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https://github.com/deater/dos33fsprogs.git
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60 lines
955 B
ArmAsm
60 lines
955 B
ArmAsm
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;================================
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; move_and_print
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;================================
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; get X,Y from OUTL/OUTH
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; then print following string to that address
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; stop at NUL
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; convert to APPLE ASCII (or with 0x80)
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; leave OUTL/OUTH pointing to next string
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move_and_print:
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ldy #0
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lda (OUTL),Y
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sta CH
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iny
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lda (OUTL),Y
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asl
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tay
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lda gr_offsets,Y ; lookup low-res memory address
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clc
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adc CH ; add in xpos
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sta BASL ; store out low byte of addy
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lda gr_offsets+1,Y ; look up high byte
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adc DRAW_PAGE ;
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sta BASH ; and store it out
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; BASH:BASL now points at right place
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clc
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lda OUTL
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adc #2
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sta OUTL
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lda OUTH
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adc #0
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sta OUTH
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;================================
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; print_string
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;================================
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print_string:
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ldy #0
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print_string_loop:
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lda (OUTL),Y
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beq done_print_string
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ora #$80
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sta (BASL),Y
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iny
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bne print_string_loop
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done_print_string:
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iny
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clc
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tya
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adc OUTL
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sta OUTL
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lda OUTH
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adc #0
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sta OUTH
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rts
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