Re: Bubbles Sounds

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Stargate (Vid. Snd. 2) and Defender (Vid. Snd. 1) use most of the same
sounds as well...and the later sound boards can be strapped for the Video 1
Snd Rom.

John :-#)#

At 04:31 AM 12/17/00, Jess Askey wrote:

>Also, defender used a different style board as compared to the later
>Williams vids so
>it is unlikely that you actually have 'defender' sounds. Lots of sounds
>are used between
>many of their games so it can be easy to get things confused.
>
>If you do indeed have a bubbles sound rom installed but the sounds coming
>out don't
>quite sound right then you may want to check the following...
>
>1. Put the game into sound test. You will see that it plays sounds like
>this...
>
> Sound line 1
> Sound line 2
> Sound line 4
> Sound line 8
> Sound line 16 (doesn't do this one)
>
> Now I think that sound line 16 *is* actually used in the game else you
> would
> be limited to only 15 sounds (16 or Hexidecimal $F or binary 11111 is
> no sound
> command)
>
> So during the sound test you should be able to see 4 of the 5 sound
> lines pulse
> to verify that they are actually working correctly. If not, suspect the
> PIA on
> the motherboard.
>
>3. There are also two DIP switches on the sound board, make sure these are set
> correctly for your game. They effect the high order command lines of
> the sound
> board. If they are incorrect, you will get a different range of sounds.
>
>4. If you look at the schems, you will also see that this sound board was
>built
> to be very versatile. This board was used in just about all the video
> games
> and in a large section of their pins as well. Since these boards are so
> abundant, there is a chance that this is not the orignal board. So,
> you need
> to verify that the sound ROM jumpers are correct (there are settings
> for both
> 2716 and 2532/2732 EPROMS). All the vids used XX32 EPROMS while the
> pins used
> smaller 2716's. I doubt this is your problem tho since when these
> jumpers are
> incorrect, you rarely get a running sound CPU. BUT.. there are also some
> jumpers that effect the sound command inputs. Get a schematic of the
> sound
> board and study these to make sure they are all correct. New Williams
> schems
> such as Sinistar have more info printed on them as compared to the older
> schems (stargate,robotron,joust).
>
>5. Sound commands come from the CPU motherboard and are sent to the sound
>board via
> 5 command lines. It is *very* common on these sound boards for cold
> solder joints
>to develop underneath the molex connector. The problem is not that the pin
>gets an
>intermittent connection with the PCB but more that the plate through
>'cylinder'
>actually develops cracks around itself and the traces on the board.
>Particular to
>the sound command connector, there are traces that only connect to the
>pins on
>the top side of the PCB (directly under the white plastic of the male side
>molex)
>So, even if you solder the hell out of all the pins on the bottom of the
>board,
>there will still be a cold solder joint on the top side. You need to remove
>the whole PCB side molex connector and then resolder the plate through
>column to
>the top side trace. It is difficult to get the molex out of the PCB
>sometimes and
>it can be easy (unfortunately) to ruin some traces on teh PCB doing this
>procedure
>if you are not very careful. The pins and the plate through have a pretty
>tight
>connection even without old solder being in there. I have had this problem on
>lots of my pins. A good way to see if this may be a problem before going
>through
>the agony, is to put the game in sound test and then twist the connector
>in multiple
>directions and see if your sounds start changing, this would suggest a bad
>solder
>connection.
>
>
>Whew, long winded, but I hope it helps. Post more info when you get it.
>
>jess
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Received on Sat Dec 16 10:20:45 2000