On Tue, 29 Oct 2002, Jules Richardson wrote:
> Tony (and others),
>
> > I have the schematics of the ST225 somewhere.
>
> I misremembered about the drive - I've just had the case off the machine to get
> some pictures in response to Stefan's post about the P4500 (at
> www.moosenet.demon.co.uk/temp/p3800 for anyone who's interested)
>
> The drive's a Rodime 202E which going from memory is 50MB or so.
No, it is 21MB.
> I'm quite keen to see if I can get this thing running now as it's got me
> curious. The key at the front has 3 settings - off, on and 'pm' - I have no
> idea what the latter does but the abbreviation might mean something to
> someone??
>
> Applying power I get LEDs on the back of all cards, plus one labelled as +5V on
> the power supply board. No fan activity though and no hard disk spindle motor;
> maybe a +12V rail is dead or the problem might be more tricky to diagnose.
Absent 12V seems like the most likely problem, and the thing to check
first.
- don
> There's five LEDs on the front of the case - labelled 1,2,3 and 4 plus one with
> a power symbol - none of those light when power is applied.
>
> Might be something stupid like the system is waiting for a console command
> before starting the disk but that's probably a little too hopeful :-)
>
> There's 6 cables hanging out the back, all terminated with 25 pin connectors.
> One's black and unlabelled, another is grey and unlabelled, and all the rest
> are grey and labelled as: '8 bit 3100', '16 bit 3100' '8 st' and '8 st4'. Mean
> anything to anyone? Are those terminal types or something?
>
> I'll reseat all the cards tomorrow and measure a few voltages to see what's
> what - plus connect the hard drive to a known-good supply and just check it
> does spin up.
>
> IC dates are all in 1984 so it's more recent than I thought (I'd guessed '82 or
> so) but no idea when it last ran or what it was used for. Hopefully the disk
> wasn't wiped prior to it being submerged in a flood! :)
>
> cheers
>
> Jules
>
>
>
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Received on Tue Oct 29 2002 - 19:09:00 GMT