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5c5d01d84a
in the distribution. Added --forget-inc-paths to the command line of the assembler in the Makefiles, because the assembler does now have builtin paths and will find include files from an installation first. Hopefully fixed any problems that arose from the two changes. git-svn-id: svn://svn.cc65.org/cc65/trunk@4223 b7a2c559-68d2-44c3-8de9-860c34a00d81
106 lines
1.8 KiB
ArmAsm
106 lines
1.8 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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.import popa, _gotoxy
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.import PLOT
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.include "plus4.inc"
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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 ; Set cursor, drop x
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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 SCREEN_PTR
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sta SCREEN_PTR
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bcc L4
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inc SCREEN_PTR+1
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clc
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L4: lda #XSIZE
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adc CRAM_PTR
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sta CRAM_PTR
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bcc L5
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inc CRAM_PTR+1
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L5: 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 #$7E ; PI?
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bne L11
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lda #$5E ; Load screen code for PI
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bne cputdirect
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L11: ora #$40
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bne cputdirect
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; Set cursor position, calculate RAM pointers
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plot: 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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; 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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ora RVS ; Set revers bit
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ldy CURS_X
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sta (SCREEN_PTR),y ; Set char
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lda CHARCOLOR
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sta (CRAM_PTR),y ; Set color
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rts
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