162 lines
3.6 KiB
ArmAsm
162 lines
3.6 KiB
ArmAsm
;=========================================================
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; gr_copy_to_current, 40x48 version
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;=========================================================
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; copy 0xc00 to DRAW_PAGE
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;
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; 45 + 2 + 120*(8*9 + 5) -1 + 6 = 9292
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;.align $100
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gr_copy_to_current:
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lda DRAW_PAGE ; 3
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clc ; 2
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adc #$4 ; 2
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sta gr_copy_line+5 ; 4
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sta gr_copy_line+11 ; 4
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adc #$1 ; 2
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sta gr_copy_line+17 ; 4
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sta gr_copy_line+23 ; 4
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adc #$1 ; 2
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sta gr_copy_line+29 ; 4
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sta gr_copy_line+35 ; 4
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adc #$1 ; 2
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sta gr_copy_line+41 ; 4
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sta gr_copy_line+47 ; 4
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;===========
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; 45
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ldy #119 ; for early ones, copy 120 bytes ; 2
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gr_copy_line:
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lda $C00,Y ; load a byte (self modified) ; 4
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sta $400,Y ; store a byte (self modified) ; 5
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lda $C80,Y ; load a byte (self modified) ; 4
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sta $480,Y ; store a byte (self modified) ; 5
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lda $D00,Y ; load a byte (self modified) ; 4
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sta $500,Y ; store a byte (self modified) ; 5
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lda $D80,Y ; load a byte (self modified) ; 4
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sta $580,Y ; store a byte (self modified) ; 5
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lda $E00,Y ; load a byte (self modified) ; 4
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sta $600,Y ; store a byte (self modified) ; 5
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lda $E80,Y ; load a byte (self modified) ; 4
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sta $680,Y ; store a byte (self modified) ; 5
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lda $F00,Y ; load a byte (self modified) ; 4
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sta $700,Y ; store a byte (self modified) ; 5
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lda $F80,Y ; load a byte (self modified) ; 4
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sta $780,Y ; store a byte (self modified) ; 5
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dey ; decrement pointer ; 2
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bpl gr_copy_line ; ; 2nt/3
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rts ; 6
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;=========================================================
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; gr_copy_to_current, 40x48 version
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;=========================================================
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; copy 0x1000 to DRAW_PAGE
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gr_copy_to_current_1000:
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lda DRAW_PAGE ; 3
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clc ; 2
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adc #$4 ; 2
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sta gr_copy_line_40+5 ; 4
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sta gr_copy_line_40+11 ; 4
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adc #$1 ; 2
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sta gr_copy_line_40+17 ; 4
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sta gr_copy_line_40+23 ; 4
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adc #$1 ; 2
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sta gr_copy_line_40+29 ; 4
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sta gr_copy_line_40+35 ; 4
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adc #$1 ; 2
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sta gr_copy_line_40+41 ; 4
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sta gr_copy_line_40+47 ; 4
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;===========
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; 45
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ldy #119 ; for early ones, copy 120 bytes ; 2
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gr_copy_line_40:
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lda $1000,Y ; load a byte (self modified) ; 4
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sta $400,Y ; store a byte (self modified) ; 5
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lda $1080,Y ; load a byte (self modified) ; 4
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sta $480,Y ; store a byte (self modified) ; 5
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lda $1100,Y ; load a byte (self modified) ; 4
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sta $500,Y ; store a byte (self modified) ; 5
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lda $1180,Y ; load a byte (self modified) ; 4
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sta $580,Y ; store a byte (self modified) ; 5
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lda $1200,Y ; load a byte (self modified) ; 4
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sta $600,Y ; store a byte (self modified) ; 5
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lda $1280,Y ; load a byte (self modified) ; 4
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sta $680,Y ; store a byte (self modified) ; 5
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lda $1300,Y ; load a byte (self modified) ; 4
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sta $700,Y ; store a byte (self modified) ; 5
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lda $1380,Y ; load a byte (self modified) ; 4
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sta $780,Y ; store a byte (self modified) ; 5
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dey ; decrement pointer ; 2
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bpl gr_copy_line_40 ; ; 2nt/3
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rts ; 6
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;=========================================================
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; gr_copy_to_current_40x40
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;=========================================================
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; Take image in 0xc00
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; Copy to DRAW_PAGE
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; Actually copy lines 0..39
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; Don't over-write bottom 4 lines of text
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gr_copy_to_current_40x40:
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ldx #0
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gc_40x40_loop:
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lda gr_offsets,x
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sta OUTL
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sta INL
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lda gr_offsets+1,x
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clc
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adc DRAW_PAGE
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sta OUTH
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lda gr_offsets+1,x
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clc
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adc #$8
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sta INH
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ldy #39
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gc_40x40_inner:
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lda (INL),Y
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sta (OUTL),Y
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dey
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bpl gc_40x40_inner
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inx
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inx
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cpx #40
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bne gc_40x40_loop
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rts ; 6
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