Search found 200 matches

by SteveBagley
Wed Oct 02, 2019 1:02 pm
Forum: hardware
Topic: A680s
Replies: 19
Views: 2260

Re: A680s

Did any of these ever get repaired?

Steve
by SteveBagley
Sat Sep 28, 2019 9:00 pm
Forum: for sale / freebies
Topic: Apple Mac Plus 1MB
Replies: 1
Views: 174

Re: Apple Mac Plus 1MB

If anyone does buy it (they are great machines), don’t forget to replace the RIFA capacitors on the analog board!

Steve
by SteveBagley
Fri Sep 27, 2019 9:55 am
Forum: hardware
Topic: A4 Laptop - replacement electrolytic capacitors and CMOS battery
Replies: 21
Views: 813

Re: A4 Laptop - replacement electrolytic capacitors and CMOS battery

Picked up a box of these to recap the A4: https://www.amazon.co.uk/gp/product/B07NK9SKNJ/ (440-piece SMD electrolytic capacitor kit) Looks like it has the right sizes and values, and it's cheaper than buying the parts individually from RS... Expect more updates this weekend! Please take lots of pho...
by SteveBagley
Fri Sep 20, 2019 1:25 pm
Forum: general
Topic: Acorn Discord group?
Replies: 9
Views: 305

Re: Acorn Discord group?

trixster wrote:
Fri Sep 20, 2019 9:28 am
Think of it as modern IRC.
What's wrong with just using IRC (or XMPP for that matter)?

Steve
by SteveBagley
Sat Sep 14, 2019 9:08 am
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 37
Views: 925

Re: Capturing interlaced / 50Hz video

dominicbeesley wrote:
Tue Sep 10, 2019 3:28 pm
You do if it contains a RobC nula!
True -- although then you could just capture the data input into the nULA and implement a nULA emulator in software :)

Steve
by SteveBagley
Tue Sep 10, 2019 2:40 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 37
Views: 925

Re: Capturing interlaced / 50Hz video

dominicbeesley wrote:
Tue Sep 10, 2019 1:37 pm
the blocker on this is that most of the good ADC's seem to be either end-of line or very expensive.
You don't need an ADC for the Beeb -- the RGB output is TTL level. I successfully used a cheap USB logic analyser to capture the video in the past.

Steve
by SteveBagley
Thu Aug 15, 2019 8:06 am
Forum: hardware
Topic: Noisy Mode 7 display
Replies: 42
Views: 1294

Re: Noisy Mode 7 display

Thinking it might be a ram issue, I typed in one of the simpler ram test issues I found in the forum (the one which reads from &3000 to &8000 and looks for non-zero values), I found that it reports 255 at &3000 and every 256 bytes thereafter. Which seems to support the theory. That’s an odd error… ...
by SteveBagley
Thu Aug 01, 2019 10:21 pm
Forum: off-topic
Topic: Toshiba TV Haunted!
Replies: 19
Views: 801

Re: Toshiba TV Haunted!

I suspect a modern TV doesn't actually switch itself off properly unless you disconnect it from the wall -- so doing a first-time install probably forced the TV to reboot fully and hence fix the problem.

Steve
by SteveBagley
Thu Aug 01, 2019 10:14 am
Forum: off-topic
Topic: Toshiba TV Haunted!
Replies: 19
Views: 801

Re: Toshiba TV Haunted!

The TV is still under warranty, only bought in February 2019, but regrettably the receipt has been mislaid. I'd try taking it back to the shop anyway -- presumably you paid for it using a credit/debit card which should be enough for them to find the transaction on their system if you take the credi...
by SteveBagley
Sun Jul 28, 2019 10:48 pm
Forum: hardware
Topic: A310 restoration
Replies: 74
Views: 2886

Re: A310 restoration

Given… It's a standard ARM2, with what looks like an IFEL 2Mb upgrade and RISC OS 3. And the symptoms… I've replaced the 3 tantalums, but powering it up (with a known working PSU) the power LED lights and a brief flash of the keyboard lights, but no other signs of life - no video signal or any flopp...
by SteveBagley
Sat Jul 20, 2019 11:31 pm
Forum: introduce yourself
Topic: Hello from a long-time Acorn User
Replies: 27
Views: 1192

Re: Hello from a long-time Acorn User

Econet interface in the beeb, card in the A410, Level 4 FS software on the 410, some form of cabling (midi cables work well, but you'll need to make socket boxes and terminators: https://www.retro-kit.co.uk/page.cfm/content/Econet-Socket-Box/), and you'll need a clock. Simon's is a neat, cheap, des...
by SteveBagley
Fri Jun 07, 2019 10:38 pm
Forum: hardware
Topic: Any machine ever have combined raster and vector video system?EDITAn impossiblity I think?
Replies: 15
Views: 814

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

I doubt that SECAM was ever considered for the UK, it's so clearly inferior to PAL. Obvious shortcomings are having half the vertical chroma resolution of PAL and having inferior monochrome compatibility (i.e. worse cross-luminance); I think it probably has worse cross-colour too. NTSC was seriousl...
by SteveBagley
Fri Jun 07, 2019 10:24 pm
Forum: general
Topic: Sophie Wilson CBE -- Birthday Honours
Replies: 3
Views: 415

Sophie Wilson CBE -- Birthday Honours

Looks like Sophie Wilson got a CBE…

https://www.cambridgeindependent.co.uk/ ... s-9072862/

Steve
by SteveBagley
Thu Jun 06, 2019 4:53 pm
Forum: introduce yourself
Topic: Greetings from Nottingham England!
Replies: 12
Views: 532

Re: Greetings from Nottingham England!

Greetings

Steve (also in Nottinghamshire)
by SteveBagley
Thu Jun 06, 2019 4:52 pm
Forum: general
Topic: Today I received.....
Replies: 5448
Views: 430616

Re: Today I received.....

jonb wrote:
Thu Jun 06, 2019 2:42 pm
Problem now is I have to move the Superbrain off the desk to make space so I can triage them. There is absolutely no space in here!
Prediction: tomorrow you’ll be posting a picture of the new bigger desk that you’ve bought :P

Steve
by SteveBagley
Thu May 30, 2019 11:25 am
Forum: emulators
Topic: MAME: EuroBEEB
Replies: 5
Views: 642

Re: MAME: EuroBEEB

I've just copied the EPROM on my EuroBeeb and it's attached. The EPROM has a sticky label with 'MosB.1 is 6 Cugraph E6CB' written on it. The only other ROM is an an Acorn HM613128PB05 and there are also a couple of static RAM chips on the board. No idea what's on the EPROM since I've not yet tried t...
by SteveBagley
Fri May 17, 2019 1:37 pm
Forum: software
Topic: Omnibus w/RISC 3.7 - need to network connect
Replies: 16
Views: 602

Re: Omnibus w/RISC 3.7 - need to network connect

Currently I have no unix machines so doing it that way is a problem, for now. I can probably create a Unix machine though. I have a machine that just needs a hard drive. Unfortunately, at the moment, I don't know much about Unix/Linux but it shouldn't be hard to figure out what I need to do to crea...
by SteveBagley
Thu May 16, 2019 12:13 pm
Forum: software
Topic: Omnibus w/RISC 3.7 - need to network connect
Replies: 16
Views: 602

Re: Omnibus w/RISC 3.7 - need to network connect

What you've got there is an Omnibus Serial Engine -- it's designed to be rack-mounted alongside a broadcast video recorder, disk server, vision mixer or other bit of broadcast hardware, and connects to that kit via RS422/RS232 (hence the RS232 podule in the machine). The machine would be sent instru...
by SteveBagley
Wed May 15, 2019 6:51 am
Forum: software
Topic: Omnibus w/RISC 3.7 - need to network connect
Replies: 16
Views: 602

Re: Omnibus w/RISC 3.7 - need to network connect

I have a couple of Omnibus serial engines here — they are just normal A7000+ motherboards with a 4-port backplane and an Ethernet podule in a 1u rack case. (There’s normally a few other podule as well, and the network slot is used to interface with the front panel controls.) If you just want to use ...
by SteveBagley
Sat May 04, 2019 5:48 am
Forum: hardware
Topic: hi purchased an a3000 ide drive and need help
Replies: 17
Views: 863

Re: hi purchased an a3000 ide drive and need help

Now i have another question how i get software into the Arquimides, doing this on floppy's could be painful. RISC OS 3.11 can read (and even format) PC format (albeit only 720KB in an A3000) floppies, so you can just download the software on a PC /Mac and copy it onto a floppy. You’ll probably need...
by SteveBagley
Fri Apr 26, 2019 2:30 am
Forum: hardware
Topic: A310 restoration
Replies: 74
Views: 2886

Re: A310 restoration

Try powering it up with the 12V (yellow) wire to the motherboard disconnected — doing that revived one of my A310s. There was a short on the motherboard (from a tantalum, I think) which stopped the PSU providing any power to the MB. The 12V line is only used to drive the fan header on the A310 iirc ...
by SteveBagley
Thu Apr 18, 2019 12:05 pm
Forum: other vintage computer hardware, software and games
Topic: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)
Replies: 16
Views: 709

Re: YOUR COMPUTER's BBC MICRO REVIEW and the hateful days of type-in listings (VIC20 edition)

I'd suggest size of the ALU as a potential indicator for the 'bittedness' of a CPU but that would make the Z80 a 4 bit CPU.

Steve
by SteveBagley
Sun Apr 14, 2019 2:02 am
Forum: other vintage computer hardware, software and games
Topic: Those Spectrum nerds, eh?
Replies: 26
Views: 944

Re: Those Spectrum nerds, eh?

HAM radio was (and still is) a big hobby for a lot of people -- this just sounds like someone who wants to combine his hobbies together (no different from the number of people who sought to control their model train sets via a computer -- a big enough audience to support several books on the subject...
by SteveBagley
Thu Apr 11, 2019 9:42 am
Forum: general
Topic: Today I received.....
Replies: 5448
Views: 430616

Re: Today I received.....

A strong candidate for retrobrite, if ever I saw one! Seems to have 4Mb installed though. :D Probably worth checking it's not got 2.5MB installed -- the STe mis-detected 2.5MB as 4MB and required a patch program to be run at boot up). There's some good RAM test software for the ST here: https://www...
by SteveBagley
Fri Apr 05, 2019 1:51 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2936
Views: 271728

Re: LOLPRICE

Looks like a hair to me. I did try to report the item (misleading to the max, new my backside!) but the report form does not have the right options. Look at the grime around the plug - I agree it's well used. He doesn't even say if it works... Didn't Spectrum's come without a plug fitted anyway… St...
by SteveBagley
Thu Apr 04, 2019 5:42 pm
Forum: hardware
Topic: Phoebe PCB
Replies: 34
Views: 3270

Re: Phoebe PCB

SarahWalker wrote:
Thu Apr 04, 2019 5:05 pm
FWIW, I did do some reverse engineering of Phoebe and the IOMD20 chip based on the RISC OS 3.8 ROM from CCH's machine a few years ago, which made its way into RPCemu. So at least _some_ of it got preserved.
Is the RISC OS 3.8 image available online?

Steve
by SteveBagley
Thu Apr 04, 2019 3:07 pm
Forum: hardware
Topic: Phoebe PCB
Replies: 34
Views: 3270

Re: Phoebe PCB

But then they just keep most of it locked away in some store room somewhere? Also not quite access for all as they are restricted to the locality as well. I'd love to go to Bovington tank museum but considering it's at complete other end of the country, it just not practical unless you made a holid...
by SteveBagley
Thu Apr 04, 2019 1:01 pm
Forum: hardware
Topic: Phoebe PCB
Replies: 34
Views: 3270

Re: Phoebe PCB

I stand by my comments, I think enthusiasts with our websites, clubs, blogs, fanzines etc. do these things far better. I don't see the point in them. I think you'll find that it is exactly the same people as you describe above who are running the computer museums… And what the computer museums prov...
by SteveBagley
Thu Apr 04, 2019 11:59 am
Forum: hardware
Topic: Phoebe PCB
Replies: 34
Views: 3270

Re: Phoebe PCB

I think it comes down to what you are trying to preserve… I'd argue that you need to think about preserving computers as requiring many different approaches since they can be viewed in many different ways. At one level, you can view them as a historic cultural artefact and left unmodified from that ...
by SteveBagley
Mon Apr 01, 2019 8:05 am
Forum: other vintage computer hardware, software and games
Topic: More troubles with my CM8833
Replies: 2
Views: 271

Re: More troubles with my CM8833

Almost certainly saying something you’ve already tested and stating the obvious, but have you checked the saturation control? :) Looking at the full circuit diagram suggests that the saturation control only affects the composite input of the CM8833, so it might be worth checking that and/or the driv...