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https://github.com/deater/dos33fsprogs.git
synced 2024-05-29 08:41:36 +00:00
81 lines
1.1 KiB
ArmAsm
81 lines
1.1 KiB
ArmAsm
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; 11+48 = 59 bytes
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gr_setup_line:
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lda gr_lookup_low,X ; 4
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sta GBASL ; 3
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lda gr_lookup_high,X ; 4
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sta GBASH ; 3
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rts
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gr_lookup_low:
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.byte $00,$80,$00,$80,$00,$80,$00,$80
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.byte $28,$A8,$28,$A8,$28,$A8,$28,$A8
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.byte $50,$D0,$50,$D0,$50,$D0,$50,$D0
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gr_lookup_high:
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.byte $08,$08,$09,$09,$0A,$0A,$0B,$0B
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.byte $08,$08,$09,$09,$0A,$0A,$0B,$0B
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.byte $08,$08,$09,$09,$0A,$0A,$0B,$0B
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; 28+10 = 38
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gr_setup_line2:
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txa
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pha
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and #7
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lsr
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tax
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lda gr_lookup_high2,X
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sta GBASH
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pla
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pha
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lsr
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php
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lsr
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lsr
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plp
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rol
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tax
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lda gr_lookup_low2,X
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sta GBASL
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pla
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tax
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rts
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; high= gr_lookup_high[(line&3)>>1]
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; low = gr_lookup_low[abc defgh -> 0 1 0 1 0 1 2 3 2 3 2 3 2 3 4 5 4 5 4 5 4 5
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; deh
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gr_lookup_low2:
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.byte $00,$80,$28,$A8,$50,$D0
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gr_lookup_high2:
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.byte $08,$09,$0A,$0B
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; 24 bytes
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; based on GBASCALC from monitor firmware
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gr_setup_line3:
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txa ; 2
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lsr ; 2
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and #$03 ; 2
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ora #$08 ; 2
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sta GBASH ; 3
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txa
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and #$18
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bcc gbcalc
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adc #$7f
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gbcalc:
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sta GBASL
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asl
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asl
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ora GBASL
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sta GBASL
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rts
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gr_setup_line4:
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txa
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jmp GBASCALC
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