A82: Blockbuster bug

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A82: Blockbuster bug


Hi.  I wrote Blockbuster, originally for Ash, but it also worked fine 
under CrASH v1.1.  Recently, however, it has caused other games to crash 
when I use later versions of CrASH.  It always crashes ZTetris whenever 
I run Blockbuster first.  All I have to do is run the title screen of 
Blockbuster, too, I don't have to even play the game, and it crashes 
ZTetris immediately.  However, if I used the teacher key and saved a 
ZTetris game, it will run fine if I restore that game after running 
Blockbuster, and then crash when I exit.

Interestingly, when I run Columns v3.0c (even just the title screen) 
between Blockbuster and ZTetris, nothing crashes, but since there's no 
source available, I can't find out why.

Here's the source to the title screen of Blockbuster.  I can't figure 
out what it's doing wrong.  Perhaps someone more experienced can.

Beginning:
	ROM_CALL(CLEARLCD)
	set 1,(IY+05)
	set 3,(IY+05)
	ld hl,0
	ld (CURSOR_X),hl
	ld hl,Title1
	ROM_CALL(D_ZM_STR)
	ld hl,Title2
	ROM_CALL(D_ZM_STR)
	ld hl,Title1
	ROM_CALL(D_ZM_STR)
	res 3,(IY+05)
	ld hl,$0800
	ld (CURSOR_X),hl
	ld hl,Manticore
	ROM_CALL(D_ZM_STR)
	ld hl,$0f00
	ld (CURSOR_X),hl
	ld hl,Author
	ROM_CALL(D_ZM_STR)
	ld hl,$1600
	ld (CURSOR_X),hl
	ld hl,Email
	ROM_CALL(D_ZM_STR)
	ld hl,$1d00
	ld (CURSOR_X),hl
	ld hl,HighScoreText
	ROM_CALL(D_ZM_STR)
	ld hl,(HighScore)
	call DM_HL_DECI
	ld b,0
	
Menu:
	ld a,b
	cp 0
	jr z,StartIsHighlighted
	cp 1
	jr z,HelpIsHighlighted

StartIsHighlighted:
	set 3,(IY+05)
	ld hl,$2a21
	ld (CURSOR_X),hl
	ld hl,Start
	ROM_CALL(D_ZM_STR)
	res 3,(IY+05)
	ld hl,$3223
	ld (CURSOR_X),hl
	ld hl,Help
	ROM_CALL(D_ZM_STR)	
	jr Choose

HelpIsHighlighted:	
	res 3,(IY+05)
	ld hl,$2a21
	ld (CURSOR_X),hl
	ld hl,Start
	ROM_CALL(D_ZM_STR)
	set 3,(IY+05)
	ld hl,$3223
	ld (CURSOR_X),hl
	ld hl,Help
	ROM_CALL(D_ZM_STR)	

Choose:
	call GET_KEY
	cp $01
	jr z,DownOrUpKeyIsPressed
	cp $04
	jr z,DownOrUpKeyIsPressed
	cp $09
	jr z,EnterIsPressed
	cp $37
	ret z
	ld hl,(RANDSEED)
	inc hl
	ld (RANDSEED),hl
	jr Choose

Thank you for your help!

Doug Torrance

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