Last Gasp for the 8271

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BeebMaster
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Last Gasp for the 8271

Post by BeebMaster » Tue Apr 16, 2019 8:40 pm

Amazingly, or maybe even adorably, I still get a handful of requests for the trusty old 8271 every year. I think I may now have sourced some after a few years of drawing a blank, I'm just seeing if I can get a reasonable price on them. If I can I might try to do a very very very last ever never to be repeated once in a lifetime (again) batch of 8271 upgrade kits. Would there be any interest? Are there even any tape-only Beebs left? Or maybe just the 8271 chip itself, for the Beeb, or Atom/System clones?
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Re: Last Gasp for the 8271

Post by roland » Tue Apr 16, 2019 9:04 pm

Well, name your price and I'll decide if I want one or two 8271's. The parts of the Atom FDC board are easy to get or even to replace by a (single) CPLD but the 8271 is a show-stopper when it comes to recreating the FDC board. So one or two controllers might be welcome.
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Re: Last Gasp for the 8271

Post by danielj » Tue Apr 16, 2019 10:04 pm

Likewise, let me know roughly what you think the price would be...

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Re: Last Gasp for the 8271

Post by KenLowe » Tue Apr 16, 2019 10:23 pm

Same here. Interested in a couple, subject to knowing the price...

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Re: Last Gasp for the 8271

Post by guesser » Wed Apr 17, 2019 12:09 am

I've got a tape only beeb, but I've got two others and I think the tape only one had some fault that I never investigated.
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Re: Last Gasp for the 8271

Post by duikkie » Wed Apr 17, 2019 4:46 am

i like the 8271 chip , nice things to program. and make protected discs :shock: :D

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Re: Last Gasp for the 8271

Post by Kazzie » Wed Apr 17, 2019 6:33 am

I'll be wanting an 8271 for my System clone, and would be happy to join in with a bulk order.

(I had planned on fitting a 1770 to my Beeb and cascading the 8271, but the Vine Replay that it's fitted with is 8271-only.)
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Re: Last Gasp for the 8271

Post by AndyF » Wed Apr 17, 2019 8:04 am

Are not most software titles compatible with the 177x series of controller ?

They seem to function just fine with the 5.25 floppies. At least for me although I don't own a working 5.25 drive anymore, then again I only have a couple of discs in that size and have images of them.

I think perhaps the reasoning for wanting the 8271 is the few 'original' disc images which had protection whereby it would attempt to control the controller directly perhaps ? This would obviously cause issues with the 177x , from memory the original Hobbit disc (if you can find a working one!) has this.

As an aside does the CTRL+Z (I think its Z, I forget now) with the 177x not improve matters a fraction ?

EDIT... Missed the part about other systems requirements for the 8271, sorry! :oops: That indeed does make sense now as trying to force/cobble in a 177x would be a lot of trouble no doubt.
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Re: Last Gasp for the 8271

Post by trixster » Wed Apr 17, 2019 8:16 am

I would be similarly interested in a kit to have as a spare.
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Re: Last Gasp for the 8271

Post by Prime » Wed Apr 17, 2019 8:20 am

Yeah I'd be interested in 2-3 8271s, just as spares for Atom / System.

Though for the Atom I did produce a 177x disk interface, so the code for that exists and is as far as I can tell compatible with all the software I've seen as there didn't seem to be much Atom / System software that made direct access to the FDC, mostly used calls through the OS.

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Re: Last Gasp for the 8271

Post by anightin » Wed Apr 17, 2019 9:44 am

I would be interested in a spare too. Many thanks for asking.

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Re: Last Gasp for the 8271

Post by rharper » Wed Apr 17, 2019 9:55 am

I would be interested in an upgrade kit.
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Re: Last Gasp for the 8271

Post by RonBate » Sat Apr 20, 2019 6:01 am

I am interested in an 8271 upgrade kit. Thanks.

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Re: Last Gasp for the 8271

Post by BeebMaster » Tue Sep 03, 2019 9:35 am

Finally I have a batch of 8271 on the way...should be here next week and then I'll be testing them.

If all goes well I will offer them individually to start with (£12 each inc UK P&P to forum members, £15 elsewhere) and do some full disc interface kits at a later date.
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Re: Last Gasp for the 8271

Post by KenLowe » Tue Sep 03, 2019 1:36 pm

Definitely interested in a couple of those. Full kits preferably, but I'll take the 8271 on it's own if that's all your offering initially, as I'm sure I'll be able to track down the other components.

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Re: Last Gasp for the 8271

Post by lurkio » Tue Sep 03, 2019 1:40 pm

BeebMaster wrote:
Tue Sep 03, 2019 9:35 am
If all goes well I will offer them individually to start with (£12 each inc UK P&P to forum members
Could I put my name down for one of these, please?

:?:

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Re: Last Gasp for the 8271

Post by Lardo Boffin » Tue Sep 03, 2019 1:52 pm

I could do with a disc interface kit for a tape only beeb. Any idea how much? Thanks!
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Re: Last Gasp for the 8271

Post by Diminished » Tue Sep 03, 2019 2:23 pm

I would like one or two if possible.

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Re: Last Gasp for the 8271

Post by Kazzie » Tue Sep 03, 2019 4:09 pm

I'll reiterate my desire for one 8271, please.
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Re: Last Gasp for the 8271

Post by marcusjambler » Tue Sep 03, 2019 5:18 pm

One for me please

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Re: Last Gasp for the 8271

Post by BeebMaster » Sat Sep 07, 2019 11:18 pm

They're here and looking good. All ceramic parts, which is what I was hoping for given the part number on the order. A lot nicer than the plastic ones.
D8271-2.jpg
D8271-7.jpg
Mostly date coded 1980, and some from 1984 and 1985. Hard to tell whether they are new-old-stock or not, there are a few scuff marks but the pins are good. Most importantly, they work!

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D8271-5.jpg
Unfortunately it died overnight which I diagnosed as the user VIA which conked out after only 35 years, and luckily I found a spare Rockwell one with nearly the same date code for maximum authenticity, so the testing continues.

I will do some full kits in a while, I am still looking into it pricing for the over components. The prices have gone up astronomically since the last batch in 2014, and even since May when I last looked.

For now there should be plenty of 8271s for everyone who expressed interest already, so please PM me for ordering.
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Re: Last Gasp for the 8271

Post by tom_seddon » Sun Sep 08, 2019 12:07 am

Any ideas on a ballpark price for the full upgrade kit? I might be a bit price sensitive, as I've already got an Opus Challenger for my (otherwise tape only) B, so I've got disc access covered.

I would quite like an 8271 though... it would come in handy for testing when/if I finally get round to adding 8271 support to my emulator.

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Re: Last Gasp for the 8271

Post by RonBate » Sun Sep 08, 2019 5:34 pm

Earlier I asked for an upgrade kit but will take an 8271 now please and maybe pick up the rest of the kit later if possible - thanks.

Sorry don't think I can PM yet unless a moderator can enable it for me.

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Re: Last Gasp for the 8271

Post by Kazzie » Sun Sep 08, 2019 5:47 pm

RonBate wrote:
Sun Sep 08, 2019 5:34 pm
Earlier I asked for an upgrade kit but will take an 8271 now please and maybe pick up the rest of the kit later if possible - thanks.

Sorry don't think I can PM yet unless a moderator can enable it for me.

Ron
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Re: Last Gasp for the 8271

Post by BeebMaster » Tue Sep 10, 2019 12:09 pm

I've replied to everyone who has messaged me so far. Thanks to everyone who has ordered already.

I am going to hold the price for forum members of the full 8271 disc interface kit at its last (2014) outing - £30. I expect to place an order for the remaining parts by the end of next week but they are on 6 week lead times mostly, so realistically say early November for bits to be arriving and maybe end of November for some kits to be ready for dispatch.

At that time anybody who has had an 8271 and not been able to find the rest of the parts can have an upgrade to the full kit for the balance price.

Possibly I will also do a disc & Econet combo where I can omit the DNFS ROM & 74LS123 from the disc kit as they are already in the Econet kit.
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