Re: Armor Attack sounds and rom versions

Bill, not sure if you have a different schematic but I don't have an ic28. Reguardless, I replaced all tl081'swith no change.. swapped out a couple other logic ic's and no change..
I did try the other sound board in the game and it seems to work fine. The engine noise on that one is very faint compared to everything else. I guess on the bad sound board, I could say the engine noise is overwhelming compared to all other sounds...its really loud.. The morse does have a 'slight' distortion to it as well and when turning on the machine, the explosion sound almost seems to have a slight reverb to it as it fades..

--- On Tue, 6/2/09, William Boucher <boucher@mnsi.net> wrote:

> From: William Boucher <boucher@mnsi.net>
> Subject: Re: VECTOR: Armor Attack sounds and rom versions
> To: vectorlist@vectorlist.org
> Received: Tuesday, June 2, 2009, 8:57 PM
> Swap the audio boards and see if the
> tank sound problem follows the audio board or stays with the
> CCPU.  The shift register 74LS259 at F2 on the CCPU
> might be bad and causing inappropriate sound behavior.
>
> The tanks have two speed related sounds, the engine and the
> tread squeak. The squeaks stay the same but just repeat
> faster as the tank speeds up.  The engine rumble
> frequency has 15 levels.  The sound should not get
> louder and it should not get distorted.  The tank
> engine sound is the single most complex sound circuit and it
> consists of several chips and about 50 discrete passive
> components.  It's too complicated to go into it here
> but if the engine sound is okay at the lowest level and if
> the squeaks are okay too, then the logic is probably working
> okay.  It may be then that the opamp (8-pin DIP TL081)
> at location IC28 is bad.  This is especially suspect if
> the explosions and the morse code beep are also
> significantly noisy or distorted.  It is possible that
> the problem is in the final power stage of the amplifier
> (i.e. bad transistor Q12 or Q13 or bad TL081 at IC24.
>
> It's really hard to guess since I haven't actually heard it
> but maybe that'll get you started.
>
> If you get the Armor Attack manual pdf, there's a really
> good description in there of how all of the sounds are
> generated.
>
>
> William Boucher
> ----- Original Message ----- From: "andre" <livnfree_can@yahoo.com>
> To: <vectorlist@vectorlist.org>
> Sent: Tuesday, June 02, 2009 8:19 PM
> Subject: VECTOR: Armor Attack sounds and rom versions
>
>
> >
> > Got the Star Castle working fine, so moved onto the
> AA. I have 2 boardsets, bot seem to be different. Boardset 1
> has a sound board that does not state a game name on it.
> Boardset 2 has a soundboard that states Armor Attack on it.
> > -Boardset 1 works fine, sounds seem to be normal. The
> odd thing is is when a game starts, your jeep is not in the
> center.. it is over on the left side of the central large
> open area. Also, once a helicopter comes out, they
> repeatedly come out as soon as one explodes.... non stop...
> Is this a different version of this game or something messed
> up? All else seems to work as I remember it...
> >
> > -Boardset 2 seems to work fine, except for the
> sounds.. When you start you start in the middle, and
> helicopters have a delay between them so gameplay seems
> correct. The only issue on this is as the tanks speed up,
> the pitch of their engine noise speeds up but it becomes
> very distorted when it does. At its first speed, it sounds
> fine... just as you kill them and it speeds up does it get
> bad. I have replaced all the electrolytic caps on the sound
> board... any ideas what would cause that? Is the engine
> noise 'supposed' to change as they speed up?
> >
> >
> >     
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Received on Wed Jun 3 20:42:57 2009