144 lines
1.6 KiB
ArmAsm
144 lines
1.6 KiB
ArmAsm
; based roughly on 5 REM BY @hisham_hm Mar 7 @AppleIIBot
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; this one was an accident due to bug trying to get tunnel code working
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; very striking, but *warning flashing lights*
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H2 = $2C
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V2 = $2D
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COLOR = $30
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J = $FB
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Z = $FC
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COUNTMAX = $FD
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COUNT = $FE
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NEWCOLOR = $FF
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FULLGR = $C052
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HLINE = $F819 ;; HLINE Y,$2C at A
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VLINE = $F828 ;; VLINE A,$2D at Y
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SETCOL = $F864 ; COLOR=A
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SETGR = $FB40
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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tunnel:
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; 10 GR:N=7
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jsr SETGR
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bit FULLGR
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lda #$7
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sta NEWCOLOR
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; 20 FOR X=0 TO 4
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lda #0
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sta COUNT
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clc
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adc #16
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sta COUNTMAX
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cycle:
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; 30 FOR I=X TO 15+X STEP 5:COLOR=0
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ldx COUNT
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iloop:
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lda #0
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sta COLOR
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; 40 Z=39-I:J=I+1:W=Z-1
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txa
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eor #$ff
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sec
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adc #39
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sta Z
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sta H2
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sta V2
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dec H2
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dec V2
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txa
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clc
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adc #1
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sta J
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; HLIN J,W AT I ; HLINE Y,$2C at A
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ldy J
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txa
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jsr HLINE
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; HLIN J,W AT Z ; HLINE Y,$2C at A
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ldy J
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lda Z
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jsr HLINE
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; VLIN J,W AT I ; VLINE A,$2D at Y
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; VLIN J,W AT Z ; VLINE A,$2D at Y
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; COLOR=N
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lda NEWCOLOR
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jsr SETCOL
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; HLIN J,W AT J ; HLINE Y,$2C at A
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ldy J
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lda J
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jsr HLINE
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; HLIN J,W AT W ; HLINE Y,$2C at A
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ldy J
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lda H2
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jsr HLINE
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; VLIN J,W AT J ; VLINE A,$2D at Y
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; VLIN J,W AT W ; VLINE A,$2D at Y
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; N=N+1
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inc NEWCOLOR
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lda #75
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jsr WAIT
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; 50 NEXT:N=N-4
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txa
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clc
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adc #5
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tax
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cpx COUNTMAX
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bcc iloop
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sec
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lda NEWCOLOR
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sbc #4
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sta NEWCOLOR
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; 60 NEXT:N=N-1:IF N=0 THEN N=12
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inc COUNT
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lda COUNT
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cmp #4
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bne cycle
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dec NEWCOLOR
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bne end
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lda #12
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sta NEWCOLOR
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end:
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; 70 GOTO 20
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jmp cycle
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