On 21 July 2016 at 23:26, Pete Turnbull <p...@dunnington.plus.com> wrote:
> 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=isch&sa=X&ved=0ahUKEwjSy5jp04XOAhUCsxQKHdGLBZIQ_AUICCgB&biw=1650&bih=985 StrongARM SA110: https://www.google.com/search?q=strongarm+sa110&safe=off&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiT-Mbv04XOAhXB1hQKHUb4CxQQ_AUICSgC&biw=1650&bih=985 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'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! > 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. -- Liam Proven • Profile: http://lproven.livejournal.com/profile Email: lpro...@cix.co.uk • GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lpro...@hotmail.com • Skype/AIM/Yahoo/LinkedIn: liamproven Cell/Mobiles: +44 7939-087884 (UK) • +420 702 829 053 (ČR)