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(Topic ID: 193108)

EK MPU Issues

By Billc479

6 years ago



Topic Stats

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  • 4 Pinsiders participating
  • Latest reply 6 years ago by Billc479
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#6 6 years ago
 
BIF

CactusJack

Pinside member

US Lake Forest, CA

10y 80,050 4,200 93

Flakey 5101 ram can cause that kind of issue. So you could have a problem with your NVRam or it's socket.

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#8 6 years ago
 
BIF

CactusJack

Pinside member

US Lake Forest, CA

10y 80,050 4,200 93

Not exactly. A 68B21 is simply at 2 Mhz version of a 6821. I can't remember what changed between the early 20's and the later 21's.

And since the system is only running at around 500-800 KHz, it works fine with either.

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