mirror of https://github.com/GnoConsortium/gno.git
124 lines
1.3 KiB
NASM
124 lines
1.3 KiB
NASM
case on
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keep bprasm
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doline start
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pha
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tsc
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phd
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tcd
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phb
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phk
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plb
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counter equ 1
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RTLs equ 3
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dest equ 6
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source equ 10
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cols equ 14
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actual equ 16
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PREVIOUS equ 18
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pei actual
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stz counter
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ldy #0
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loop anop
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lda [source],y
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jsr puthex
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iny
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dec cols
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dec actual
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bne loop
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ldy counter
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loop2 lda cols
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beq done
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lda #$2020
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sta [dest],y
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iny
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sta [dest],y
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iny
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iny
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dec cols
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bra loop2
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done anop
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pla
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sta actual
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tya
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clc
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inc a
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adc actual
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sta counter
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ldy actual
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chrloop dey
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cpy #$ffff
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beq endloop
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lda [source],y
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and #$ff
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cmp #$7f
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bcs noprint
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cmp #$20
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bcs printable
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noprint lda #'.'
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printable sep #$20
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sta [source],y
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rep #$20
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bra chrloop
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endloop ldy actual
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dey
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lda [source],y
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and #$00ff
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ora #$0d00
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sta [source],y
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ldy counter
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plb
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lda 4
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sta PREVIOUS-2
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lda 3
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sta PREVIOUS-3
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pld
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tsc
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clc
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adc #PREVIOUS-4
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tcs
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tya
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rtl
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end
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puthex private
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counter equ 1
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RTLs equ 3
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dest equ 6
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source equ 10
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cols equ 14
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phy
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ldy counter
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pha
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lsr a
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lsr a
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lsr a
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lsr a
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and #$f
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tax
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lda hexdigits,x
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sta [<dest],y
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iny
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pla
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and #$f
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tax
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lda hexdigits,x
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and #$00ff
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ora #$2000
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sta [<dest],y
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iny
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iny
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sty counter
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ply
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rts
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end
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hexdigits privdata
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dc c'0123456789ABCDEF'
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end
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