diff --git a/demos/second/interrupt_handler.s b/demos/second/interrupt_handler.s
index 85da4909..f2d73df3 100644
--- a/demos/second/interrupt_handler.s
+++ b/demos/second/interrupt_handler.s
@@ -29,6 +29,11 @@ interrupt_handler:
 
 ;	inc	$0404		; debug (flashes char onscreen)
 
+	lda	IRQ_COUNTDOWN
+	beq	skip_irq_dec
+	dec	IRQ_COUNTDOWN
+skip_irq_dec:
+
 
 .include "pt3_lib_irq_handler.s"
 
diff --git a/demos/second/music.s b/demos/second/music.s
index 86d60bc1..d018540b 100644
--- a/demos/second/music.s
+++ b/demos/second/music.s
@@ -28,5 +28,6 @@ PT3_ENABLE_APPLE_IIC = 1
 .align $100
 PT3_LOC:
 ;.incbin "music/z00m_unreal2_part1.pt3"
-.incbin "music/z00m_unreal2_part2.pt3"
+;.incbin "music/z00m_unreal2_part2.pt3"
+.incbin "music/second_3d.pt3"
 
diff --git a/demos/second/music/second_3d.pt3 b/demos/second/music/second_3d.pt3
new file mode 100644
index 00000000..3d6f06d6
Binary files /dev/null and b/demos/second/music/second_3d.pt3 differ
diff --git a/demos/second/part18_3d/3d.inc b/demos/second/part18_3d/3d.inc
index cd1838f5..b2b24197 100644
--- a/demos/second/part18_3d/3d.inc
+++ b/demos/second/part18_3d/3d.inc
@@ -85,6 +85,11 @@ frame15:
 	.include "auto/frame098.inc"	;
 	.include "auto/frame099.inc"	;
 	.include "auto/frame100.inc"	;
+	.include "auto/frame101.inc"	;
+	.include "auto/frame102.inc"	;
+	.include "auto/frame103.inc"	;
+	.include "auto/frame104.inc"	;
+	.include "auto/frame105.inc"	;
 
-num_scenes=(100-15)+1
+num_scenes=(105-15)+1
 
diff --git a/demos/second/part18_3d/auto/frame101.inc b/demos/second/part18_3d/auto/frame101.inc
new file mode 100644
index 00000000..d301bea6
--- /dev/null
+++ b/demos/second/part18_3d/auto/frame101.inc
@@ -0,0 +1,48 @@
+	.byte SET_COLOR | GREEN
+	.byte BOX,4,6,35,41
+	.byte SET_COLOR | PINK
+	.byte 4,13,7,23
+	.byte 9,25,15,28
+	.byte 8,32,15,41
+	.byte 5,8,8,9
+	.byte HLIN,6,8,10
+	.byte SET_COLOR | BROWN
+	.byte BOX,5,6,8,7
+	.byte 19,11,32,12
+	.byte BOX_ADD,18,33,16	; 13
+	.byte BOX_ADD_LSAME,34,21 ; 18, 17
+	.byte 35,25
+	.byte BOX,9,23,14,28
+	.byte 18,26,34,27
+	.byte BOX_ADD,19,33,29	; 28
+	.byte BOX,9,29,15,31
+	.byte BOX_ADD,22,32,33	; 32
+	.byte BOX,8,32,15,38
+	.byte 4,13,6,20
+	.byte HLIN,23,28,7
+	.byte HLIN_ADD,21,29	; 8
+	.byte 20,30	; 9
+	.byte HLIN_ADD_LSAME,31 ; 20, 31, 10
+	.byte HLIN,11,14,22
+	.byte 20,33,30
+	.byte HLIN_ADD,21,32	; 31
+	.byte HLIN,23,28,34
+	.byte 8,13,39
+	.byte 4,5,21
+	.byte PLOT,8,40
+	.byte SET_COLOR | DARK_BLUE
+	.byte BOX,20,14,31,16
+	.byte BOX_ADD_LSAME,32,21 ; 20, 17
+	.byte 33,23
+	.byte 32,25
+	.byte BOX,22,27,31,28
+	.byte HLIN,22,28,10
+	.byte HLIN_ADD_LSAME,29 ; 22, 29, 11
+	.byte HLIN,21,30,12
+	.byte HLIN_ADD_LSAME,31 ; 21, 31, 13
+	.byte HLIN,21,31,26
+	.byte 23,30,29
+	.byte 25,27,9
+	.byte 24,26,30
+	.byte END
+; total size = 155
diff --git a/demos/second/part18_3d/auto/frame102.inc b/demos/second/part18_3d/auto/frame102.inc
new file mode 100644
index 00000000..2bece56c
--- /dev/null
+++ b/demos/second/part18_3d/auto/frame102.inc
@@ -0,0 +1,65 @@
+	.byte SET_COLOR | GREEN
+	.byte BOX,4,28,35,41
+	.byte 10,22,35,27
+	.byte SET_COLOR | MEDIUM_BLUE
+	.byte 5,6,35,15
+	.byte BOX_ADD_RSAME,6,17
+	.byte 7,21	; 35 18
+	.byte HLIN,7,32,22
+	.byte HLIN_ADD,8,27	; 23
+	.byte HLIN_ADD_LSAME,22 ; 8, 22, 24
+	.byte 18
+	.byte 14
+	.byte 9
+	.byte SET_COLOR | BROWN
+	.byte BOX,28,25,32,28
+	.byte 22,26,26,31
+	.byte 28,29,35,31
+	.byte 22,33,27,34
+	.byte 16,33,20,36
+	.byte BOX_ADD,9,11,41	; 37
+	.byte HLIN,31,32,24
+	.byte 22,33,32
+	.byte 18,20,32
+	.byte 28,31,41
+	.byte 34,35,28
+	.byte PLOT,26,25
+	.byte SET_COLOR | LIGHT_BLUE
+	.byte BOX,19,6,22,9
+	.byte 13,7,15,11
+	.byte 26,13,28,17
+	.byte 31,13,33,16
+	.byte 19,15,22,18
+	.byte 14,16,16,19
+	.byte 26,6,28,8
+	.byte HLIN,32,34,6
+	.byte 14,15,6
+	.byte HLIN_ADD,32,33	; 7
+	.byte HLIN,19,21,10
+	.byte 32,33,12
+	.byte 14,15,20
+	.byte SET_COLOR | PINK
+	.byte 30,32,27
+	.byte HLIN_ADD_RSAME,28	; 28 32 28
+	.byte HLIN,23,26,29
+	.byte HLIN_ADD,22,24	; 30
+	.byte HLIN,31,33,32
+	.byte HLIN_ADD_RSAME,29	; 29 33 33
+	.byte HLIN,23,27,34
+	.byte HLIN_ADD,22,25	; 35
+	.byte HLIN,19,20,35
+	.byte HLIN_ADD_RSAME,16	; 16 20 36
+	.byte HLIN,16,17,37
+	.byte VLIN,31,32,35
+	.byte PLOT,26,28
+	.byte 28,29
+	.byte 27,33
+	.byte 29,34
+	.byte SET_COLOR | GREY1
+	.byte BOX,4,21,5,28
+	.byte 4,11,5,15
+	.byte VLIN,6,10,4
+	.byte SET_COLOR | GREY2
+	.byte PLOT,5,28
+	.byte END
+; total size = 195
diff --git a/demos/second/part18_3d/auto/frame103.inc b/demos/second/part18_3d/auto/frame103.inc
new file mode 100644
index 00000000..828839e1
--- /dev/null
+++ b/demos/second/part18_3d/auto/frame103.inc
@@ -0,0 +1,53 @@
+	.byte SET_COLOR | DARK_BLUE
+	.byte BOX,5,6,35,21
+	.byte SET_COLOR | MEDIUM_BLUE
+	.byte BOX_ADD_RSAME,4,32
+	.byte 7,37	; 35 33
+	.byte 8,41	; 35 38
+	.byte BOX,4,6,5,9
+	.byte HLIN,27,35,17
+	.byte HLIN_ADD_RSAME,22	; 22 35 18
+	.byte 17	; 17 35 19
+	.byte 13	; 13 35 20
+	.byte 8	; 8 35 21
+	.byte HLIN,32,35,16
+	.byte VLIN,38,41,4
+	.byte SET_COLOR | LIGHT_BLUE
+	.byte BOX,30,21,32,25
+	.byte 22,23,25,27
+	.byte 14,24,17,28
+	.byte 29,30,31,34
+	.byte 22,32,24,35
+	.byte 15,33,18,37
+	.byte BOX_ADD,28,30,41	; 38
+	.byte BOX,33,38,35,40
+	.byte 22,40,24,41
+	.byte HLIN,23,25,22
+	.byte 34,35,37
+	.byte HLIN_ADD,15,16	; 38
+	.byte HLIN,17,19,41
+	.byte 23,24,39
+	.byte VLIN,29,32,35
+	.byte SET_COLOR | BROWN
+	.byte BOX,20,6,21,15
+	.byte 7,6,8,12
+	.byte 23,12,32,13
+	.byte 6,13,7,17
+	.byte HLIN,25,32,11
+	.byte 30,31,10
+	.byte SET_COLOR | GREY1
+	.byte BOX,4,25,5,30
+	.byte BOX_ADD_LSAME,6,32 ; 4, 31
+	.byte BOX,5,38,6,41
+	.byte VLIN,14,24,4
+	.byte SET_COLOR | PINK
+	.byte HLIN,30,32,12
+	.byte HLIN_ADD_RSAME,26	; 26 32 13
+	.byte HLIN,23,30,14
+	.byte HLIN_ADD_LSAME,26 ; 23, 26, 15
+	.byte HLIN,20,21,15
+	.byte 6,7,18
+	.byte SET_COLOR | GREY2
+	.byte PLOT,4,10
+	.byte END
+; total size = 164
diff --git a/demos/second/part18_3d/auto/frame104.inc b/demos/second/part18_3d/auto/frame104.inc
new file mode 100644
index 00000000..887725cd
--- /dev/null
+++ b/demos/second/part18_3d/auto/frame104.inc
@@ -0,0 +1,71 @@
+	.byte SET_COLOR | MEDIUM_BLUE
+	.byte BOX,4,6,27,27
+	.byte BOX_ADD,6,8,38	; 28
+	.byte SET_COLOR | DARK_BLUE
+	.byte BOX,8,29,35,38
+	.byte BOX_ADD_RSAME,5,41
+	.byte BOX,9,19,35,28
+	.byte HLIN,4,14,6
+	.byte 28,35,14
+	.byte HLIN_ADD_RSAME,27	; 27 35 15
+	.byte 22	; 22 35 16
+	.byte 17	; 17 35 17
+	.byte 12	; 12 35 18
+	.byte HLIN,4,10,7
+	.byte SET_COLOR | PINK
+	.byte BOX,23,18,29,19
+	.byte BOX_ADD,12,18,21	; 20
+	.byte BOX,12,28,18,29
+	.byte 27,26,32,33
+	.byte HLIN,21,23,20
+	.byte 12,14,22
+	.byte 12,14,30
+	.byte VLIN,6,13,28
+	.byte SET_COLOR | BROWN
+	.byte BOX,30,6,35,8
+	.byte BOX_ADD_RSAME,31,11
+	.byte 30,13	; 35 12
+	.byte BOX,26,24,31,25
+	.byte BOX_ADD_LSAME,32,28 ; 26, 26
+	.byte BOX,23,35,24,38
+	.byte 9,37,10,41
+	.byte 22,27,23,29
+	.byte HLIN,28,30,14
+	.byte 24,29,17
+	.byte 13,18,19
+	.byte HLIN_ADD,12,15	; 20
+	.byte HLIN,21,22,20
+	.byte 27,31,23
+	.byte 16,18,27
+	.byte HLIN_ADD,12,17	; 28
+	.byte 27,28	; 29
+	.byte VLIN,20,36,10
+	.byte 21,26,22
+	.byte 30,34,23
+	.byte 39,41,24
+	.byte 18,19,21
+	.byte 30,31,27
+	.byte PLOT,23,18
+	.byte 12,29
+	.byte SET_COLOR | LIGHT_BLUE
+	.byte BOX,17,8,19,11
+	.byte 12,9,14,12
+	.byte 7,10,9,13
+	.byte 22,7,23,10
+	.byte HLIN,22,23,15
+	.byte HLIN_ADD,18,19	; 16
+	.byte 13,14	; 17
+	.byte 9,10	; 18
+	.byte SET_COLOR | GREY1
+	.byte BOX,5,39,7,41
+	.byte 5,33,6,38
+	.byte HLIN,6,7,6
+	.byte 4,5,27
+	.byte VLIN,21,26,4
+	.byte 31,32,5
+	.byte SET_COLOR | GREY2
+	.byte HLIN,28,29,14
+	.byte VLIN,6,8,30
+	.byte PLOT,4,20
+	.byte END
+; total size = 223
diff --git a/demos/second/part18_3d/auto/frame105.inc b/demos/second/part18_3d/auto/frame105.inc
new file mode 100644
index 00000000..a3588309
--- /dev/null
+++ b/demos/second/part18_3d/auto/frame105.inc
@@ -0,0 +1,104 @@
+	.byte SET_COLOR | MEDIUM_BLUE
+	.byte BOX,4,6,29,39
+	.byte BOX_ADD,6,9,41	; 40
+	.byte SET_COLOR | DARK_BLUE
+	.byte BOX,6,7,35,9
+	.byte 5,12,35,14
+	.byte BOX_ADD_LSAME,29,18 ; 5, 15
+	.byte BOX,4,19,29,20
+	.byte 31,28,35,33
+	.byte 10,40,35,41
+	.byte 31,10,32,11
+	.byte HLIN,10,35,6
+	.byte 6,29,10
+	.byte HLIN_ADD_RSAME,5	; 5 29 11
+	.byte HLIN,4,27,21
+	.byte HLIN_ADD_LSAME,22 ; 4, 22, 22
+	.byte 17
+	.byte HLIN,19,35,35
+	.byte HLIN_ADD_RSAME,18	; 18 35 36
+	.byte 14	; 14 35 37
+	.byte 10	; 10 35 38
+	.byte 11	; 11 35 39
+	.byte HLIN,27,35,34
+	.byte VLIN,15,16,32
+	.byte SET_COLOR | LIGHT_BLUE
+	.byte BOX,8,8,9,12
+	.byte BOX_ADD_LSAME,14,15 ; 8, 13
+	.byte BOX,10,13,12,16
+	.byte 24,23,25,27
+	.byte 19,24,20,28
+	.byte 14,25,16,29
+	.byte 9,27,11,30
+	.byte 24,30,25,34
+	.byte 19,31,21,35
+	.byte 14,32,16,36
+	.byte 10,33,11,37
+	.byte 13,10,14,11
+	.byte HLIN,7,8,6
+	.byte 8,13,9
+	.byte 9,10,26
+	.byte VLIN,16,21,14
+	.byte 17,18,10
+	.byte PLOT,14,12
+	.byte 10,38
+	.byte SET_COLOR | BROWN
+	.byte BOX,16,6,21,7
+	.byte 33,6,35,16
+	.byte 8,8,12,9
+	.byte 18,11,22,13
+	.byte 11,12,12,16
+	.byte BOX_ADD,31,35,18	; 17
+	.byte BOX,16,18,21,20
+	.byte 32,19,35,27
+	.byte 7,20,12,22
+	.byte 30,28,35,32
+	.byte 24,37,32,38
+	.byte 12,40,20,41
+	.byte 24,40,25,41
+	.byte HLIN,22,23,16
+	.byte 30,33,33
+	.byte 30,32,35
+	.byte HLIN_ADD_RSAME,28	; 28 32 36
+	.byte HLIN,15,20,39
+	.byte 24,29,39
+	.byte 19,20,38
+	.byte VLIN,9,15,8
+	.byte 8,10,21
+	.byte 17,19,14
+	.byte 10,11,14
+	.byte 14,15,22
+	.byte PLOT,23,17
+	.byte SET_COLOR | PINK
+	.byte BOX,16,6,20,7
+	.byte 27,6,30,7
+	.byte BOX_ADD_RSAME,28,9
+	.byte BOX,18,12,21,13
+	.byte 29,12,30,14
+	.byte 16,19,21,20
+	.byte BOX_ADD,7,12,22	; 21
+	.byte BOX,28,10,29,11
+	.byte HLIN,8,12,9
+	.byte 28,32,38
+	.byte HLIN_ADD,25,29	; 39
+	.byte HLIN,14,20,41
+	.byte 19,20,40
+	.byte VLIN,14,15,8
+	.byte 18,19,23
+	.byte 20,21,14
+	.byte PLOT,32,37
+	.byte SET_COLOR | GREY1
+	.byte BOX,10,13,13,15
+	.byte 30,28,31,33
+	.byte HLIN,11,12,12
+	.byte VLIN,24,27,30
+	.byte PLOT,11,11
+	.byte 11,16
+	.byte SET_COLOR | GREY2
+	.byte BOX,4,38,5,39
+	.byte VLIN,31,37,4
+	.byte 15,18,31
+	.byte SET_COLOR | YELLOW
+	.byte PLOT,12,15
+	.byte END
+; total size = 347
diff --git a/demos/second/part18_3d/threed.s b/demos/second/part18_3d/threed.s
index 5adacc38..142b71d0 100644
--- a/demos/second/part18_3d/threed.s
+++ b/demos/second/part18_3d/threed.s
@@ -65,8 +65,14 @@ was_page1:
 done_pageflip:
 	sta	DRAW_PAGE						; 3
 
+	lda	#12
+	sta	IRQ_COUNTDOWN
 
-	jsr	wait_until_keypress
+wait_for_irq:
+	lda	IRQ_COUNTDOWN
+	bne	wait_for_irq
+
+;	jsr	wait_until_keypress
 
 
 
diff --git a/demos/second/zp.inc b/demos/second/zp.inc
index b74b05e1..2e1f3cc4 100644
--- a/demos/second/zp.inc
+++ b/demos/second/zp.inc
@@ -160,7 +160,7 @@ SCENE_COUNT = $EC
 STATE           = $ED
 OFFSET         = $EF
 
-				;FIRST		=	$F0
+IRQ_COUNTDOWN	= $F0
 
 LASTKEY         = $F1
 PADDLE_STATUS   = $F2