On 08/24/2016 09:53 AM, Jerry Weiss wrote:
On Aug 24, 2016, at 9:41 AM, Rob Jarratt <[email protected]> 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.
The console interface is a set of 9636, 9643 and 9639 chips
(8-pin DIP). I had mine blown out about 1988 or so when a
power supply failed. There are a couple capacitors and
resistors related to that circuitry, too.
Jon
