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<blockquote data-quote="Zaphod77" data-source="post: 298210" data-attributes="member: 2101"><p>There are three major rom bugs in the game.</p><p></p><p>1) ball saver stacking bug. If you get a second ball saver while one is already running, they stack (the ball saver active flag is incremented to 2 instead of set to 1), and then when the ball saver timer expires, the ball saver on flag is decremented instead of directly set to zero. Saving a ball only turns off the ballsaver because it zeroes the timer. Then, because the ballsaver enabled flag is still positive, the timer then wraps around to 255 seconds, which is almost 5 minutes. high speed 2 used to have this EXACT same bug.</p><p></p><p>2) mode+multiball bug. what's supposed to happen is that the mode stops, and then when multiball ends, the mode starts over but you keep your points. but if the mode has multiple stages, like sniper tower (first stage the hurryup counts down, and in the second stage the sniper is falling and the value is fixed) or safe cracker (same rule, second stage freezes the hurryup), if you start multiball during the second stage, the mode instead continues, and then you can stack other modes with that multiball, which is highly buggy.</p><p></p><p>3)double ultimate challenge bug. if you get it from mutliball, it turns on the flag telling the game to not reset the mode lights after ultimate challenge. This is of course correct. BUT... this flag is only turned off by a drain, when it should be turned off by shooting start chain link. This means that until you drain after the mutiball ultimate challenge, you can restart chain link ultimate challenge infinitely by shooting chain link start. once you drain, then the flag gets cleared and your next chain link ultimate challenge will reset the lights.</p><p></p><p>The fixes are as follows.</p><p></p><p>1) when the ballsaver timer hits zero, set the ballsaver active flag directly to zero. (uses a little more space, probably, which is probably why they used the silly increment/decrement system in the first place)</p><p></p><p>2) disable multiball start while in the second stage of a 2 stage mode. Again, requires a little bit of code space, if you want to keep the restart logic.</p><p></p><p>3) instead of turning off the "don't reset the mode lights" flag during a drain, turn it off when a lit "BUILD UP CHAIN FEATURE" shot is hit. This ensures that it will never be set if ultimate challenge is started outside of multiball, since bug 2 is also fixed.</p></blockquote><p></p>
[QUOTE="Zaphod77, post: 298210, member: 2101"] There are three major rom bugs in the game. 1) ball saver stacking bug. If you get a second ball saver while one is already running, they stack (the ball saver active flag is incremented to 2 instead of set to 1), and then when the ball saver timer expires, the ball saver on flag is decremented instead of directly set to zero. Saving a ball only turns off the ballsaver because it zeroes the timer. Then, because the ballsaver enabled flag is still positive, the timer then wraps around to 255 seconds, which is almost 5 minutes. high speed 2 used to have this EXACT same bug. 2) mode+multiball bug. what's supposed to happen is that the mode stops, and then when multiball ends, the mode starts over but you keep your points. but if the mode has multiple stages, like sniper tower (first stage the hurryup counts down, and in the second stage the sniper is falling and the value is fixed) or safe cracker (same rule, second stage freezes the hurryup), if you start multiball during the second stage, the mode instead continues, and then you can stack other modes with that multiball, which is highly buggy. 3)double ultimate challenge bug. if you get it from mutliball, it turns on the flag telling the game to not reset the mode lights after ultimate challenge. This is of course correct. BUT... this flag is only turned off by a drain, when it should be turned off by shooting start chain link. This means that until you drain after the mutiball ultimate challenge, you can restart chain link ultimate challenge infinitely by shooting chain link start. once you drain, then the flag gets cleared and your next chain link ultimate challenge will reset the lights. The fixes are as follows. 1) when the ballsaver timer hits zero, set the ballsaver active flag directly to zero. (uses a little more space, probably, which is probably why they used the silly increment/decrement system in the first place) 2) disable multiball start while in the second stage of a 2 stage mode. Again, requires a little bit of code space, if you want to keep the restart logic. 3) instead of turning off the "don't reset the mode lights" flag during a drain, turn it off when a lit "BUILD UP CHAIN FEATURE" shot is hit. This ensures that it will never be set if ultimate challenge is started outside of multiball, since bug 2 is also fixed. [/QUOTE]
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