Space Duel saving high score question

DKJR

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I just got my SD pcb working. (clink of beer mug). It never saved high scores. I have it on free play. After a game ends the coin door area makes a loud clicking noise like when the machine is fired up. I didn't know what socketed chip is responsible for saving data. And frankly I don't know if I want to mess with what's technically not broke.....but you guys know how it is with this hobby. All my games are work right now so I'm bored just playing them ...LOL
 
Bob Roberts sells ER-2055s for $4. Also available here: http://www.arcadechips.com/product_info.php?products_id=30

jrok also created a modern replacment, which doesn't require the wacky voltage (-29V?) that the 2055 needs: http://www.jrok.com/hardware/earom/

That reminds me... you might want to check to make sure your IC is getting the proper voltages before replacing it.

EDIT: Should be -28V @ pin 14 of the ER2055 @ M2. If it's present, suspect your ER2055. If absent, check your +15V & -15V supplies and call back.
 
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Slakmore Im bling thank you I see postition. Counter never thought of that I'll keep coin door open and kill my self off and see what goes on. However, Jorks site only talks about dig dug centipede and millipede but not the space duel for that newly remade chip. anyone have one of these or know?
 
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I don't think Jorks is a option as there's no way I see to order from the website. I've tried contacting the website but who knows if emails current. Last update is in 09
 
What position do I check voltages for that and on what settings with the multi metter and do you do it with the red or black never done this before sorry for noon questions
 
So do I only use one tester prob at a time then? Example black prob on 14 pin etc. Or same time just don't want to fry board? And I'm assuming game must be powered up.
 
What position do I check voltages for that and on what settings with the multi metter and do you do it with the red or black never done this before sorry for noon questions

Depends on your multimeter. If it's auto-ranging, set it on DC Voltage. If it's not auto-ranging, set it on the DC voltage range just greater then 30V; this will most likely be the 200V range (ranges are commonly 2, 20, & 200).

Find the chip on your PCB. With the game power on, CAREFULLY put the meter probes as shown in the attached diagram. Note the "notch" circled in green, which shows you which end of the chip is which.

Also, the period key on your keyboard is often located just below the "L" key. Use it to seperate you thoughts into sentences. It'll make reading your posts easier on the rest of us.

EDIT: Some chips, instead of the "notch," have a dot by pin 1 to indicate orientation. And yes, both the black and red probes need to touch both pins at the same time. And don't sweat mixing up the red and black probes; it won't "fry" anything, it'll just reverse the sign (+/-) of the reading. The only ways to potentially damage things are to (1) accidentally short out things (like the -29V line) to something else, or (2) use a DMM mode which has low impedence, such as current mode.
 

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I think I can figure that out with your great help. And thanks for being hands on with a noob testing stuff. Been afraid kind of. But gotta get hands dirty sooner or later
 
Been right there with you - the high-score save chip on Space Duel was my first introduction to the world of electronics, schematics and chip socket cleaning.

M.O.
 
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