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Bounty Bob Glitch


koolmoecraig

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I have some weird issues with my Bount Bob cartridge.

 

On the 2nd screen, the elevator is invisible. I can still play it and work the elevator but it's not there on the screen. I have to guess where it is and where I left it which obviously makes it much more difficult. :)

 

Also, on the level with the acid rain, the acid rain isnt there. Makes that level much easier.

 

Anyone know what could cause this? Game plays correctly otherwise.

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I have some weird issues with my Bount Bob cartridge.

 

On the 2nd screen, the elevator is invisible. I can still play it and work the elevator but it's not there on the screen. I have to guess where it is and where I left it which obviously makes it much more difficult. :)

 

Also, on the level with the acid rain, the acid rain isnt there. Makes that level much easier.

 

Anyone know what could cause this? Game plays correctly otherwise.

GTIA maybe?

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First things I'd try - clean the cart contacts, if no difference try in another machine.

 

A very rudimentary test for the GTIA hardware, try running this program from Basic:

10 GRAPHICS 0:POKE 710,0:POKE 712,2:POKE 704,52:POKE 705,182:POKE 706,136:POKE 707,250:POKE 53277,0
20 POKE 709,84:POKE 623,17
30 FOR A=53248 TO 53265:READ D:POKE A,D:NEXT A
40 DATA 48,80,112,144,200,192,184,176
50 DATA 3,3,3,3,255
60 DATA 85,85,85,85,85

Should produce a screen like this.

 

post-7804-0-07594800-1492515845_thumb.png

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Rybags, a small thread sway if you don't mind, I've never been in to BASIC on any machine, I side stepped it and went into machine code. Now I understand 99.9% of the little GTIA display program but the READ and the use of D: I have never seen. I've seen the usual outputs like S: P: and the normal D:

 

I know its reading the data into that address and incrementing to the next data bit to be read, I just don't know how the READ D:Poke blah blah works..

 

I know, silly but its going to niggle me if I don't ask, had a quick look at the BASIC ref manual but that just confused the issue.

 

Paul.

 

D: isn't also a shortcut for the DATA command is it when used with READ?

Edited by Mclaneinc
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Rybags, a small thread sway if you don't mind, I've never been in to BASIC on any machine, I side stepped it and went into machine code. Now I understand 99.9% of the little GTIA display program but the READ and the use of D: I have never seen. I've seen the usual outputs like S: P: and the normal D:

 

I know its reading the data into that address and incrementing to the next data bit to be read, I just don't know how the READ D:Poke blah blah works..

 

I know, silly but its going to niggle me if I don't ask, had a quick look at the BASIC ref manual but that just confused the issue.

 

Paul.

 

D: isn't also a shortcut for the DATA command is it when used with READ?

"D" is a variable

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The colon after the "D" is just a separator that allows more than one command to be put on a single line entry.

 

If the commands that are chained in line #30 had been written each on their own lines, it would have looked like this, and accomplishes the same as above.

[spacer]

30 FOR A=53248 TO 53265
32 READ D
34 POKE A,D
36 NEXT A
Edited by MrFish
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I did it as a block of data since each register in turn needed to be changed - the PM positioning could be done by a loop but to do just 4 stores not worth the effort, and the missiles have lesser spacing and you want them in reverse order due to how the data maps to them.

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Wow! Thanks for the responses.

 

It was a NIB 800XL that I opened up about 2 years ago.

 

No other hardware is attached. I have it hooked it an Toshiba TV from the late 90's through one of those monitor port to composite cables that's sold on eBay.

 

Every other game works perfectly.

 

I'm going to run that GTIA test that Rybags suggested. I'll report back shortly.

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clean both card edge and cartridge port, make sure that silicon hasn't worked into the contact split or weakened the contacts pressure.. I had an XE that the connector was weakened and I tried very hard to work a way to restore it.. tedious... the next time I ran into the problem I just replaced the darn connector, clean connections solve so many difficulties..

Edited by _The Doctor__
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