MicroVAX II Console Garbling Characters

Jerry Weiss jsw at ieee.org
Wed Aug 24 09:53:00 CDT 2016

> On Aug 24, 2016, at 9:41 AM, Rob Jarratt <robert.jarratt at ntlworld.com> wrote:
> I have a MicroVAX II which has started garbling and losing characters output
> to the console. It had seemed that re-seating the processor board would fix
> it, but that no longer seems to be the case.
> I was just wondering if anyone else has ever come across this failure mode?

I’ve seen similar  with under two occasions. 

1) Non-compliant USB adaptor - Doesn’t fully support RS232C levels
2) Poor grounding, noise in the data lines - long cable runs or devices on different sides of the (US) power main.

I have not dealt with component problems on the KA630 itself.


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