IBM 5151 (MDA display) - common faults / gotchas?

Chuck Guzis cclist at
Sun Nov 9 10:43:44 CST 2014

I'll add this to the 5151 issue.   Because the 5151 responds to *every* 
horizontal sync pulse, it's quite possible to toast the flyback 
transformer with the wrong frequency.  I know--I've done it.

Contrast with a simple astable multivibrator which would simply lose synch .


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