Search found 2175 matches

by BigEd
Sun Dec 09, 2018 6:31 pm
Forum: acorn atom and system
Topic: An unknown Acorn Atom Clone found?
Replies: 14
Views: 1487

Re: An unknown Acorn Atom Clone found?

Is this a unique and novel version of BASIC? I notice it has a JPERR command, for example, not sure I've seen that before. Edit: I see there's an early mention in the press in 1981 where the machine is expected to be launched in Jan '82 at 600 thousand lira. See p14 of issue 3 of MCmicrocomputer: ht...
by BigEd
Sat Dec 08, 2018 4:08 pm
Forum: general
Topic: Acorn's 40th birthday / CPU Ltd
Replies: 6
Views: 222

Re: Acorn's 40th birthday / CPU Ltd

A bit more. Steve Furber said : Sophie designed this two-board system and Chris and Herman decided they would market it from CPU Ltd but they would market it under the trade name Acorn. So Acorn was introduced first as a trade name of CPU Ltd, of course later it became the official company name. Whe...
by BigEd
Sat Dec 08, 2018 3:39 pm
Forum: general
Topic: Acorn's 40th birthday / CPU Ltd
Replies: 6
Views: 222

Re: Acorn's 40th birthday / CPU Ltd

Ah - I see Hauser himself says he and Chris Curry co-founded CPU Ltd: “Chris and I didn’t suddenly start Acorn, the fountainhead of computer development, with the click of our fingers. Acorn was a soft startup and we began life as a technology consultancy called CPU – Cambridge Processor Unit Ltd. “...
by BigEd
Sat Dec 08, 2018 1:53 pm
Forum: general
Topic: Acorn's 40th birthday / CPU Ltd
Replies: 6
Views: 222

Re: Acorn's 40th birthday / CPU Ltd

What's the most solid source we have for the idea that CPU was a limited company? It seems plausible to me that CPU was an idea, a collaboration, a cooperative, and Acorn Ltd was instigated by someone (Hauser?) who had the background to know the advantages of a limited company. Possibly CPU traded a...
by BigEd
Thu Dec 06, 2018 4:48 pm
Forum: other vintage computer hardware, software and games
Topic: Dragon 32 or Amstrad CPC 464
Replies: 37
Views: 812

Re: Dragon 32 or Amstrad CPC 464

Not only is the 464 rumoured to have a decent keyboard, it can now be fitted with an Acorn-style second processor (in the form of a Raspberry Pi, running PiTubeDirect) thanks to the efforts of revaldinho. See this thread over on the CPCwiki forum. (It's early days for this project - more software is...
by BigEd
Tue Dec 04, 2018 5:24 pm
Forum: emulators
Topic: More interesting 6522 VIA emulation discrepancies
Replies: 28
Views: 501

Re: More interesting 6522 VIA emulation discrepancies

Updated results: Beeb: >RUN 4436 (AD 1 10) 0 DD 4443 (AD 2 10) 0 DD 4450 (AD 3 10) 0 DD 445E (AD 4 10) 0 DD 0 0 0 0 0 0 4488 (AD 7 10) 0 FF 4497 (AD 8 10) 0 0 0 0 0 44B8 (E6 71 8C) C0 FF 44C5 (E6 71 8C) C0 FF 0 0 0 0 0 0 44F6 (AD E 10) C0 DB 4506 (AD F 10) C0 DC 4516 (AD 10 10) C0 FF 4527 (AD 11 10)...
by BigEd
Tue Dec 04, 2018 4:50 pm
Forum: emulators
Topic: More interesting 6522 VIA emulation discrepancies
Replies: 28
Views: 501

Re: More interesting 6522 VIA emulation discrepancies

On a Beeb: >RUN 4436 (AD 1 10) 0 DD 4443 (AD 2 10) 0 DD 4450 (AD 3 10) 0 DD 445E (AD 4 10) 0 DD 0 0 0 0 0 0 4488 (AD 7 10) 0 FF 4497 (AD 8 10) 0 0 0 0 0 44B8 (E6 71 8C) C0 FF 44C5 (E6 71 8C) C0 FF 0 0 0 0 0 0 44F6 (AD E 10) C0 DB 4506 (AD F 10) C0 DC 4516 (AD 10 10) C0 FF 4527 (AD 11 10) C0 0 453A (...
by BigEd
Wed Nov 28, 2018 12:43 pm
Forum: emulators
Topic: Default sn76489 sound chip state
Replies: 13
Views: 262

Re: Default sn76489 sound chip state

If you hold down the break key, I think you might get as long a 'boo' as you want, for purposes of recording and analysis. But I think I've heard that different machines have a different 'boo'.
by BigEd
Tue Nov 27, 2018 10:11 am
Forum: hardware
Topic: PiTubeDirect on an Electron
Replies: 6
Views: 211

Re: PiTubeDirect on an Electron

Can you expect a general performance increase? Is there any existing software available for a second processor? Basic will run faster! And anything written in Basic. Anything which accesses hardware directly - which is most games - won't be able to use the second processor. Only software which uses...
by BigEd
Fri Nov 23, 2018 6:47 pm
Forum: programming
Topic: Shuffling a pack of cards
Replies: 17
Views: 510

Re: Shuffling a pack of cards

Hmm, does that fall under Implementation Errors? (I can't quite tell - requires too much brain power!)
by BigEd
Fri Nov 23, 2018 2:12 pm
Forum: general
Topic: Beeb Spotting
Replies: 40
Views: 3897

Re: Beeb Spotting

In Stephen Hawking's office, from a 2008 documentary on his life and research.
Hawking-Beeb.png
Hawking-Beeb.png (117.82 KiB) Viewed 161 times
by BigEd
Thu Nov 22, 2018 9:08 am
Forum: hardware
Topic: Puzzling graphics glitch on my Beeb
Replies: 27
Views: 558

Re: Puzzling graphics glitch on my Beeb

If the problem is heat-sensitive, you might be able to isolate the offending component by experimenting with some cooling spray.
by BigEd
Wed Nov 21, 2018 8:25 pm
Forum: bbcmicro.co.uk
Topic: Game information - help required
Replies: 23
Views: 812

Re: Game information - help required

You can feed such URLs to archive.is if you want them saved. (Or archive.org, probably.)
by BigEd
Wed Nov 21, 2018 2:52 pm
Forum: other vintage computer hardware, software and games
Topic: What brand/type of FPGA
Replies: 6
Views: 161

Re: What brand/type of FPGA

For sure you could connect up an SRAM - and almost certainly could find one to work at 3.3V. I/O is slightly more tricky: first port of call for me has usually been a serial port. VGA out isn't too difficult once you've got a suitable adapter board. Keyboards are a little more involved than serial, ...
by BigEd
Wed Nov 21, 2018 2:37 pm
Forum: hardware
Topic: Puzzling graphics glitch on my Beeb
Replies: 27
Views: 558

Re: Puzzling graphics glitch on my Beeb

Measuring the supply voltage at the Video ULA's pins would be good. If you had a scope you could also check for noise on that supply.
by BigEd
Wed Nov 21, 2018 12:16 pm
Forum: other vintage computer hardware, software and games
Topic: What brand/type of FPGA
Replies: 6
Views: 161

Re: What brand/type of FPGA

Might well be fine! This one has a recognisable brand (ALINX) but you'll always be taking a bit of a punt - usual ebay rules apply! I see all three are from the same seller . It's worth noting that for many dev boards you will need some kind of programming dongle/adaptor. So that adds to the price, ...
by BigEd
Wed Nov 21, 2018 11:41 am
Forum: other vintage computer hardware, software and games
Topic: What brand/type of FPGA
Replies: 6
Views: 161

Re: What brand/type of FPGA

Much depends on your budget! There's a several-page topic over here which might help. Broadly, any manufacturer will do - they all offer free tools, which are sometimes a massive download and sometimes not excellent quality, but they work. I've found myself mostly using Xilinx, in the older flavours...
by BigEd
Wed Nov 21, 2018 10:43 am
Forum: hardware
Topic: Puzzling graphics glitch on my Beeb
Replies: 27
Views: 558

Re: Puzzling graphics glitch on my Beeb

Funnily enough I'd remembered that trimming pot when we were looking at my Beeb, but it turns out the Beeb PSU is trimmed by means of some optional resistors inside, and we weren't up to opening up the PSU. I think the machine was seeing about 4.75V. (Edit: see below, hoglet recalls, more accurately...
by BigEd
Wed Nov 21, 2018 10:10 am
Forum: hardware
Topic: Puzzling graphics glitch on my Beeb
Replies: 27
Views: 558

Re: Puzzling graphics glitch on my Beeb

Oh, I had something a bit like that on my Beeb which Dave hoglet investigated: the PSU was a bit low-voltage, the middle power supply injection point was a bit sensitive to prodding, and then it turned out that the Video ULA was making a bad connection in the socket. Putting a turned-pin socket into...
by BigEd
Tue Nov 20, 2018 5:59 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD
Replies: 44
Views: 1441

Re: ABUG SOUTH 18 to 20 January 2019 (Hampshire) BOOKING THREAD

I'm guessing the default is a half-table, and people with serious amounts of kit will want a full table?
by BigEd
Tue Nov 20, 2018 4:40 pm
Forum: other vintage computer hardware, software and games
Topic: Vintage Collections
Replies: 37
Views: 872

Re: Vintage Collections

I think you win the National Semiconductor most valuable player award Boydie!

But do you also have an IEEE488 cheesewedge?
by BigEd
Tue Nov 20, 2018 8:49 am
Forum: general
Topic: British Micro Federation
Replies: 35
Views: 753

Re: British Micro Federation

You might want to post that into the off-topic forum instead.
by BigEd
Mon Nov 19, 2018 8:08 pm
Forum: other vintage computer hardware, software and games
Topic: Vintage Collections
Replies: 37
Views: 872

Re: Vintage Collections

Wow! Some amazingly unusual machine there. And yet... no 8080 machine? Or is it there but I didn't spot it?
by BigEd
Mon Nov 19, 2018 11:34 am
Forum: adventures
Topic: [Solved] Identification of an old game, map attached
Replies: 13
Views: 304

Re: [Solved] Identification of an old game, map attached

Yes, attaching an image as a file is a good way to do it! So often we find that image-hosting companies give up, and old threads have interesting stories to tell but scads of missing images.
by BigEd
Mon Nov 19, 2018 9:11 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 595
Views: 21136

Re: RGB to HDMI using a Pi Zero and a small CPLD

Just a tiny thought Dave: to avoid the problem of the vsync bar potentially being off screen, could you add in a second bar which is, I don't know, 150 lines later? Then one or other of them would always be visible.
by BigEd
Mon Nov 19, 2018 9:07 am
Forum: general
Topic: British Micro Federation
Replies: 35
Views: 753

Re: British Micro Federation

Yep, the browser and the fast JavaScript engines have shifted the playing field. Indeed, JS is also used server-side, and the subset of JS called WebAssembly allows for the running of programs written in some 20 high level languages, including C/C++, Java, Python, rust, go,... While one might like t...
by BigEd
Sun Nov 18, 2018 6:20 pm
Forum: general
Topic: British Micro Federation
Replies: 35
Views: 753

Re: British Micro Federation

I think you can still - just about - buy an ARM-based Chromebook from the high street.
(John Lewis have two models.)
by BigEd
Sun Nov 18, 2018 3:50 pm
Forum: other vintage computer hardware, software and games
Topic: Vintage Collections
Replies: 37
Views: 872

Re: Vintage Collections

aah - a wish list - that could be very revealing! I'd very much like a Curta "pepper-grinder" mechanical calculator, and I'd quite like an early HP programmable. I have - hopefully - got a Spectrum Next with my name on it which might arrive this side of Easter. Already paid for, and a bit of an indu...
by BigEd
Sun Nov 18, 2018 8:48 am
Forum: general
Topic: British Micro Federation
Replies: 35
Views: 753

Re: British Micro Federation

I think there's a cultural difference too. Anyone in the UK setting up a software company is most likely to be happy to stay in business. World domination isn't usually on the agenda. The likes of Sugar and Branson are notable because they are so rare. That said, the UK did throw up one or two very ...