Search found 180 matches

by Diminished
Sat Sep 21, 2019 12:00 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Meanwhile, next door to Roland, I am dealing with a beautiful exploded RIFA specimen.
IMG_20190921_124239.jpg
by Diminished
Fri Sep 20, 2019 11:15 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Elminster wrote:
Fri Sep 20, 2019 9:47 pm
Is there a floor plan this time? Just wondering where I will be on Sunday.
There is, but I don't remember whereabouts you are.

The DFS Toaster was finished with about four hours to spare:
IMG_20190920_191553.jpg
by Diminished
Wed Sep 18, 2019 10:35 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Hi Simon I was not being critical. I just wanted to post the weather forecast so other people could see how unseasonably warm it is going to be... Mark I didn't think that you were. It was just good for me to clarify in my mind that I'm making the right decision. I think I secretly still want to co...
by Diminished
Wed Sep 18, 2019 6:50 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Thanks guys. Like I said, I'm not going to make a fuss over it.

I don't remember how big the tables are or what exactly I'm going to bring; if I can fit on a half then I'll give up the big one.
by Diminished
Wed Sep 18, 2019 6:31 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Ok. 1 full table available. Could I upgrade to the full table from my half-table, for all three days? That would free up one half table for the whole weekend. My previous post didn't appear! cmorley pipped Diminished to the post (sorry Diminished!) in request for moving from half to full table..(vi...
by Diminished
Sun Sep 15, 2019 4:27 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.

Could I upgrade to the full table from my half-table, for all three days?

That would free up one half table for the whole weekend.
by Diminished
Sat Sep 14, 2019 10:14 pm
Forum: off-topic
Topic: Project 'less clutter' phase 1
Replies: 5
Views: 174

Re: Project 'less clutter' phase 1

Beautiful.
by Diminished
Thu Sep 12, 2019 12:25 pm
Forum: software: classic games
Topic: STH Elite disc image
Replies: 8
Views: 376

Re: STH Elite disc image

But at least Repton ( the version here? https://www.stairwaytohell.com/bbc/archive/diskimages/Superior/Repton.zip ) is undersized and can be padded out if necessary. The fact that the SSD says it's an 80 track disc can largely be ignored. Whoops, you're right. Well, that's curious; my code rejected...
by Diminished
Wed Sep 11, 2019 10:30 pm
Forum: for sale / freebies
Topic: More attic finds . . . Updated :o)
Replies: 31
Views: 976

Re: More attic finds . . .

1024MAK wrote:
Tue Sep 10, 2019 3:53 pm
I’m still wondering what on earth I can use 30A at 10V AC for.... :lol:

Mark
Pass it through a wide diameter coil of wire and wipe floppy discs with it.
by Diminished
Wed Sep 11, 2019 10:22 pm
Forum: software: classic games
Topic: STH Elite disc image
Replies: 8
Views: 376

Re: STH Elite disc image

Ah, that's interesting. In theory I could write a nonstandard disc like that, but I'd need to write a parser for hq-UEF files and since I'm doing everything on an embedded system in ARMv4 ASM with a 16K RAM workspace, I don't fancy it right now. I'm slowly finding more discs that don't have a 40-tra...
by Diminished
Wed Sep 11, 2019 7:42 pm
Forum: software: classic games
Topic: STH Elite disc image
Replies: 8
Views: 376

Re: STH Elite disc image

So side A was 40 track and B was 80 track?

Does anyone know if there's an image of the 40 track version anywhere? Both my drives are 40.
by Diminished
Wed Sep 11, 2019 7:15 pm
Forum: software: classic games
Topic: STH Elite disc image
Replies: 8
Views: 376

Re: STH Elite disc image

That explains it, thanks.

Was Elite not available at all on 40 track disc?
by Diminished
Wed Sep 11, 2019 6:20 pm
Forum: software: classic games
Topic: STH Elite disc image
Replies: 8
Views: 376

STH Elite disc image

During testing on the Disc Toaster I encountered this Elite image from the Stairway archive: http://www.stairwaytohell.com/bbc/archive/diskimages/Acornsoft/Elite.zip Downloading and extracting it yields an SSD file of 115456 bytes. The maximum size for a standard-formatted 40 track disc is 256 bytes...
by Diminished
Fri Sep 06, 2019 7:17 pm
Forum: hardware
Topic: Ain't Two Seven One
Replies: 7
Views: 593

Re: Ain't Two Seven One

Bit more progress. Fixed a couple of bugs in the FAT file cluster walking, so I could finally write a chosen SSD out to floppy disc from the SD card. I had a lot of errors though -- one or two bad sectors per track -- so I spent most of the day messing about replacing the WDATA line's base resistor ...
by Diminished
Tue Sep 03, 2019 2:43 pm
Forum: off-topic
Topic: Capturing interlaced / 50Hz video
Replies: 28
Views: 621

Re: Capturing interlaced / 50Hz video

Standalone consumer DVD recorder?
by Diminished
Tue Sep 03, 2019 2:23 pm
Forum: hardware
Topic: Last Gasp for the 8271
Replies: 24
Views: 1268

Re: Last Gasp for the 8271

I would like one or two if possible.
by Diminished
Sat Aug 31, 2019 4:20 pm
Forum: hardware
Topic: Hmm.. was there ever an 8" floppy drive for the BBC?
Replies: 39
Views: 1094

Re: Hmm.. was there ever an 8" floppy drive for the BBC?

The Model B circuit diagram contains an extra clue, as it labels one logical output to the disc drives the "LOAD HEAD" signal. "Loading heads" was apparently a process only relevant to 8 inch drives. 5¼ inch drives don't have any such mechanism; this signal is usually used instead to switch the spin...
by Diminished
Sat Aug 31, 2019 3:19 pm
Forum: hardware
Topic: Ain't Two Seven One
Replies: 7
Views: 593

Re: Ain't Two Seven One

SD FAT support is in; that was tedious, but I can now just throw large numbers of normal .ssd files onto a normal FAT16 SD card -- no BEEB.MMB nonsense. IMG_20190831_153402.jpg Searches via keyboard / LCD almost work, so then it's just pulling the pieces together. Should have a working standalone 'D...
by Diminished
Sun Aug 25, 2019 7:39 pm
Forum: hardware
Topic: Disk confusion
Replies: 28
Views: 587

Re: Disk confusion

1024MAK wrote:
Sun Aug 25, 2019 6:42 pm
It’s not normal to repeatedly press break in quick succession.
Wasn't pressing BREAK twice quickly the pre-OS-1.2 edition of Ctrl-BREAK?

Maybe Colday was remembering this behaviour from a pre-OS-1.2 machine.
by Diminished
Wed Aug 14, 2019 1:29 am
Forum: hardware
Topic: what's the use of Mode 0
Replies: 24
Views: 922

Re: what's the use of Mode 0

A tongue-in-cheek comment here would be to say "to annoy people who used RF out with a standard TV" as the ghosting effect/quality was not brilliant in M0, hampered in some cases by slightly iffy and ancient television sets. :lol: :oops: A slightly less tongue-in-cheek comment would be "to annoy pe...
by Diminished
Thu Aug 08, 2019 2:16 am
Forum: general
Topic: Disc or Disk. Silly-Season debate.
Replies: 93
Views: 1524

Re: Disc or Disk. Silly-Season debate.

It is clearly dysc.

C.f. byte.
by Diminished
Wed Aug 07, 2019 8:50 pm
Forum: hardware
Topic: Ain't Two Seven One
Replies: 7
Views: 593

Re: Ain't Two Seven One

Bonus photo! Waste of a 2214 really. Huge number of unused GPIOs in this application! The top Veroboard isn't terribly interesting. It is just buffering (a CMOS 541), some discrete NPN transistors (BC549 and BC108 I think, basically just whatever I had lying around) to implement the open-collector l...
by Diminished
Tue Aug 06, 2019 12:10 pm
Forum: hardware
Topic: Ain't Two Seven One
Replies: 7
Views: 593

Re: Ain't Two Seven One

Good project though. I don't see any scopes in the You Tube Video ! Alas, I'm afraid it didn't get used on this project -- an 8-channel USB logic analyser was more useful, since nothing goes into the MHz range. topcat96 might recognise his Cumana drive from this thread , though. I tapped 5V off its...
by Diminished
Mon Aug 05, 2019 11:35 pm
Forum: hardware
Topic: Ain't Two Seven One
Replies: 7
Views: 593

Re: Ain't Two Seven One

It would certainly get interesting, as although the data sent to every drive would be identical, you would have to synchronise with 20 index pulses from 20 drives so the timing of the data sent would be different for each one. You could just throw more microcontrollers at the problem, but I bet some...
by Diminished
Mon Aug 05, 2019 9:14 pm
Forum: hardware
Topic: Ain't Two Seven One
Replies: 7
Views: 593

Ain't Two Seven One

I needed a way to get SSD images onto actual DFS floppy discs for use with my Model B. I'm aware that there are various existing solutions for doing this but I wanted to see if I could come up with something using hardware I already had in the house, and without spending any more money. I already ha...
by Diminished
Sat Jul 27, 2019 10:28 pm
Forum: for sale / freebies
Topic: Last call - 1 item remaining!
Replies: 11
Views: 781

Re: FS: Various BBC B upgrades

I would like the Cumana drive and the SD card gizmo if those are still available, please?
by Diminished
Thu Jul 11, 2019 2:47 pm
Forum: hardware
Topic: Plugs for Model B PSU's External Power connector?
Replies: 6
Views: 253

Re: Plugs for Model B PSU's External Power connector?

Perfect, thanks guys.
by Diminished
Thu Jul 11, 2019 10:36 am
Forum: hardware
Topic: Plugs for Model B PSU's External Power connector?
Replies: 6
Views: 253

Plugs for Model B PSU's External Power connector?

I did try to find anything previously posted on this but came up blank. Apologies if that's just my being incompetent. Does anybody know where I might be able to get hold of a plug that would fit the "external" power connector on the Model B PSU? Something tells me they're probably not easy to come ...
by Diminished
Wed Jul 10, 2019 1:12 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019.
Replies: 214
Views: 7191

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019

I would like a half table for the whole weekend, please.

Last time I only stayed for the Saturday, and I chatted and took photos (and bought an oscilloscope), but I think I'll bring a machine or two along this time.

Not sure what I'm going to get up to, but a few ideas come to mind.
by Diminished
Sun Jun 30, 2019 2:13 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge 28th - 30th June 2019 BOOKING THREAD - Now FULL
Replies: 244
Views: 10476

Re: ABUG Cambridge 28th - 30th June 2019 BOOKING THREAD - Now FULL

I'm not there today, but here are a couple of bonus shots from yesterday that I left out originally. I've added an Atom since that was requested, and I had to delete my original upload of Mr. Sideburns' RGB hack board, as I accidentally captured his phone over his shoulder while he was texting someo...