The Iyo Double Shuffle

[Chris F]

Has it been established why pressing the elliptical button followed
shortly by pressing the circular button on the front of the Iyonix, is
more likely to result in a non-pyjama screen? Or is this just a
peculiarity of my machine?

(I run Geminus at startup but I've never had two pyjama screens.)

--
BW Chris F. [ British Iyonix, RISC OS 5.13 & A9 ]
"The One Legged Shunter". Real ale at the Foxfield Railway! (ST11 9BG)

[davehigton]

On 11 Nov, 11:36, Chris F <c.n....@virgin.net> wrote:
> Has it been established why pressing the elliptical button followed
> shortly by pressing the circular button on the front of the Iyonix, is
> more likely to result in a non-pyjama screen? Or is this just a
> peculiarity of my machine?

Established: No.

Theorised: No.

Here's a hypothesis, though. The extra time spent in reset
allows two things: (1) the power supply's voltage may change
slightly; (2) the chips heat up and thus slow down slightly,
changing operation in some way. Even the amounts of
overshoot and undershoot on signals may be reduced by
the slight slow-down.

In order to raise the hypothesis to a theory - or in order to
dismiss it as wrong - it would have to be tested.

Dave

[druck]

Chris F wrote:
> Has it been established why pressing the elliptical button followed
> shortly by pressing the circular button on the front of the Iyonix, is
> more likely to result in a non-pyjama screen?

The pyjamas is caused by incorrect initialisation of various chips at
power up, possibly due to power supply instabilities. Pressing the reset
button after power, restarts all the chips when the power supply is more
stable.

> Or is this just a peculiarity of my machine?

It affects a small number of machines.

---druck

[Chris F]

In message <4AFB1F63...@druck.org.uk>
druck <ne...@druck.org.uk> wrote:

> It affects a small number of machines.
>
> ---druck
>

Thanks

--
BW Chris F. [ British Iyonix, RISC OS 5.13 & A9 ]

Visit www.foxfieldrailway.co.uk (Because you're worth it.)

[Tim Hill]

In article <4AFB1F63...@druck.org.uk>, druck <ne...@druck.org.uk>
wrote:

> Chris F wrote:
> > Has it been established why pressing the elliptical button followed
> > shortly by pressing the circular button on the front of the Iyonix,
> > is more likely to result in a non-pyjama screen?

> The pyjamas is caused by incorrect initialisation of various chips at
> power up, possibly due to power supply instabilities.

Or room temperature. Or so it seems here. Like my wife's pyjamas, the
phenomenon only puts in an appearance when it's cold.

Pressing reset invariably sorts it out.

[Snip]

--
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Genuine spam-proof addresses for Usenet: http://www.invalid.org.uk/
Email address for replies: substitute postmaster@ for tim@

... "O, spirit of love, how quick and fresh art thou !" Twelfth N, Act i, Sc.1

[M Harding]

In article <50b992...@invalid.org.uk>,

Tim Hill <t...@invalid.org.uk> wrote:
> In article <4AFB1F63...@druck.org.uk>, druck <ne...@druck.org.uk>
> wrote:
> > Chris F wrote:
> > > Has it been established why pressing the elliptical button
> > > followed shortly by pressing the circular button on the front
> > > of the Iyonix, is more likely to result in a non-pyjama screen?

> > The pyjamas is caused by incorrect initialisation of various
> > chips at power up, possibly due to power supply instabilities.

> Or room temperature. Or so it seems here. Like my wife's pyjamas,
> the phenomenon only puts in an appearance when it's cold.

> Pressing reset invariably sorts it out.

> [Snip]

Care to re-phrase those sentences and paragraphs, especially when
they're read together? 8-)

Michael Harding
Rev. Preb. M.D. Harding ris...@mdharding.org.uk

[Tim Hill]

In article <50b99941...@mdharding.org.uk>, M Harding

> > [Snip]

.. and before anyone asserts, I am a man who can find his lady's 'reset
button'. ;-)