Asteroids upright - tones when blowing things up instead of crash sounds

infotime

New member
Joined
Apr 22, 2011
Messages
30
Reaction score
0
Location
Louisville, Kentucky
Asteroids upright - tones when blowing things up instead of crash sounds

I bought my first machine this week, my favorite of all time: Asteroids. After two days the PCB crapped out and I bought a replacement PCB which worked fine, except:

When you blow up a rock or an alien ship it makes a musical tone. When you thrust to fly your ship there is no sound. Every time I've ever played Asteroids there's a crashing / splashing sound when you hit things.

This board is not identical to the one it replaced. There is a small red jumper wire connected to the bottom of the board. It also has an extra DIP switch block with four switches. Wonder if those control the sounds? (Maybe not, I found a link that says that block is not used)

Is there a way to get the "normal" sounds with this replacement board? i.e. DIP switch settings, steal some EPROMS from the bad board, etc.?
 
It would be trouble in the sound section of the board not an eprom or a setting. I'd look for any physical damage there to traces or the capacitors there.
 
Asteroids board sets went through something like six revisions. The board layout can look quite different on some revisions. My guess, this is why your board sets look different.

Regarding your sound issues......For the missing thrust sound, I'd start at the op-amp at location P11 (or location P12, depending on the motherboard revision). A couple of "sound signals" get mixed together to create the thrust sound/rumble. If you get any kind of noise/sound when thrusting, you're gonna have to backtrack into the separate "noise" singals.

All explosion sound signals exit the databus at location P7. You've got "explosion sound" signals and "explosion pitch" signals exiting P7. The "pitch" then goes through a bounch of stuff...chips N6, L5, D6, P8 (or P9, depending on revision), R8 (or R9), and finally mixing with the "sounds" at chip R7. Any of these could be at fault.

As EVB stated, sounds are not controlled by dip switches.....nor are they stored in a ROM/EPROM. All Asteroids sounds are created with discrete logic.

Edward



Edward
 
Things got worse :(

Screen shifted, everything shows in the right-half of the screen.

I've got another thread going over in Technical - Videogames - General Repair And Help

See Just bought my first arcade game - Asteroids, 2 days later won't work. Figured I'd link to it so I don't have two threads going about the same topic.

I'd love some more input over there if you can.

Thanks!
 
Back
Top Bottom