptr7800),y
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lda CURS_X ; Increment cursor
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cmp #(charsperline-1)
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beq @L1
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clc
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adc #1
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jmp _gotox
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.endproc
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