(Topic ID: 158229)

Bally 2518-32 and 2518-50 sound boards

By CadillacMusic

6 years ago


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  • 15 posts
  • 5 Pinsiders participating
  • Latest reply 2 days ago by Quench
  • Topic is favorited by 1 Pinsider

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#1 6 years ago

Hi guys. Tdiddy recently got a paragon, but his sound wasn't working. I took the u3 ROM (729-51) from his board and replaced it with one from a working Star Trek (729-18). His then worked fine, or close enough to fine. I've been trying to repair the donor board. I took an unknown condition 729-18-32 board's u3 and tried that. No joy. It plays one monotonous tone, instead of varying up and down. So the sounds have correct sustain and rhythm, but not pitch. It does this even with the u3 chip removed. So I'm assuming both Tdiddy's u3 and the donor board's u3 are bad. Does anyone burn these puppies anymore? I know k's arcade sells an adapter, but since tdiddy's paying for all the parts, I'm trying to go cheaper.

#2 6 years ago

Can you burn a 2716 EPROM? I can send you an adapter, but I can't really sell them with the EPROMs.

A single tone that doesn't change pitch, but is in the correct rhythm is usually the PROM.

#3 6 years ago

I can sure burn them. But how much does the adapter cost?

#4 6 years ago

Oh wow, you have 6821 PIAs? I gotta get me some of those. Got a giant stack of broken system 11 boards.

#5 6 years ago

I've been selling these for a few years..

http://www.pinitech.com/products/bally_sound_prom.php

Recently added some DIY Kit options as well and bulk discounts.

#6 6 years ago

Ooo, I like your stuff. I didn't know anyone made cheap tester stuff. Why is it I'm just hearing of these now? I can totally convince my bosses to buy a tester if it's only 10 bux. That way I don't have to mess with breadboards.

#7 6 years ago
Quoted from CadillacMusic:

Ooo, I like your stuff. I didn't know anyone made cheap tester stuff. Why is it I'm just hearing of these now? I can totally convince my bosses to buy a tester if it's only 10 bux. That way I don't have to mess with breadboards.

Main reason is test equipment isn't the cool kid on the block There's a very small percentage of people interested in those types of products so any threads about test equipment vanish pretty quick here versus threads on new games, leds, led mods, etc. Not uncommon for people to not realize this stuff even exists unless they trip across a discussion about a new product.. or someone links the website.

#8 6 years ago
Quoted from CadillacMusic:

Oh wow, you have 6821 PIAs? I gotta get me some of those. Got a giant stack of broken system 11 boards.

I still have a few hundred MC6821P left. Lots of MC6802P CPUs too.

Quoted from acebathound:

Main reason is test equipment isn't the cool kid on the block There's a very small percentage of people interested in those types of products so any threads about test equipment vanish pretty quick here versus threads on new games, leds, led mods, etc. Not uncommon for people to not realize this stuff even exists unless they trip across a discussion about a new product.. or someone links the website.

I think its clear the testers need MORE LEDs and custom toppers! =D

#9 6 years ago
Quoted from barakandl:

I think its clear the testers need MORE LEDs and custom toppers! =D

Yeah really. Something to draw attention. Blinking LEDs sell anything!

At the grocery store check-out line they have those eye glass repair kits with this cartoon face on it with blinking leds for eyes. You don't get to take the blinking leds home, but they sure do make an eye glass repair kit seem more exciting. Until you purchase one anyway

6 years later
#10 4 days ago

Sorry to resurrect an old thread.

I've just got a box of Bally boards to play with and I have 3 sound boards 2 x -32 and 1 x -50 - all missing a random variety of ICs.

I've managed to source U10, U9, and U5

I'm having trouble finding U11 which is missing on the -50 and is an M86L93 on the other boards

I'm also missing U3 from 2 of the boards. for the games I want to use these boards in I would need E-729-18. I imagine it is impossible to find this chip and that an eprom has to be used. Just wondering if anyone can help me out here?

#11 3 days ago
Quoted from Grefla:

Sorry to resurrect an old thread.
I've just got a box of Bally boards to play with and I have 3 sound boards 2 x -32 and 1 x -50 - all missing a random variety of ICs.
I've managed to source U10, U9, and U5
I'm having trouble finding U11 which is missing on the -50 and is an M86L93 on the other boards
I'm also missing U3 from 2 of the boards. for the games I want to use these boards in I would need E-729-18. I imagine it is impossible to find this chip and that an eprom has to be used. Just wondering if anyone can help me out here?

86L93 is the "tenth power" version of 7493 and 74LS93 can replace it. This chip fails A LOT on the -32 and -50 sound boards

The PROM is majorly obsolete but can be replaced with a standard EPROM and maybe some other devices like a GAL, but you have to shift the pins around.

#12 3 days ago
Quoted from barakandl:

The PROM is majorly obsolete but can be replaced with a standard EPROM and maybe some other devices like a GAL, but you have to shift the pins around.

I saw on a previous thread that you used to make adapters for EPROMs to go on these boards. Do you still make them?

#13 3 days ago
Quoted from Grefla:

I saw on a previous thread that you used to make adapters for EPROMs to go on these boards. Do you still make them?

No, but I make the entire board now. $100

#14 2 days ago
Quoted from barakandl:

The PROM is majorly obsolete but can be replaced with a standard EPROM and maybe some other devices like a GAL, but you have to shift the pins around.

I think I’ll try and make an adapter for a 2716 using sone sockets. Which pins need to be shifted?

#15 2 days ago
Quoted from Grefla:

I think I’ll try and make an adapter for a 2716 using sone sockets. Which pins need to be shifted?

For adapter wiring, see here:
https://pinside.com/pinball/forum/topic/bally-sound-board-as-2518-32-constant-tone#post-5323698

Sound-32b.png

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