[Techtoolslist] 9010 ram pattern error?

[Tony Jones]

On Sun, Apr 2, 2017 at 5:46 PM, David Shoemaker <davids at oz.net> wrote:
> I have never been able to wrap my head around the pattern error.

The long test is looking for pattern sensitive errors (nearest neighbor).

What happens if you LOOP (see 4H-11 in the operators manual).

I've seen similar on a (non arcade) board with a bad bus transceiver
but it can also indicate a fault in the RAM itself.