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https://github.com/deater/dos33fsprogs.git
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63 lines
1.2 KiB
ArmAsm
63 lines
1.2 KiB
ArmAsm
PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
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SETCOL = $F864
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TEXT = $FB36 ;; Set text mode
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TABV = $FB5B
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BASCALC = $FBC1
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SETGR = $FB40
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STORADV = $FBF0
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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HLINE = $F819
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CH = $24
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CV = $25
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COLOR = $30
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TEMPY = $FF
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graphic:
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.byte $F0,$25,$1C,$F0,$26,$1C,$F0,$24,$6C,$A0,$1F,$F0,$16,$6D,$B0,$2F
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.byte $F0,$15,$69,$B0,$3F,$F0,$14,$71,$A0,$4F,$F0,$13,$72,$A0,$5F,$F0
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.byte $13,$56,$B0,$67,$F0,$20,$12,$10,$BF,$52,$F0,$12,$4D,$22,$1F,$31
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.byte $42,$3F,$62,$F0,$0F,$6D,$22,$2F,$11,$34,$12,$4F,$72,$D0,$4D,$39
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.byte $22,$BF,$82,$E0,$5D,$22,$BF,$92,$F0,$0F,$3D,$22,$A7,$BF,$F0,$11
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.byte $12,$10,$9F,$17,$CF,$00
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rle:
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jsr SETGR
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rerun:
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lda #1
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sta CH
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jsr TABV
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ldy #0
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decode_loop:
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lda graphic,Y
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pha
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jsr SETCOL ; puts (color&0xf)*17 in $30
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pla
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lsr
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lsr
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lsr
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lsr
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beq rerun ; if stride=0 then done
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cmp #$f
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bne ready
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iny
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lda graphic,Y
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ready:
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tax
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sty TEMPY
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final_loop:
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lda COLOR
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jsr STORADV ; destroys A and Y
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dex
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bne final_loop
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ldy TEMPY
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iny
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jmp decode_loop
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start:
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jmp rle ; ampersand jumps to $3f5
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; 140 is 8c in hex
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; so want to load at $3f5-$8c+3 = $36C
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