Martinsburg, WV
I'm going to replace the battery with a Lithium coin battery. Is there a way to tell which end is positive/negative? I see no markings on the battery itself nor on the board.
(Topic ID: 191775)
Negative is the ground of the PCB. Positive goes to lug connected to R12. Need a diode too. Either change R12 to a diode with the band pointing to the top of the mpu or put a diode in series with the positive leg of the coin battery with the band pointing at R12.
NVRAM is plug and play on this MPU. $15 for a permanent no soldering solution.
Quoted from barakandl:Negative is the ground of the PCB. Positive goes to lug connected to R12. Need a diode too. Either change R12 to a diode with the band pointing to the top of the mpu or put a diode in series with the positive leg of the coin battery with the band pointing at R12.
NVRAM is plug and play on this MPU. $15 for a permanent no soldering solution.
Where's the best place to get the NVRAM? that's so you don't even need a lithium correct?
Quoted from TicTacSeth:Where's the best place to get the NVRAM? that's so you don't even need a lithium correct?
Hi,
You can find me on pinside store, ebay or my website http://nvram.weebly.com. Black Pyramid uses the -35 MPU, so you want the 5101 NVRAM for that system. It is going to replace the U8 chip on your Black Pyramid MPU. No battery needed after that. After install you will just want to make sure audits 16 and past are set to "03". The button inside the coin door cycles test mode/audits. The middle coin switch will clear most audits. The start button will advance the count of adjustable audits (16 to end).
Quoted from barakandl:Negative is the ground of the PCB. Positive goes to lug connected to R12. Need a diode too. Either change R12 to a diode with the band pointing to the top of the mpu or put a diode in series with the positive leg of the coin battery with the band pointing at R12.
NVRAM is plug and play on this MPU. $15 for a permanent no soldering solution.
Ordered a 5101 nvram from you. Thanks for the help. 
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