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118 lines
1.8 KiB
ArmAsm
118 lines
1.8 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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.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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.importzp tmp3,tmp4
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.include "pcengine.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 #$0d ; 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 #$0a ; LF?
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beq newline ; Recalculate pointers
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; Printable char of some sort
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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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ldy CURS_X
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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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jmp plot
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;rts
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newline:
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; lda #xsize
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; clc
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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:
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inc CURS_Y
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; jmp plot
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; rts
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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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tax
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st0 #VDC_MAWR ; Memory Adress Write
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lda SCREEN_PTR
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staio VDC_DATA_LO
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lda SCREEN_PTR+1
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staio VDC_DATA_HI
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st0 #VDC_VWR ; VWR
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txa
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staio VDC_DATA_LO ; character
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;;st2 #$32 ; attrib ?!
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lda CHARCOLOR
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;;lda #2
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asl a
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asl a
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asl a
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asl a
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and #$f0
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ora #$02
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staio VDC_DATA_HI
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rts
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