1 Jan
2018
1 Jan
'18
10:07 a.m.
On 01/01/2018 11:22 AM, Rob Jarratt via cctalk wrote:
I just replaced the last of the electrolytics, but the
spikes on the Z80 5V
rail have not gone away. They only exist on the 5V rail in close proximity
to the Z80, other chips with a 5V supply don't have the spikes on the 5V
rail.
It could be caused by bus contention, which may also be the
cause of the resetting. Possibly some of the
decode logic has failed, and is allowing two devices to
drive the data bus at the same time. I've seen this
before, and it does cause spikes on the 5V rails.
Jon