Problems With Astroids Belt

[Appelhorne]

Hello everyone,

I am new to assembly programming. I tried to make a prime search program, which worked quite well. But now im trying to make a game (remake astroidsbelt). I already wrote code for the astroids which scroll from the top to the bottum. It works but after a few seconds everything crashes. The flash debugger says invalid z80 instruction. I am desperate i looked thru the code about hundreds times but could not find what's wrong. I even rewrote the whole thing, but still the same error!

Do you know what the problem is? Thanks in forward!

Appelhorne

PS Sorry for my bad english

My code

#include ti83plus.inc
#include mirage.inc

;Defines
bAst1X = SafeRam1
bAst1Y = SafeRam1 + 1
bAst2X = SafeRam1 + 2
bAst2Y = SafeRam1 + 3
bAst3X = SafeRam1 + 4
bAst3Y = SafeRam1 + 5
bAst4X = SafeRam1 + 6
bAst4Y = SafeRam1 + 7
bAst5X = SafeRam1 + 8
bAst5Y = SafeRam1 + 9


.org 9D93h
.db $BB, $6D ;compiled asmprgm token

ret
.db 1 ;MirageOS token

;MirageOS Icon
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000
.db %00000000, %00000000

;Discription
.db "The Asteroid Belt",0

;Program entry point
Initialize:
xor a
ld (bAst1X), a
ld (bAst1Y), a
ld a, 20
ld (bAst2X), a
ld (bAst2Y), a
ld a, 40
ld (bAst3X), a
ld (bAst3Y), a
ld a, 50
ld (bAst4X), a
ld (bAst4Y), a
ld a, 60
ld (bAst5X), a
ld (bAst5Y), a



;The main loop!
MainLoop:
;Blitting the astroids!
;Ast1
bcall(_grbufclr)

ld b, 8
ld a, (bAst1Y)
ld l, a
ld a, (bAst1X)
ld ix, sprRock
call isprite

;Ast2
ld b, 8
ld a, (bAst2Y)
ld l, a
ld a, (bAst2X)
ld ix, sprRock
call isprite

;Ast3
ld b, 8
ld a, (bAst3Y)
ld l, a
ld a, (bAst3X)
ld ix, sprRock
call isprite

;Ast4
ld b, 8
ld a, (bAst4Y)
ld l, a
ld a, (bAst4X)
ld ix, sprRock
call isprite

;Ast5
ld b, 8
ld a, (bAst5Y)
ld l, a
ld a, (bAst5X)
ld ix, sprRock
call isprite

;Flip!
call ifastcopy

;Check the astroids if they go beneath the screen
CheckAst1:
ld a, (bAst1Y)
cp 55
jp Z, ResetAstroid1
inc a
ld (bAst1Y), a

CheckAst2:
ld a, (bAst2Y)
cp 55
jp Z, ResetAstroid2
inc a
ld (bAst2Y), a

CheckAst3:
ld a, (bAst3Y)
cp 55
jp Z, ResetAstroid3
inc a
ld (bAst3Y), a

CheckAst4:
ld a, (bAst4Y)
cp 55
jp Z, ResetAstroid4
inc a
ld (bAst4Y), a

CheckAst5:
ld a, (bAst5Y)
cp 55
jp Z, ResetAstroid5
inc a
ld (bAst5Y), a

;Loop
jp MainLoop

;Routines for resetting the astroid
ResetAstroid1:
xor a
ld (bAst1Y), a
ld b, 87
call irandom
ld (bAst1X), a
jp CheckAst2

ResetAstroid2:
xor a
ld (bAst2Y), a
ld b, 87
call irandom
ld (bAst2X), a
jp CheckAst3

ResetAstroid3:
xor a
ld (bAst3Y), a
ld b, 87
call irandom
ld (bAst3X), a
jp CheckAst4

ResetAstroid4:
xor a
ld (bAst4Y), a
ld b, 87
call irandom
ld (bAst4X), a
jp CheckAst5

ResetAstroid5:
xor a
ld (bAst5Y), a
ld b, 87
call irandom
ld (bAst5X), a
jp MainLoop

sprRock:
.db %00011000
.db %00111100
.db %01111110
.db %11111111
.db %11111111
.db %01111110
.db %00111100
.db %00011000

[JacobdeHaan]

Well, I compiled and ran it.
I experienced the exact same problem. I don't want this group to make a bad impression on you, so I will keep working on it.
BTW, what instruction did the debugger say was invalid?

[Appelhorne]

Thanks Jacob

The invalid instruction was on 9E1A.

The compiled thing looks like this:

[JacobdeHaan]

That is so wierd. I haven't got clue as to your problem. But if one of the smart guys would get in here, they'd be able to fix it without a problem. Just sorry you have to wait so long to get started on your program.

[sgm]

Have you tried the VTI debugger (needs base code 1.12 or lower)? The flash debugger is supposed to be for Flash Apps and can be buggy with ASAPs.


Have you tried on an actual calculator? It's not like you could lose anything.

[Appelhorne]

I get the same problem on real calulators. VTI doesn't work here for some reason

[Darth Android]

nope. vti doesnt yet support apps, so you wouldnt be able to load Mirage :(

//whats with this???

[Justin W.]

[Justin W.]

Another thing I'd like to make mention of is that the 8*8 asteroids can be written up to the 56th Y-Coordinate. So you have one more row before you have to reset your asteroids. Just another tidbit of information.

[Appelhorne]

Thanks for your reply Justin!! I just finished Astroidsbelt!

[Justin W.]

You're most welcome . It is also good to hear that you completed your game. Congratulations!

[JacobdeHaan]

So, where can we download it?

[Appelhorne]

I wanted to add some features to my astroidsbelt, but i ran into a new problem . My idea was to have randomly small and large astroids. In the beginning of the game the most astroids have to be small, but when you come further in the level it will get harder and more larger astroids. I wrote a routine what determines on the score have how far you are in the level. But it does not seems to work. When I play the game 50 % of the astroids are large and the rest small.

Here is my routine:

[sgm]

Yes, IonRandom returns a random number in A (probably), and the high byte of the player's score at any point will be small and relatively constant, so the decision to make an asteroid large or small is based entirely on the result of a random number minus a constant.

Actually, I see now that you are actually subtracting the high byte of the address of the player's score, which will be some number around $90. Since the this is roughly the average of the results of IonRandom(255), you'll get a 50-50 mix of small and large asteroids every time.

[Adm.Wiggin]

[Appelhorne]

Thanks for the help!

I haven't tried your second advice yet, but i think it should be

ld h, (wScore + 1)