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From: Chris Newman <mec@npost.uk>
Newsgroups: comp.sys.acorn.hardware
Subject: Re: Disc Error ???
Date: Sat, 04 May 2024 22:24:32 +0100
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Message-ID: <5b5bf2de6bmec@npost.uk>
References: <5b59662272mec@npost.uk> <5b5a6ebda7a.m.conroy@owlart.co.uk> <5b5aada81cmec@npost.uk>
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In article <5b5aada81cmec@npost.uk>, Chris Newman <mec@npost.uk> wrote:
> In article <5b5a6ebda7a.m.conroy@owlart.co.uk>, Andrew Conroy
> <a.m.conroy@owlart.co.uk> wrote:
> > In article <5b59662272mec@npost.uk>, Chris Newman <mec@npost.uk>
> > wrote:
> > > Hi, 

> > > Every now and again I fire up the Risc PC to use the old scanner or
> > > to run Sibelius.

> > > On Saturday it didn't start up properly.

> > > After an aeon it eventually got the the green screen with the boot
> > > choices and an error box.

> > > Disc error 21 at :4/00 000 000 000 000 6

> > > The m/c has a Simtec unipod. It should boot from h-4 (Spinning
> > > rust). h-6 is an ssd for backup.

> > Disc error 21 is usually when the disc can't be found. The error is
> > from drive 4. Did the error come from ADFS or IDEFS? If you don't
> > have an ADFS drive fitted, maybe it's become configured to be there,
> > so not being found?

> Yes. M/c is looking for ADFS instead of IDEFS. How could that have
> changed?

> CMOS problem? 

RiscPC Strong ARMv4 Adjust 4.39 with Unipod.

To ensure the RPC boots from the Unipod, I was about to reset the
relevant configuration. I looked in the Unipod help guide, the Risc OS 3
User Guide and its release notes and got 3 different orders of events.

Does this look right?

*Configure Boot
*idefs       	selects the file system
*drive <N>    changes the current drive to N . Mine  h-4
*Opt4,2 <N>   changes the option on the current drive to N  (0 or 2)
*configure filesystem  IDEFS

Not quite sure why the Unipod instructions appear to have the fiesystem
being set twice.

Any enlightenment gratefully received.

-- 
Chris