Issue 1 BBC, how to tell ?

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robert24
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Issue 1 BBC, how to tell ?

Postby robert24 » Sat Nov 04, 2017 8:13 pm

Hi guys... many years ago I bought a BBC B 32K that was described as Issue one. I'm, finally coming around to selling some of my beebs and am wondering how I should describe it.

The board itself says Issue 3. The power leads from the PSU are soldered to the PCB. Ram chips soldered too.
It has OS1.20 on eprom, and has Basic 1 (c) 1981.
It doesn't seem to have an acorn serial number, rather a sticker from AB Electronics

At the time (10 years ago) we were collecting Beebs and probably paid over the top (over £100 as we remember)

So looking for some wisdom... if it is issue 1, shouldn't the PCB say Issue 1 ?

Is it just a poorly assembled issue 3 ?

Over...

EDIT: Just opened her up and the RAM chips are socketed. Maybe we'll take a picture.
IMG_0198.JPG
Issue 3 (QED ?)

IMG_0200.JPG
Eprom OS and socketed RAM
Last edited by robert24 on Sat Nov 04, 2017 8:35 pm, edited 1 time in total.
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Thanks for a great Beeb resource :-)

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danielj
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Re: Issue 1 BBC, how to tell ?

Postby danielj » Sat Nov 04, 2017 8:21 pm

It will say "issue 1" on the board if it's an issue 1. That's an issue 3. Early beebs had 1) a linear power supply, BASIC 1, and OS 0.1 (which was on 4 eproms instead of a single ROM). There were a variety of different manufacturers of the beeb, AB were one of them.

d.

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robert24
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Re: Issue 1 BBC, how to tell ?

Postby robert24 » Sat Nov 04, 2017 8:36 pm

OK Thanks. Seems pretty obvious really :-))
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Thanks for a great Beeb resource :-)

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tricky
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Re: Issue 1 BBC, how to tell ?

Postby tricky » Sat Nov 04, 2017 8:37 pm

I only know of two issue 2 Beebs in the wild and no issue 1s. The first widely available beeb was issue 3. The "linear" PSU is usually black with a circle in the middle.
http://stardot.org.uk/forums/viewtopic.php?f=42&t=10849&p=134414&hilit=linear#p134558

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paulv
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Re: Issue 1 BBC, how to tell ?

Postby paulv » Sat Nov 04, 2017 10:27 pm

Issue 1 usually refers to the BBC B+ Issue 1 motherboard.

I believe the first production release of the BBC B was the Issue 2 board....

Paul

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danielj
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Re: Issue 1 BBC, how to tell ?

Postby danielj » Sat Nov 04, 2017 10:28 pm


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paulv
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Re: Issue 1 BBC, how to tell ?

Postby paulv » Sat Nov 04, 2017 10:36 pm

tricky wrote:I only know of two issue 2 Beebs in the wild and no issue 1s. The first widely available beeb was issue 3. The "linear" PSU is usually black with a circle in the middle.
http://stardot.org.uk/forums/viewtopic.php?f=42&t=10849&p=134414&hilit=linear#p134558


I have an Issue 2 Beeb. Are you counting that as one of the two issue 2's in the wild?

Mine doesn't have the linear PSU and it's obviously been upgraded from a Model A to Model B by someone with less than good soldering skills. The case is severely tanned and I'm leaving it that way.

Paul

Boydie
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Re: Issue 1 BBC, how to tell ?

Postby Boydie » Sat Nov 04, 2017 10:50 pm

Someone at uni (rme, for the benefit of crj) claimed to have an actual proton, fished out of a skip at Acorn. Allegedly, it was several separate boards (system-style eurocards?), hard-wired together. Whether this counts as an issue 1, I don’t know.
He may even have been making it up. Then again, Acorn did have a habit of just throwing stuff away. In the early 90s, we sold a couple of atom econet boards back to Acorn because they’d got rid of all theirs and Bruce Cockburn wanted some.

philb
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Re: Issue 1 BBC, how to tell ?

Postby philb » Sat Nov 04, 2017 10:51 pm

paulv wrote:I believe the first production release of the BBC B was the Issue 2 board....


Acorn used to have a convention that prototype boards had letters (Issue A etc) with Issue 1 always being the first production version, and I'm reasonably sure this was the case when the Beeb was first launched. But I think it's also true that not many issue 1 boards were ever built and I doubt many of them survive today. I think the only issue 1 boards I've ever seen are ones that belonged to Acorn staffers from that period.

crj
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Re: Issue 1 BBC, how to tell ?

Postby crj » Sun Nov 05, 2017 4:17 am

Boydie wrote:Someone at uni (rme, for the benefit of crj) claimed to have an actual proton, fished out of a skip at Acorn.

I'm not certain it's well defined what "a Proton" ever was. You could take a System 5 and gradually replace cards with more BBC-Micro-like prototypes, never being quite sure when you'd made the transition. I thought the Proton was still somewhat card-based when it was demonstrated to the BBC.

I wonder what happened to that demonstration model, though? I guess it was probably back on the lab bench being hacked around the same afternoon rather than being preserved as a priceless artefact. Alas.

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tricky
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Re: Issue 1 BBC, how to tell ?

Postby tricky » Sun Nov 05, 2017 8:17 am

paulv wrote:...I have an Issue 2 Beeb. Are you counting that as one of the two issue 2's...

That does ring a bell, my issue 2 is well into the fake tan category, but looks like an original model B.

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danielj
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Re: Issue 1 BBC, how to tell ?

Postby danielj » Sun Nov 05, 2017 8:55 am

Indeed. The proton as demonstrated to the BBC was a wire-wrapped card based thing AFAIK. Steve Furber gave something which could be described as a BBC Micro pre-cursor (sort of system/beeb-hybrid) to the Centre for Computing History this year. It's on youtube somewhere.

d.

steve3000
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Re: Issue 1 BBC, how to tell ?

Postby steve3000 » Sun Nov 05, 2017 9:39 am

tricky wrote:
paulv wrote:...I have an Issue 2 Beeb. Are you counting that as one of the two issue 2's...

That does ring a bell, my issue 2 is well into the fake tan category, but looks like an original model B.

I know of two more issue 2's still in use, so a fair few must have made it out into the wild at the time.

Love Paul's picture though, it makes the beeb look like a very elegant keyboard for his A410 :)


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