Re: Helios C- and timing-question...

Erik Baigar wrote:
> board lacks some vital signals). At the moment I
> am still not really happy with the stability - the machine
> crashes from time to time or fails to boot in 1 out
> of 10 trys. This is due to my setup (10cm of ribbon
> cable for signals) and I guess power issues (trapu
> fails below 4.8V). But this can be solved...

Indeed two main causes for instability (both solved
now):

(a) Doing nothing, the trapu board needs approx 1.4A
including my IO circuitry. But running there are
currents of over 2 amps needed. Supply voltage
dropping below 4.85V here will likely lead to
spontaneous crashes -> Use thick wires and supply
beeing strong enough!

(b) Had ground noise problems in connecting the oscilloscope
leading to reduced reliability if oscilloscope was connected. ->
Solved by proper grounding.

The 10cm of ribbon cable connecting NotMemS0, NotMemS1,
NotMemWR0,... to my piggy back board containing the
IO-circuitry is no problem (Ground on even lines,
signals on odd ones).
.

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