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Author Topic: Exploding EPROMs  (Read 4089 times)
jdkmunch
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« on: February 17, 2009, 05:58:31 PM »
I just got my GQ-4X programmer and have a few questions.   

I read that reading a 5500/6000 personality chip the wrong way can damage it.   Is there anything I need to know before trying to read these chips?  I would like to make backups.
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channelmaniac
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« Reply #1 on: February 17, 2009, 06:04:52 PM »
Just make sure you have the programmer set for the correct chip type and that you insert it properly.

EPROMs generally have their power and ground pins on opposite corners. This means that if you insert them backwards you are applying voltage backwards. This is what damages the chip.

RJ
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« Reply #2 on: February 17, 2009, 06:29:40 PM »
Not being terribly strong in electronics.... but it would seem to me that they could eliminate a lot of damage if they simply built in a diode to the chips that controlled the flow of electricy.

Ideally putting power on the top 2 pins would make the most sense, along with adding a dud set of pins to the other end.
That way if you put them in backwards you would not be able to do damage.
I know that this would change the way burners are built, take up extra space, erode sales of chips etc etc.

Comments ?

Or they could just put a notch on one end of the chip and assume anyone who was handling the chip was not a dumbass and knew what they were doing ..... oh wait...  frying pan
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jdkmunch
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« Reply #3 on: February 17, 2009, 06:32:14 PM »
That notch thing would be a great idea
 rotflmao  Tongue Out
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tacman
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« Reply #4 on: February 17, 2009, 06:40:19 PM »
What notch thing??  arrow arrow arrow

 Dan (tacman)
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« Reply #5 on: February 17, 2009, 08:09:28 PM »
I try to notice the notch but every now and then I screw up and put them backwards (when reading).  My programmer shuts it's power down when I do this and I have to unplug the power and plug it in again for it to reset.  So far I haven't exploded any.

Thanks,
Wayne
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Slotmaster
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« Reply #6 on: February 17, 2009, 09:38:07 PM »
I have yet to cook an eprom in a programmer but have for sure in a MPU when backwards.

Just gets really hot with no explosion.
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a69mopar
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« Reply #7 on: February 17, 2009, 11:23:14 PM »
On a Bally s6000 putting the mains in backwards can alter the chip so it wont work, the eprom is still good, just the programming changes.  Always keep a backup.

W
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jdkmunch
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« Reply #8 on: February 17, 2009, 11:49:05 PM »
OK as long as there is no trip wire that can damage the chip.  I shall back them up.
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KirkLasVegas
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« Reply #9 on: February 18, 2009, 12:45:10 AM »
It's really simple....
*TAKE A PICTURE* of the entire board before you pull anything off of it.I can't tell you how many times this has saved my butt in the past.
A silver "Sharpie" is good for placing a dot by the notch in the chip and on the PCB. Usually all chips will face the same direction on a PCB, but not always!
Some PCB's will have an outline on the board, others will have a #1 on the printed side. Others will have a square pad by pin one and round pads everywhere else.
Programmers....
ALWAYS...ALWAYS! set the switches before you drop a chip in the ZIF socket! Double check it. Nothing will piss you off more than to kill a chip you want to Read/Copy.Trust me on this one..it will spoil your day!

Hope this helps!

Kirk in Las Vegas
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