Howdy!
I'm posting this "Tutorial for Dummies" as I've received at least 3 requests on how I did this, even though it's been posted in several other forms elsewhere. I am not claiming that I came up with any of this…I have zero knowledge on anything electronics oriented (I'm like a Kindergartner when it comes to that), and all I know came from here:
http://www.ionpool.net/arcade/mcr/dot/index.htm
http://girasoli.org/arcade/?p=203
DOT Operating Manual (S&T Schematic):
http://arcarc.xmission.com/PDF_Arca...ron_Parts_and_Operating_Manual_(Aug_1983).pdf
And Bungy's thread here:
http://forums.arcade-museum.com/showthread.php?t=137680
As with most of my projects, I got a lot of help from JeffC and Bungy helped as well.
So I'm going to attempt to make this a sort of cook book type thread, with step by step directions, using limited "electronics" terms, so "dummies" like me can do it. I'm not going to claim that this is 100% right, but it worked for me.
What you need:
-A Squawk and Talk board (non-pinball), part number A084-91660-B000 (or C000)
If it's not already set to go, you'll need:
-Three 2532 EPROMs burned with the associated ROMs (can get from MAME or some members here) at U3, U4, U5 (see schematic)
-If you get an unpopulated board, you'll also need (1) 6802 (processor), (2) 6821 (interface), (1) 5200 (sound)
-If you don't know what any of this is, there are lots of people here who can burn these for you, and this is the info you'll have to give them. Usually, whomever you buy the board from can do this for you.
-A 5k ohm potentiometer (mine was an ugly one from Radio Shack)
-One 1.0UF 50V 20% ceramic radial capacitor (Bob Roberts or wherever)
-One 13K 1/4w resistor (I couldn't find one, so I soldered a 12k and 1k together and tested it with my multimeter first to make sure it was correct)
-16+ multicolored wires about 2 ft long (some with alligator clips help)
-a switcher to power the board (I ended up using the heavy duty one with the adapter supplied by Arcadeshop.com http://www.arcadeshop.com/mcr/mcr.htm )
In the end, you'll have a mess that looks like this:
For reference:
SSIO:
Squawk & Talk:
Before you do anything, make a list of all of your connections and assign them to your colored wires and label them. My list looked like this:
I'm posting this "Tutorial for Dummies" as I've received at least 3 requests on how I did this, even though it's been posted in several other forms elsewhere. I am not claiming that I came up with any of this…I have zero knowledge on anything electronics oriented (I'm like a Kindergartner when it comes to that), and all I know came from here:
http://www.ionpool.net/arcade/mcr/dot/index.htm
http://girasoli.org/arcade/?p=203
DOT Operating Manual (S&T Schematic):
http://arcarc.xmission.com/PDF_Arca...ron_Parts_and_Operating_Manual_(Aug_1983).pdf
And Bungy's thread here:
http://forums.arcade-museum.com/showthread.php?t=137680
As with most of my projects, I got a lot of help from JeffC and Bungy helped as well.
So I'm going to attempt to make this a sort of cook book type thread, with step by step directions, using limited "electronics" terms, so "dummies" like me can do it. I'm not going to claim that this is 100% right, but it worked for me.
What you need:
-A Squawk and Talk board (non-pinball), part number A084-91660-B000 (or C000)
If it's not already set to go, you'll need:
-Three 2532 EPROMs burned with the associated ROMs (can get from MAME or some members here) at U3, U4, U5 (see schematic)
-If you get an unpopulated board, you'll also need (1) 6802 (processor), (2) 6821 (interface), (1) 5200 (sound)
-If you don't know what any of this is, there are lots of people here who can burn these for you, and this is the info you'll have to give them. Usually, whomever you buy the board from can do this for you.
-A 5k ohm potentiometer (mine was an ugly one from Radio Shack)
-One 1.0UF 50V 20% ceramic radial capacitor (Bob Roberts or wherever)
-One 13K 1/4w resistor (I couldn't find one, so I soldered a 12k and 1k together and tested it with my multimeter first to make sure it was correct)
-16+ multicolored wires about 2 ft long (some with alligator clips help)
-a switcher to power the board (I ended up using the heavy duty one with the adapter supplied by Arcadeshop.com http://www.arcadeshop.com/mcr/mcr.htm )
In the end, you'll have a mess that looks like this:
For reference:
SSIO:
Squawk & Talk:
Before you do anything, make a list of all of your connections and assign them to your colored wires and label them. My list looked like this:

