Worth Taking a Look At

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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Sat Mar 17, 2018 3:22 am

1024MAK wrote:Nope, it went over my bid...

Reviewing the pictures and the problems listed by the seller, I can say that it has a SMPSU.

Mark

SMPSU?
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

crj
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Re: Worth Taking a Look At

Post by crj » Sat Mar 17, 2018 3:31 am

Switched-Mode Power Supply Unit. The normal kind you see in most Beebs. Very early machines originally had a linear power supply.

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Re: Worth Taking a Look At

Post by steve3000 » Sat Mar 17, 2018 8:12 am

1024MAK wrote:Reviewing the pictures and the problems listed by the seller, I can say that it has a SMPSU.
Also has a punched out perforated ashtray hole - the perforated ashtray appeared around the time that SMPSUs began being fitted at manufacture, mid way during issue 3 run I believe. Before that there were no perforations, and you'd had to have sliced the ashtray hole out, which would have been messy...

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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Sat Mar 17, 2018 8:24 am

Is there a collected guide of what to look out for on the very early issue beebs anywhere?

So far I can see:-

Large gap at the back
Linear PSU (presumably no magic smoke)
No perforated ash tray
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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1024MAK
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Re: Worth Taking a Look At

Post by 1024MAK » Sat Mar 17, 2018 11:47 am

The first Beebs used a conventional PSU with a 50Hz mains transformer and a series voltage regulator system (often called a 'linear' power supply, but as this term is often misused and a poor description of how they work, I dislike the term). These can be identified by having no aux power connector. Later on, Acorn switched to using switch-mode power supply units (SMPSU). These provide a 12V supply for disk drives as well as the main +5V and the -5V. They have an aux power connector for disk drives to be plugged into. On the rear panel of the PSU/Beeb it will show a rating of 50W. SMPSU were also available to existing users if they wanted to upgrade to a disk drive system.

Mark

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Re: Worth Taking a Look At

Post by crj » Sat Mar 17, 2018 4:16 pm

So far as I'm aware, every linear PSU was black, and every switched-mode one was silver, as a further identification hint?

Does anybody have a photo of what was supposed to go in the "ashtray"? I have a very vague recollection of once, just once, in the early eighties seeing a Beeb which had a yellow/cream/white receptacle there with a semicircular bottom and two lines of contacts approximately above where the PCB holes for the speech cartridge system lie. But I may have dreamed it, or it may have been a very early and strange after-market modification.

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1024MAK
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Re: Worth Taking a Look At

Post by 1024MAK » Sat Mar 17, 2018 6:03 pm

The rear panel of the SMPSUs is black...

I can't tell you about the finishing or trim of the ashtray, but the electrical connections were supposed to be edge-connectors for the (never released) speach cartridges.

Mark

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geraldholdsworth
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Re: Worth Taking a Look At

Post by geraldholdsworth » Sun Mar 18, 2018 7:22 pm

There's a few bits and bobs (mostly Acorn flyers) going over on the Acorn Computer and BBC Micro Enthusiasts Facebook group. There is also a working A7000+ motherboard - only thing about it is that there is no ROM and the IDE section is shot.
If this stuff isn't spoken for, it'll head to the skip.
(I'm not the one getting shot of it, by the way).
https://www.facebook.com/groups/AcornAn ... &ref=notif
Gerald Holdsworth
Repton Resource Page
www.reptonresourcepage.co.uk

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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Sun Mar 25, 2018 10:34 am

BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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ask_nz
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Re: Worth Taking a Look At

Post by ask_nz » Wed Mar 28, 2018 6:28 am

Lardo Boffin wrote:Is there a collected guide of what to look out for on the very early issue beebs anywhere?

So far I can see:-

Large gap at the back
Linear PSU (presumably no magic smoke)
No perforated ash tray
Note sure if this is exactly what your looking for but my observations of early model is...
The case molding on early Beebs are different from later ones - earlier are much deeper texture
The early upper case has a different clear strip which is not compatible with later strips (slightly wider or visa versa). The Early strip is the BBC Computer Strip.
The early Keyboard (later than issue 1) doesn't have screw holes for the later black speaker mount - the speaker is stuck the keyboard with double sided tape
The early lower case doesn't have guide lugs for aligning the keyboard.
The Issue 1 keyboard in colour photos (magazine images) looks like its completely inverted with the circuit on the upper side - but this could just be poor printing.

Hope this helps.

Ade
Ade

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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Sun Apr 01, 2018 3:37 pm

Thanks Ade. Anyone have photos of one?


Interesting repair stuff?

https://m.ebay.co.uk/itm/Acorn-Computer ... %7Ciid%3A1
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Sun Apr 01, 2018 8:30 pm

Boxed B+ 64k for £70. Does a double beep and the leds light up (unfortunately - apparently!).

https://m.ebay.co.uk/itm/Vintage-BBC-Mi ... 5232.l9681
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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ask_nz
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Re: Worth Taking a Look At

Post by ask_nz » Tue Apr 03, 2018 9:38 am

Lardo Boffin wrote:Thanks Ade. Anyone have photos of one?
Colour magazine scan of issue 1 here..

viewtopic.php?f=42&t=10849#p194250

you can definitely see the circuit traces on the upper side unless the circuit board is semi transparent.

A.
Ade

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ask_nz
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Re: Worth Taking a Look At

Post by ask_nz » Tue Apr 03, 2018 9:40 am

Ade

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danielj
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Re: Worth Taking a Look At

Post by danielj » Tue Apr 03, 2018 10:30 am

Just generally, what are people's feelings about this thread? It's sort of interesting if you're not bidding, but if you are, is it horribly irritating for the thing you're going for to be brought to everyone's attention? Thinking about it, I suspect it'd irk me.

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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Tue Apr 03, 2018 10:46 am

danielj wrote:Just generally, what are people's feelings about this thread? It's sort of interesting if you're not bidding, but if you are, is it horribly irritating for the thing you're going for to be brought to everyone's attention? Thinking about it, I suspect it'd irk me.
That is a good question. I put stuff on here that I see that I think people may be interested in, especially below price buy it now stuff. But if people on here are already bidding on items its not going to help them.
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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danielj
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Re: Worth Taking a Look At

Post by danielj » Tue Apr 03, 2018 10:51 am

Likewise I've done the same, but I can just imagine sitting there with a bid in on a lowish auction, as suddenly everyone's attention is brought to it. :? (you didn't need to delete that post, I was just trying to gauge opinion!)

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Re: Worth Taking a Look At

Post by RobC » Tue Apr 03, 2018 11:24 am

danielj wrote:Just generally, what are people's feelings about this thread? It's sort of interesting if you're not bidding, but if you are, is it horribly irritating for the thing you're going for to be brought to everyone's attention? Thinking about it, I suspect it'd irk me.
I've had this happen to me a small number of times but, to be honest, if someone else is prepared to pay more for something, I think that's fair enough.

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1024MAK
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Re: Worth Taking a Look At

Post by 1024MAK » Tue Apr 03, 2018 1:09 pm

To be honest, eBay is so busy nowadays that even if a low priced item was not posted here, on Facebook, or elsewhere, you are still going to have plenty of competition from other bidders. So I don't think this thread makes any significant difference.

Also, most regular members here already have most of the hardware and software that they want. So it's not like there is a sudden surge of bidders when an item is posted in this thread.

But for people like me, who don't spend hours browsing eBay, it can be interesting to see what members do post up here, and to have a look and sometimes watch the last minute of the auction. Even if I'm not interested in bidding.

Mark

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danielj
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Re: Worth Taking a Look At

Post by danielj » Tue Apr 03, 2018 2:43 pm

I think you're probably right and it probably makes very little difference for the most part. I should emphasise that despite thought experiment, I've no vested interest here! :D

d.

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jonb
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Re: Worth Taking a Look At

Post by jonb » Tue Apr 03, 2018 7:13 pm

I'm with Mark on this one. This thread, plus the "Today I received..", LOLPRICE and LOLDESCRIPTION threads are the ones I look forward to reading!

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flaxcottage
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Re: Worth Taking a Look At

Post by flaxcottage » Tue Apr 17, 2018 8:53 pm

- John
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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Wed Apr 18, 2018 12:43 pm

This should probably go in a ‘burn the heretic’ post:-

https://m.ebay.co.uk/itm/Vintage-BBC-Mi ... %7Ciid%3A1
BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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jonb
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Re: Worth Taking a Look At

Post by jonb » Wed Apr 18, 2018 1:50 pm

I don't think I'd want to lug that into a coffee shop...

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flaxcottage
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Re: Worth Taking a Look At

Post by flaxcottage » Wed Apr 18, 2018 8:14 pm

This should be in the LOL price section! :shock:

Tynemouth Software can do this sort of thing as shown here:- http://blog.tynemouthsoftware.co.uk/201 ... d-kit.html

Still there might be a muffin out there with more money than sense. :roll: :lol:
- John
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Lardo Boffin
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Re: Worth Taking a Look At

Post by Lardo Boffin » Wed Apr 25, 2018 7:53 pm

BBC model B 32k issue 4, 16k sideways RAM, Watford 12 ROM board, Viglen twin 40/80 5.25" discs, Acorn 6502 coproc
BBC model B 32k issue 7, turboMMC, Opus Challenger 3 512k, Pi 3 coproc
BBC Master, Datacentre + HDD, pi co-proc

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Re: Worth Taking a Look At

Post by atcurtis » Fri May 04, 2018 11:26 am

flaxcottage wrote:This should be in the LOL price section! :shock:

Tynemouth Software can do this sort of thing as shown here:- http://blog.tynemouthsoftware.co.uk/201 ... d-kit.html

Still there might be a muffin out there with more money than sense. :roll: :lol:
To achieve the proper retro feel, they should make the USB keyboard exclusively powered through the original Beeb PSU...

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CMcDougall
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Re: Worth Taking a Look At

Post by CMcDougall » Sun May 06, 2018 10:29 pm

https://www.ebay.co.uk/itm/Acorn-BBC-Mi ... 6016.l4276
looks like a Model A, but only has the extra 16k added.... £30+ PP4

he also thinks the Iss3 is more RARE LOLPRICE also selling £40 :lol:

retro_charged [-(
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Re: Worth Taking a Look At

Post by marcusjambler » Tue May 08, 2018 7:49 am


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DutchAcorn
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Re: Worth Taking a Look At

Post by DutchAcorn » Tue May 08, 2018 7:45 pm

marcusjambler wrote:This looks interesting...

https://www.ebay.co.uk/itm/CMS-6502-Com ... Sw6sRa7teu
Very interesting, thanks for sharing.

I wonder how long the listing will stay up with the (understandable) remark that the seller won’t accept PayPal when collecting. Ebay does not like remarks like that.
Paul

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