mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-29 00:31:52 +00:00
105 lines
1.5 KiB
ArmAsm
105 lines
1.5 KiB
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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ps_smc1:
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and #$3f ; make sure we are inverse
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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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; set normal text ($80-$ff)
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set_normal:
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lda #$80
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sta ps_smc1+1
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lda #$09 ; ora
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sta ps_smc1
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rts
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; restore inverse text ($00-$3f)
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set_inverse:
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lda #$29 ; and
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sta ps_smc1
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lda #$3f
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sta ps_smc1+1
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rts
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; set flashing text ($40-$7f)
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set_flash:
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lda #$40
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sta ps_smc1+1
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lda #$09 ; ora
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sta ps_smc1
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rts
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;================================
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; move and print a list of lines
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;================================
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; look for negative X meaning done
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move_and_print_list:
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jsr move_and_print
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ldy #0
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lda (OUTL),Y
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bpl move_and_print_list
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rts
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