Search found 185 matches

by Boydie
Fri Apr 20, 2018 7:45 am
Forum: for sale / freebies
Topic: IDE podules - 8 and 16 bit versions
Replies: 15
Views: 177

Re: IDE podules - 8 and 16 bit versions

A3000 version please
Can collect at Wakefield
by Boydie
Mon Apr 09, 2018 12:59 pm
Forum: other vintage computer hardware, software and games
Topic: C64 fault
Replies: 7
Views: 289

C64 fault

I recently obtained a breadbin C64. Initially, it did nothing. Opening it up showed that the large glass fuse had blown. One replacement later, it gives the BASIC header and number of bytes free. However, there’s no cursor and the keyboard’s dead. Swapping the two 6526 CIA chips changed the problem ...
by Boydie
Sun Apr 08, 2018 9:15 pm
Forum: off-topic
Topic: Windows 10 (and 8) and Laptops
Replies: 21
Views: 456

Re: Windows 10 (and 8) and Laptops

And if you opt for an NVME drive on the M.2 interface, the performance is positively obscene. The Samsung 960s come close to saturating 4 channels of PCIe 3.0.
by Boydie
Sat Apr 07, 2018 8:36 am
Forum: off-topic
Topic: Windows 10 (and 8) and Laptops
Replies: 21
Views: 456

Re: Windows 10 (and 8) and Laptops

Part of the problem is that both CPUs are pretty dire, with woeful Passmark scores. The P360 is low-end, but the 4355M is even lower. My old laptop is an 8 year old I5-430M (also HP), so hardly high-end or expensive, even at the time of manufacture. But even that CPU scores higher than those two. Wi...
by Boydie
Tue Mar 20, 2018 9:41 am
Forum: hardware
Topic: Trying to restore an ABC310
Replies: 2
Views: 268

Re: Trying to restore an ABC310

Good suggestion, but I doubt it’d be strong enough.
These things are sheet steel with pretty industrial hinges/clips. Unfortunately, they seem to be less than precision engineered, so take quite a lot of force to open/close and even more force (I worry about using a weak screwdriver) to clip shut.
by Boydie
Sat Mar 17, 2018 8:59 am
Forum: hardware
Topic: Trying to restore an ABC310
Replies: 2
Views: 268

Trying to restore an ABC310

One of my (alleged) Cambridge Workstations came from inside Acorn. During it’s life, it’s had its 32016 board removed, along with the hinged aluminium carrier that the copro board usually sits on. What makes me suspect that it wasn’t originally an ACW is that it also has the Acorn mouse board fitted...
by Boydie
Sat Mar 17, 2018 1:55 am
Forum: hardware
Topic: I've wondered this for thirty years...
Replies: 19
Views: 863

Re: I've wondered this for thirty years...

You may have hit on the reason why it was designed but never launched as a beeb in 1983. The 1985 Beebug review of the 128k upgrade claimed that the connector was never intended for sideways ram. It was originally there to take a different type of main ram should there be supply issues with the usua...
by Boydie
Sat Mar 17, 2018 1:21 am
Forum: hardware
Topic: I've wondered this for thirty years...
Replies: 19
Views: 863

Re: I've wondered this for thirty years...

Agreed. So the bigger question is why it wasn’t rolled out as the Model C in 1983/4, when it would have been a much bigger hit? As it was, the July launch reviews all asked the same question. And when the Master came out the following February, the people who’d bought a B+ were foaming at the mouth....
by Boydie
Fri Mar 16, 2018 11:12 pm
Forum: hardware
Topic: BBC B Micro Power Supply - okay if run unloaded?
Replies: 17
Views: 634

Re: BBC B Micro Power Supply - okay if run unloaded?

Not sure if this counts as sage advice or just an example of luck triumphing over stupidity... Whenever I re-cap a PSU, I always test it off load. The voltages are always what they should be, and nothing bad’s happened. Yet. Maybe the few seconds it takes to test isn’t long enough to make me see the...
by Boydie
Fri Mar 16, 2018 11:07 pm
Forum: hardware
Topic: I've wondered this for thirty years...
Replies: 19
Views: 863

Re: I've wondered this for thirty years...

By the time the B+ came out (only six months before the Master), Acorn will have been well on the way to designing the Master. The prototype Masters were apparently originally called the Model C (I just missed out on one of the Model Cs from an ex-Acorn guy back in the mid-90s but did get lots of fu...
by Boydie
Fri Mar 09, 2018 1:59 am
Forum: general
Topic: Today I received.....
Replies: 4538
Views: 293216

Re: Today I received.....

Lardo Boffin wrote:
I believe they are the Z80 co processor utility discs so will be on line, probably here

http://mdfs.net/Mirror/Image/AcornCPM/


Certainly look like them. IIRC, don’t they create about 13 or so discs of actual software?
by Boydie
Mon Mar 05, 2018 7:47 pm
Forum: for sale / freebies
Topic: BeebSCSI full size + internal VFS adaptor boards
Replies: 103
Views: 3392

Re: BeebSCSI full size + internal VFS adaptor boards

My board has a row of pins.
by Boydie
Sun Mar 04, 2018 1:15 pm
Forum: for sale / freebies
Topic: BeebSCSI full size + internal VFS adaptor boards
Replies: 103
Views: 3392

Re: BeebSCSI full size + internal VFS adaptor boards

I’d be interested in one of each, please.
by Boydie
Sat Mar 03, 2018 10:27 pm
Forum: hardware
Topic: Good, modern, SCART TV
Replies: 28
Views: 1019

Re: Good, modern, SCART TV

I use an own-brand Tesco (Technika?) one. It’s about 3-4 years old, so not the latest but not obsolete either. 22”, 1080P, SCART, and 2xHDMI. Works great with my Master. And being Tesco own-brand, it’s cheap. IME, SCART just tends to work. I’ve also used a 12 year old 26” Samsung and 9 year old 20” ...
by Boydie
Fri Mar 02, 2018 7:55 pm
Forum: emulators
Topic: Strange hdf creation in VRPC
Replies: 0
Views: 257

Strange hdf creation in VRPC

I've been playing around with creating ide drive .hdf images in VirtualRPC for some time. I'd always assumed that 2Gb was the largest image I could create because that's all I'd been successful with in the past. Today, I tried again to create a 3Gb drive (6144 63 16 512). It worked fine, and formatt...
by Boydie
Thu Mar 01, 2018 9:40 am
Forum: off-topic
Topic: LOL DESCRIPTION
Replies: 598
Views: 58179

Re: LOL DESCRIPTION

Lardo Boffin wrote:
Ooh! Bitstik discs. They are rare.


Bet whoever buys/bought his Bitstick will be miffed. :lol:
by Boydie
Thu Mar 01, 2018 7:26 am
Forum: general
Topic: Maplin Electronics in administration
Replies: 79
Views: 3103

Re: Maplin Electronics in administration

My local store still stocked components, and was handy for just a few resistors/caps in a hurry. Trouble was, they no longer had an in-store catalogue and the website got progressively harder to use. Plus you had to find an assistant over 40 (preferably 50) if you wanted them to have a chance of fin...
by Boydie
Mon Feb 19, 2018 1:07 am
Forum: hardware
Topic: Can I use this to hook my Amiga to the CUB?
Replies: 8
Views: 317

Re: Can I use this to hook my Amiga to the CUB?

By default, Cub monitors take digital RGB, but can be modified to take analogue instead. ISTR it’s links ir switches inside that need to be adjusted. The Micro User published details on how to do it back in the mid-late 80s (either when the Arc came out or when Mike Cook did his chameleon board), bu...
by Boydie
Thu Feb 15, 2018 2:54 pm
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 479

Re: Memory for 80286 second processor

It’s an original Intel chip, ceramic LCC. Apparently, they only made 4 MHz parts for a limited time, back in 1982.
So the board is probably a pretty early example; pictures of other ones have a 6 MHz part.
by Boydie
Thu Feb 15, 2018 1:13 pm
Forum: for sale / freebies
Topic: Bits and bobs for freebies
Replies: 11
Views: 688

Re: Bits and bobs for freebies

Many thanks.
My Master now has a lovely pair of flaps! Although my Peartree quad rom cart no longer fits...
Charity cheque on its way.
by Boydie
Thu Feb 15, 2018 1:09 pm
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 479

Re: Memory for 80286 second processor

I thought of overclocking, but the processor itself is stamped as a 4 MHz part. Whilst I’m quite happy overclocking my modern intel procs, a 25-50% overclock of a 30+ year-old cpu is possibly unwise, particularly when I have to find a replacement when I fry it!
by Boydie
Thu Feb 15, 2018 11:58 am
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 479

Re: Memory for 80286 second processor

Great, thanks.

Just realised there’s a couple of eproms on here that won’t have been archived yet...
by Boydie
Thu Feb 15, 2018 11:50 am
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 479

Re: Memory for 80286 second processor

Thanks guys. This is an even better picture https://acorn.huininga.nl/pub/media/photo/Acorn/80286%20Second%20Processor%20(from%20the%20ABC310)/FB_IMG_1454183560008.jpg . Now that I know what I’m looking for, some of those chips do appear to be 50256-15. Ta for the large-print version of what to test...
by Boydie
Thu Feb 15, 2018 9:58 am
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 479

Re: Memory for 80286 second processor

Or possibly 64K chips with only one bank populated? I'm asssuming that they are 16pin devices? If you know the orientation of the chips you may be able to work out what they should be by tracing the power pins. Chances are they will be 4164s (or compatible). Cheers. Phill. They're 16pin devices, ye...
by Boydie
Thu Feb 15, 2018 8:14 am
Forum: hardware
Topic: Memory for 80286 second processor
Replies: 15
Views: 479

Memory for 80286 second processor

Anyone know what memory chips the 80286 Second Processor (used in the Acorn Business Machine and also in a never-released cheese wedge version) took? My board was sadly minus its ram when I got it and I’d quite like to get it running. It’s a 12MHz crystal, so presumably was clocked at 6MHz. There ar...
by Boydie
Tue Jan 30, 2018 9:15 am
Forum: hardware
Topic: Reading original RiscPC IDE drive from a modern RiscOS
Replies: 6
Views: 582

Re: Reading original RiscPC IDE drive from a modern RiscOS

Looking in the RiscOS Open forums, this seems to be a common problem. It would seem that original RPC600-era drives can’t be read in this way and the given explanation is that the Pi uses SCSIFS to read USB devices, rather than the ADFS they’re written in. Other people have reported succes with SA-m...
by Boydie
Sat Jan 27, 2018 4:24 pm
Forum: for sale / freebies
Topic: Bits and bobs for freebies
Replies: 11
Views: 688

Re: Bits and bobs for freebies

How did you know I need a cartridge flap and spring? [-o<
by Boydie
Fri Jan 26, 2018 8:12 am
Forum: off-topic
Topic: 40
Replies: 27
Views: 1134

Re: 40

I was thinking what features I’d want in a recreated beeb - faster, better screen resolutions, more colours, better sound etc, etc. All accessible from basic. Clearly Acorn styling but a bit more funky and hi-tech. Reassuringly of the beeb bloodline but at the same time new and different. Then I rea...
by Boydie
Sun Jan 21, 2018 8:02 pm
Forum: archive submissions
Topic: Atom ROMs
Replies: 3
Views: 178

Re: Atom ROMs

Don’t know if the econet roms work. Having a running econet has been on the to-do list for the past 20 years at least. Before I found them under a store room table in 1993, the atoms had been used in undergraduate teaching on an econet administered by a system 3, so it’s pretty safe to assume they w...
by Boydie
Sun Jan 21, 2018 6:15 pm
Forum: archive submissions
Topic: Atom ROMs
Replies: 3
Views: 178

Atom ROMs

I've finally got round to imaging the expansion eproms in my Atoms. I would have expected the 3 Econet roms to have been identical, but they're not so there may be some eprom degradation going on... ISTR being told in the early 90s that FP is some sort of floating point extension to Basic. ONLI alle...