Millipede RAM chips

harleymadman

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Does anyone know the best place to get RAM chips? I have a dedicated Millipede that I want to restore. When I power it up, the screen is blank, but I can hear a crackling in the monitor which might suggest a new cap kit. The sound beeps twice, then repeats. The troubleshooting guide in the manual says the E2(2114) chip needs to be replaced. I plan to de-solder the chip and put in an 18 pin socket, then replace the chip. Any advise for a beginner? Thanks

Bob
 
Does anyone know the best place to get RAM chips? I have a dedicated Millipede that I want to restore. When I power it up, the screen is blank, but I can hear a crackling in the monitor which might suggest a new cap kit. The sound beeps twice, then repeats. The troubleshooting guide in the manual says the E2(2114) chip needs to be replaced. I plan to de-solder the chip and put in an 18 pin socket, then replace the chip. Any advise for a beginner? Thanks

Bob

Try coinopchips.com.
 
Does anyone know the best place to get RAM chips? I have a dedicated Millipede that I want to restore. When I power it up, the screen is blank, but I can hear a crackling in the monitor which might suggest a new cap kit. The sound beeps twice, then repeats. The troubleshooting guide in the manual says the E2(2114) chip needs to be replaced. I plan to de-solder the chip and put in an 18 pin socket, then replace the chip. Any advise for a beginner? Thanks

Bob
BE very very careful replacing those 2114 ics - the traces are very thin and get damaged very easily. I suggest cutting all of the ic leads and removing them one by one, then cleaning the solder with your favorite method. Check for continuity or any shorts then socket the replacement 2114.

Bill
 
+1 to chopping the legs off and removing them one by one. The only downside is that you have no way to test the chip once it is off the board. If you have no way to test the chip anyway its no great loss, but when a board reports a RAM chip is faulty all it really means is that it put some data on the bus with the RAM chip setup to store the info, then it read it back out and found the data was different, the board reports this as a fault with a RAM chip, but it can easily be, and often is, the controlling logic that is faulty not the RAM chip. RAM is always a very good place to start with any fault tho.

Also, when you come to clear the leg holes with a solder sucker, make sure you have the sucker pull solder through the hole away from the track going to that pin where possible. The tracks are fragile when heated and if you suck from the track side of the board you may find the track and pad gets sucked up with the solder, which is a real pain to fix neatly.
 
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Speaking of RAM chips for Millipede, anyone know where to source 74289 64 bit RAM??? Millipede uses a couple of these, and one went bad - still have a picture, just looks like its missing some colors....
 
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