Search found 4 matches

by ijor
Tue Sep 01, 2020 8:34 pm
Forum: 8-bit acorn hardware
Topic: 8271 disc controller de-cap and craziness -- do not try this at home!
Replies: 449
Views: 21615

Re: 8271 disc controller de-cap and craziness -- do not try this at home!

The patent is an amazing finding, congratulations. And the complexity and the size of this chip it is also amazing. It is a true behemoth. No wonder it was so expensive and consumes so much power. I'll try later to post a die shot of the first WD FDC, tiny in comparison. To give you an idea of the d...
by ijor
Mon Aug 31, 2020 2:05 am
Forum: 8-bit acorn hardware
Topic: 8271 disc controller de-cap and craziness -- do not try this at home!
Replies: 449
Views: 21615

Re: 8271 disc controller de-cap and craziness -- do not try this at home!

.. but I am now starting to wonder if, with WD first, many computer manufacturers took up the 8271. I can't say if the early WD ones were much more popular, may be, I don't really know. But if the 8271 was late and expensive, and according to you it used to run very hot, then that might explain it....
by ijor
Sun Aug 30, 2020 3:15 pm
Forum: 8-bit acorn hardware
Topic: 8271 disc controller de-cap and craziness -- do not try this at home!
Replies: 449
Views: 21615

Re: 8271 disc controller de-cap and craziness -- do not try this at home!

It is quite surprising to see the simplicity of the 1772... perhaps the 8271 has more moving parts because it's built as a customisation and an adaptation of something else ... We know the 8271 was earlier, and was expensive. Perhaps Intel were motivated to get something out early and were able to ...
by ijor
Sun Aug 30, 2020 6:54 am
Forum: 8-bit acorn hardware
Topic: 8271 disc controller de-cap and craziness -- do not try this at home!
Replies: 449
Views: 21615

Re: 8271 disc controller de-cap and craziness -- do not try this at home!

Hi, I'm not an Acorn user. Ed (BigEd here) commented about this thread on some mailing list we participate. I don't have much experience with this specific FDC, the Intel 8271. But I have considerable expertise reverse engineering other FDCs, mainly from the WD family. Again, I am not familiar with ...

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