Search found 52 matches

by NJ_
Mon Jan 10, 2022 1:08 pm
Forum: for sale / freebies
Topic: Storage boxes for Model A/B/B+/B+128
Replies: 0
Views: 157

Storage boxes for Model A/B/B+/B+128

I'm going to have some bespoke cardboard boxes made so that I can store my collection of computers neatly and space-efficiently. They won't be cheap but I thought I would ask whether anyone else wants any so I can add them my order. I'm trying to keep things simple (for me) so you would have be be w...
by NJ_
Fri Dec 03, 2021 9:40 am
Forum: 8-bit acorn hardware
Topic: Issue 1 questions
Replies: 14
Views: 729

Re: Issue 1 questions

The board may not even be in the original case, it's the smoother type of case so it could be that the serial number was always "wrong" for the board. If it's Station 129 on your website, then it's definitely an Issue 2 board in the wrong case. The PSU is BSR-branded so that's from 1984 o...
by NJ_
Fri Dec 03, 2021 9:38 am
Forum: 8-bit acorn hardware
Topic: Forty years ago...
Replies: 216
Views: 11479

Re: Forty years ago...

Fortunately they have printed large photos of the inside of the machine so we can see what they got: these are Issue 1 production PCBs (with Cleartone serial numbers), there's more than one (PCW had serial 100010, Your Computer had 100004), Basic ROMs hadn't arrived yet (you can just see in the pho...
by NJ_
Fri Dec 03, 2021 9:35 am
Forum: 8-bit acorn hardware
Topic: Forty years ago...
Replies: 216
Views: 11479

Re: Forty years ago...

Just retracing a bit, to the History page of the Computer Literacy Project site, I see a photo which is described as "The launch of the BBC Micro. From L-R: Hermann Hauser (Acorn Computers), John Radcliffe (CLP executive producer), Chris Curry (Acorn Computers), David Allen (CLP editor and ser...
by NJ_
Thu Dec 02, 2021 9:16 am
Forum: general
Topic: History Q: Acorn's injection moulds for Beeb cases
Replies: 13
Views: 695

Re: History Q: Acorn's injection moulds for Beeb cases

There is another varation: the export case. The most visible difference is a recess for a decal on the underside of the lower section, adjacent to the interface sockets. This case was used by Wong Electronics for US and German market Model Bs and also some of their UK-market Issue 7s. There are at l...
by NJ_
Thu Dec 02, 2021 9:14 am
Forum: general
Topic: New website
Replies: 12
Views: 673

Re: New website

Love the site, I may be missing out, but it seems to imply that the Acorn System and Acorn Atoms weren't 8 bit Acorns - probably my reading. I focused only on the BBC Microcomputer-branded 8-bit machines because those are the ones I have direct experience of. So that excludes the System computers a...
by NJ_
Thu Dec 02, 2021 9:13 am
Forum: general
Topic: New website
Replies: 12
Views: 673

Re: New website

I'd be interested to know if there's any further logic to the product codes, for example what does the N stand for in "ANB", and why is a Master "AMB" and not "AMA"? I don't know what the reasoning behind the product codes is, particularly those used for the Master var...
by NJ_
Thu Dec 02, 2021 9:12 am
Forum: general
Topic: New website
Replies: 12
Views: 673

Re: New website

BigEd wrote:
Tue Nov 30, 2021 7:26 pm
Some nice visualisations there - well done!
Thank you - they are all drawn by my own custom code, straight from the database, so if there are any updates to the data (e.g. because I find more details about production volumes for a particular manufacturer), the graphs will update automatically.
by NJ_
Tue Nov 30, 2021 6:12 pm
Forum: 8-bit acorn hardware
Topic: Issue 1 questions
Replies: 14
Views: 729

Re: Issue 1 questions

Sadly my issue 2 Beeb has no serial number. I don't remember whether it had one when it arrived, they do come off sometimes and I have a small bag of loose serial number tickets but I usually stick them back on nowadays instead of keeping them separate. The ICL stickers seem to be quite resilient, ...
by NJ_
Tue Nov 30, 2021 5:54 pm
Forum: general
Topic: New website
Replies: 12
Views: 673

New website

I've been working on a new website about the BBC Micro and I've put the first few pages up today. The initial focus is on how many BBC Micros were made, by whom and when. The information has been compiled over a period of about 2 years (with some last-minute changes this morning based on this thread...
by NJ_
Tue Nov 30, 2021 5:44 pm
Forum: 8-bit acorn hardware
Topic: Issue 1 questions
Replies: 14
Views: 729

Re: Issue 1 questions

It would also be nice to find more evidence to show that ICL didn't build any (eg lower serial Iss2 ICL boards), though my memory of ICL starting later seems to match it (NB. I've just fixed the link to ICL serial 131 in my post above). Also found this ICL Issue 3 at only serial 1013 , so they evid...
by NJ_
Tue Nov 30, 2021 5:40 pm
Forum: 8-bit acorn hardware
Topic: Issue 1 questions
Replies: 14
Views: 729

Re: Issue 1 questions

This one? https://stardot.org.uk/forums/viewtopic.php?p=245451#p245451 Yes, that's the one! Do we know of any earlier issue 2 serial numbers? Yes, 100296 is the lowest so far. There's no mention of Cleartone on the label but arg is emphatic about it being a Cleartone number. That's where my estimat...
by NJ_
Tue Nov 30, 2021 5:38 pm
Forum: 8-bit acorn hardware
Topic: Issue 1 questions
Replies: 14
Views: 729

Re: Issue 1 questions

Thank you for such a comprehensive and interesting response. I've been reading Richard Russell's documents with interest but I had not seen the article about ICL's PCB manufacturing. Quite possibly the un-built Iss1 were put aside to "do later when we've labour to spare for rework", then t...
by NJ_
Thu Nov 25, 2021 10:24 am
Forum: 8-bit acorn hardware
Topic: Issue 1 questions
Replies: 14
Views: 729

Issue 1 questions

I've been trying to work out how many Issue 1 machines were made - and by which companies. The introduction to the April 1982 issue of the service manual states that 1,000 issue 1 circuit boards were produced. I am doubtful that all of those PCBs were ever populated with components, let alone built ...
by NJ_
Wed Nov 24, 2021 12:41 pm
Forum: 8-bit acorn hardware
Topic: Poorly BBC B
Replies: 10
Views: 764

Re: Poorly BBC B

The S25 link: the attached photos show what happened when the machine was switched on after that link had been moved around. The red and green blocks only appear when the link is either off or south. Subsequently typing MODE 0 doesn't alter the initial display unless the link is north, when the res...
by NJ_
Wed Nov 24, 2021 12:37 pm
Forum: for sale / freebies
Topic: GONE: Old PC Software
Replies: 7
Views: 441

Re: FREE: Old PC Software

philpem wrote:
Sat Nov 20, 2021 2:35 am
May I pop my name down as interested in Goldstein's C Library, please?
Phil, I sent you a PM a few days ago, please let me know whether you still want this.
by NJ_
Tue Nov 23, 2021 3:06 pm
Forum: for sale / freebies
Topic: GONE: 30 Hour Basic and Basic Programming on the BBC Microcomputer
Replies: 10
Views: 534

Re: FREE books: 30 Hour Basic and Basic Programming on the BBC Microcomputer

That's very kind of you John. James, I'll send you a PM.
by NJ_
Tue Nov 23, 2021 2:35 pm
Forum: for sale / freebies
Topic: GONE: 30 Hour Basic and Basic Programming on the BBC Microcomputer
Replies: 10
Views: 534

Re: FREE books: 30 Hour Basic and Basic Programming on the BBC Microcomputer

PM sent to John yesterday morning but I have yet to hear back from him. John - please let me know if you still want them. James - what an excellent idea to use BBC BASIC running on a proper 8-bit machine to teach your son to program. Even today it's still a great place to start and the fundamentals ...
by NJ_
Tue Nov 23, 2021 8:40 am
Forum: 8-bit acorn hardware
Topic: Any machine ever have combined raster and vector video system?EDITAn impossiblity I think?
Replies: 25
Views: 2814

Re: Any machine ever have combined raster and vector video system?EDITAn impossiblity I think?

They do normally , but in principle you can change the contents of the memory from field to field and thus achieve the same vertical resolution as you get in MODE 7. With only a 2 MHz 6502 I expect the maximum number of pixels you can manage to change (even if 'chasing' the raster scan and doing no...
by NJ_
Mon Nov 22, 2021 9:48 am
Forum: for sale / freebies
Topic: GONE: ViewSheet complete and boxed
Replies: 0
Views: 176

GONE: ViewSheet complete and boxed

If there's anyone there who's particularly interested in boxed Acorn products in general or the View productc in particular, this might be a nice addition to your collection. It's ViewSheet - boxed and, as far as I can tell, complete, including all the original documentation. It came with an Issue 3...
by NJ_
Mon Nov 22, 2021 9:24 am
Forum: for sale / freebies
Topic: GONE: Acornsoft BBC Micro games on cassette
Replies: 3
Views: 280

Re: GONE: Acornsoft BBC Micro games on cassette

Now on their way to gavinlew!
by NJ_
Sat Nov 20, 2021 4:53 pm
Forum: for sale / freebies
Topic: GONE: Acornsoft BBC Micro games on cassette
Replies: 3
Views: 280

GONE: Acornsoft BBC Micro games on cassette

Three well-known and fairly easy to find games but someone may want them! Countdown to Doom, Sphinx Adventure and Aviator, all on cassette. Countdown to Doom has an unopened hints envelope. Sphinx adventure comes with a hand-drawn map made by the previous owner and Aviator has nothing other than the...
by NJ_
Sat Nov 20, 2021 4:38 pm
Forum: for sale / freebies
Topic: GONE: 30 Hour Basic and Basic Programming on the BBC Microcomputer
Replies: 10
Views: 534

GONE: 30 Hour Basic and Basic Programming on the BBC Microcomputer

30 Hour Basic and Basic Programming on the BBC Microcomputer - two classic and popular books which most of you probably already have! However if there's anyone who would like them, please get in touch. There are a few annotations written in pencil in the 30 Hour Basic book and the name of the previo...
by NJ_
Sat Nov 20, 2021 8:05 am
Forum: for sale / freebies
Topic: GONE: Old PC Software
Replies: 7
Views: 441

Re: FREE: Old PC Software

Thank you everyone - it’s great that there are takers for three out of four already so I’ll send you all PMs with postage costs.
by NJ_
Fri Nov 19, 2021 12:56 pm
Forum: for sale / freebies
Topic: GONE: Old PC Software
Replies: 7
Views: 441

GONE: Old PC Software

I know this isn't Acorn stuff but I'm trying not to throw it away, so I hope it's OK to offer here (it did come with a BBC micro I bought recently, if that helps). Four boxed pieces of software for DOS PCs, some on 5.25" floppy discs and the others on 3.5" floppies. All are complete, boxed...
by NJ_
Thu Nov 11, 2021 10:10 am
Forum: 8-bit acorn hardware
Topic: Ooops
Replies: 8
Views: 715

Re: Ooops

I suppose the linear supplies dont have RIFA's ? Which variation of the linear PSU is fitted? The two most common model numbers are VT 25514 and D 1597. Judging by the photo on eBay, it looks like the latter but the label is missing from the back panel so it's hard to tell. There are no Rifa capaci...
by NJ_
Tue Nov 09, 2021 8:11 am
Forum: 8-bit acorn hardware
Topic: Ooops
Replies: 8
Views: 715

Re: Ooops

Not here yet, but will post pics when I get it :) I guess it’s this one: https://www.ebay.co.uk/itm/Acorn-BBC-microcomputer-unsure-whether-model-A-or-B-untested-/275009214742 It would be interesting to see pictures of the PCB and PSU when it arrives. If you’re lucky it will still have OS 0.1 on fou...
by NJ_
Thu Nov 04, 2021 10:24 am
Forum: 8-bit acorn hardware
Topic: Restoring an early BBC Micro
Replies: 39
Views: 1731

Re: Restoring an early BBC Micro

The board was definitely born as a model A. This is proven by the fact that all the connectors have been hand soldered in afterwards (look at all the flux!) and the 2nd lot of ram is socketed. Socketed RAM is not an indicator that the machine was originally a Model A unless it's an Issue 7 board. W...
by NJ_
Thu Nov 04, 2021 10:19 am
Forum: 8-bit acorn hardware
Topic: Restoring an early BBC Micro
Replies: 39
Views: 1731

Re: Restoring an early BBC Micro

Both the BNC and the composite lead were connected to crimps on the board, crimps were stuck by the solder so that was probably done when the composite lead was connected. It could be that the original cable was lost or something so the lead was added. Easy enough to fix at least. The crimp connect...

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