21 Jul
2016
21 Jul
'16
4:07 p.m.
On 21 July 2016 at 23:26, Pete Turnbull <pete at dunnington.plus.com> wrote:
There's a thought. I'd be up for that, though it's not actually an A5000 I
meant; the A500 was the development system - looks rather like an A310 but
without the fancy front bezel, and painted blue/grey.
Ah, sorry, that was my mistake!
Um, isn't that pretty much what I wrote? I'm
pretty sure the first
batch(es) weren't rated for the full 200.
I don't know; I'm basing this comment mainly on Wikipedia.
Hmm. Never seen one like that. None of the ones I've seen in real life are
PQFPs, and none have a heatsink.
Perhaps you misread my message.
My point was that DEC's own Alpha RISC CPU was so dependent on good
cooling that the actual chip package included bolts to screw a
heatsink on.
In comparison, StrongARM, a DEC chip based on a licensed-in ISA,
needed so little cooling it shipped in a plastic package. No need for
ceramics here.
They're all plastic pin grid array
packages. No heatsink at all. Nor does the datasheet for the PQFP show
anything related to a heatsink. It also shows a PLCC version; no heatsink
there either, and again I've never seen one. Maybe that's just because I
normally only saw them in Acorn machines, of course.
You seem to misunderstand my remark about heatsinks.
It is also possible that I am misusing the term "PQFP" but I have
attempted to confirm it with Google image searches and I think it's
what I meant.
PQFP:
https://www.google.com/search?q=pqfp&safe=off&source=lnms&tbm=i…
StrongARM SA110:
https://www.google.com/search?q=strongarm+sa110&safe=off&source=lnm…
Is that not a PQFP chip? A flat plastic package with pins on all 4 sides?
I wish I'd kept an A500, though. All I have now
is the
podule to connect it to a Beeb. Anybody got the machine to put it in?
I have an A5000, near-new in box. But it's not been removed for about
15y and I've no idea what working condition it's in. I could post it
to you when I'm next in the UK -- probably early next month. If you're
interested, make drop me a line off-list. It's in my storage unit in
South Wimbledon, where I have no power or anything, so I can't
plausibly get it out and test it.
I am planning to move the rest of my stuff here to Czechia next month,
mainly for cost reasons due to the falling GBP. If you wished you
could come and meet me and inspect it in person? There were only a few
made. They were used internally during development - hence the podule to
connect it to a Beeb, which provided the I/O early on - and in the later
stages before the Archimedes launch in 1987, several were loaned to software
developers.
This is the machine Dick Pountain reviewed, I think.
--
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