Search found 542 matches

by IanS
Sat Apr 14, 2018 6:30 pm
Forum: hardware
Topic: ECONET WOES
Replies: 18
Views: 594

Re: ECONET WOES

"line jammed" is usually an indication of missing terminators (or line-biasing). Every Econet should have them, so it's just one less thing to worry about.
by IanS
Sat Apr 14, 2018 1:36 pm
Forum: hardware
Topic: ECONET WOES
Replies: 18
Views: 594

Re: ECONET WOES

Yes correct. I have my two BEEBs connected directly to the clock with no line biasing or terminators. If I need to add line biasing components as per the schematic, how is it added to the existing data pins on the clock? Is it added in parallel for example? Yes, in parallel, no need to cut any trac...
by IanS
Fri Apr 13, 2018 11:24 pm
Forum: hardware
Topic: ECONET WOES
Replies: 18
Views: 594

Re: ECONET WOES

Is the setup two beebs, two cables and a clock? Do you have any terminator or line-biasing components - viewtopic.php?f=3&t=12580&p=161029#p161029
by IanS
Sun Apr 08, 2018 5:19 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

I'm going to give a couple of these a try, next time I order from bitsbox. They look about right, I can snap 3 pins off. https://www.bitsbox.co.uk/index.php?main_page=product_info&cPath=225_230&products_id=2521 They actually work very well. If you solder the "long" end into the PC...
by IanS
Sat Apr 07, 2018 3:40 pm
Forum: hardware
Topic: File system testing
Replies: 7
Views: 467

Re: File system testing

(I sort-of got a bit fed-up waiting for Baildon recreations, sorry Dave) Tut! :roll: :lol: The problem was due to ‘ringing’. So if you keep the cable short you may be OK. Most of the "cables" I'm using are effectively zero length, I'm mainly using CF to IDE adapters plugged directly onto ...
by IanS
Sat Mar 31, 2018 12:27 pm
Forum: general
Topic: Today I received.....
Replies: 4538
Views: 293017

Re: Today I received.....

PCBs from OSHPark for Simon Inns’ Econet Clock v2 https://www.waitingforfriday.com/?p=19 the PCBs are two sided, as OSHPark don’t do single sided PCBs, but it should work ok - if this PCB does work, then I may have a board or two spare that I’d be happy to share.... Nice, if you only have a small n...
by IanS
Fri Mar 30, 2018 11:50 am
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

I'm going to wire up a set of series resistors to a standard podule version some time this week, to check that it makes the difference, then probably get some more PCB's made. I'd been putting off doing this as it seemed a tedious and error-prone task, wiring up lots of resistors. I then realised I...
by IanS
Thu Mar 29, 2018 10:29 pm
Forum: hardware
Topic: Spoofing Drive number on RiscOS
Replies: 49
Views: 897

Re: Spoofing Drive number on RiscOS

Thought about this for a couple of hours tonight and I now have a 100% robust software solution, tried and tested on my dual drive A5000. Daniel - which drive connectors did you plug your floppy and Gotek into on the A5000 PCB? I'd guess at PL10 for the floppy and PL11 for the Gotek? Or did you use...
by IanS
Wed Mar 28, 2018 7:35 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

Check these: "3M 929, 2.54mm Pitch, 36 Way, 1 Row, Straight Pin Header, Through Hole" https://uk.rs-online.com/web/p/pcb-headers/8277570/ https://media.rs-online.com/t_large/W8277570-01.jpg Available to back order for despatch 19/04/2018 In a Pack of 300 Per Pack* £543.30 Thanks. I only w...
by IanS
Wed Mar 28, 2018 4:36 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

Fair enough, I guess. I assume this is a one-off? That doesn't sound like the kind of thing to make a habit of attempting! The one I linked to, by the way, has a board-to-pin-tip length of 21mm, which sounds very nearly ideal to me. The contact area in the mainboard connectors is going to be a lot ...
by IanS
Wed Mar 28, 2018 12:55 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

But those are 25.7mm long, PCB to tip. Surely something a millimetre or two shorter is fine, but a millimetre or two longer is a problem? Things that are too long can be shortened, difficult to make things longer. I'm going to try careful use of a vice to slide the top plastic spacer down a few mm ...
by IanS
Wed Mar 28, 2018 7:50 am
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

That diagram suggests firstly that the board to board spacing is 23mm and secondly that the pins can be up to 23mm long. Either there's an inconsistency or they've used a fairly unusual design of receptacle... This isn't ideal, because it's only 8 conductors, but it does have the merit of existing....
by IanS
Tue Mar 27, 2018 10:30 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

Have you got the A3000 TRM? I'm sure there's a diagram in there showing the internal expansion dimensions, along with the circuit and layout of the internal User port/MIDI podule? Ah ha, I had a zip of the diagrams from the A3K TRM, it wan't in there. But you are right, it is in the TRM, page 35 - ...
by IanS
Mon Mar 26, 2018 9:12 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

Does anyone know what the official height should be? In the podule spec - http://www.chiark.greenend.org.uk/~theom/riscos/docs/expspec.pdf it refers to - The physical dimensions and component clearance dimensions of the mini expansion card are specified in the drawing called the Mini Expansion Upgra...
by IanS
Mon Mar 26, 2018 8:31 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

And a supplier... https://www.toby.co.uk/board-to-board-pcb-connectors/254mm-headers/ I can't quite see a suitable candidate, from the spec sheet https://www.toby.co.uk/uploads/publications/1326.pdf I think I'm looking for EW-17-??-S-600 EW with Tail 17 - pins (loger could be cut down. S- Single Ro...
by IanS
Mon Mar 26, 2018 8:26 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

Re: mini-podule pin headers

Does this now mean you can manufacture IDE boards at will? Possibly. The A30x0/A4000 8-bit card is working very well, it has the series resistors. The standard podule version (without resistors) is currently very picky about which devices it will work with. I'm going to wire up a set of series resi...
by IanS
Mon Mar 26, 2018 8:04 pm
Forum: acorn atom
Topic: Acorn Atom newly acquired not resetting
Replies: 19
Views: 609

Re: Acorn Atom newly acquired not resetting

I have just sprayed the Atom with WD40 and so far the Atom does not lock up. :shock: WD40 is almost never the right answer, to any question. Spraying it on a circuit board is bizzare. "The long-term active ingredient is a non-volatile viscous oil which remains on the surface to which it is app...
by IanS
Sun Mar 25, 2018 2:13 pm
Forum: hardware
Topic: mini-podule pin headers
Replies: 20
Views: 645

mini-podule pin headers

Following on from my success building an A30x0 IDE podule - http://stardot.org.uk/forums/viewtopic.php?f=41&t=5594&p=198367#p198367 , I'm looking for the correct pin headers. Does anyone know where to get the tall headers suitable for a mini-podule. Looks to be ~15mm between the plastic spac...
by IanS
Sat Mar 24, 2018 4:08 pm
Forum: general
Topic: Today I received.....
Replies: 4538
Views: 293017

Re: Today I received.....

IMG_20180324_152649278_HDR.jpg

A3000 IDE interface using ZIDEFS
by IanS
Tue Mar 20, 2018 9:04 pm
Forum: general
Topic: Maplin Electronics in administration
Replies: 79
Views: 3102

Re: Maplin Electronics in administration

tricky wrote:I'd like to see a games workshop maplin. Not expensive plastic and paint, but somewhere I could take my beeb and do a bit of soldering with like minded people :) maybe they could 3D print me an ashtray cover for my beeb while I solder.

Sounds to me like you just described a hackspace.
by IanS
Sun Mar 18, 2018 1:12 pm
Forum: hardware
Topic: A440 Long RAM test failure
Replies: 2
Views: 213

Re: A440 Long RAM test failure

I had a similar issue with my R140 (A440 with a different badge)

viewtopic.php?f=16&t=14064

Try a set of test roms, should tell you which chip is faulty (it did for me)

viewtopic.php?f=16&t=12252
by IanS
Sat Mar 17, 2018 1:53 pm
Forum: hardware
Topic: A3010 hard disc interface
Replies: 159
Views: 18482

Re: A3010 hard disc interface

steve3000 wrote:...since the podule bus is designed with a 2kb addressable window...?

Isn't it 4K words, it's just normally split in two for rom and peripherals. So you could use 4K, if you don't need anything else.
by IanS
Wed Mar 14, 2018 11:11 pm
Forum: hardware
Topic: A5000 Boot Error (Error Number &80000003)
Replies: 20
Views: 621

Re: A5000 Boot Error (Error Number &80000003)

Very glad to hear that another A5000 has returned to life! I'm struggling with three ailing A5000 motherboards at the moment...... BTW, perusing the Support Group Application Note No. 225, I noticed at the end a reference to the (somewhat pricey) Atomwide POST interface test box. I'm wondering if a...
by IanS
Wed Mar 14, 2018 6:55 pm
Forum: software
Topic: Required Modules - A5000/OS 3.11
Replies: 5
Views: 322

Re: Required Modules - A5000/OS 3.11

I thought I was doing well having a 16Mb A540, I can only dream of 2GB.
by IanS
Wed Mar 14, 2018 3:57 pm
Forum: emulators
Topic: Spark FS and RPC Emu Starting from Scratch again!
Replies: 10
Views: 879

Re: Spark FS and RPC Emu Starting from Scratch again!

pixelblip wrote:Filing system or path Net: Not present.

Looks like there is a hard-coded path in TtxtInit
teletext.PNG

Change it to something else.
by IanS
Wed Mar 14, 2018 2:57 pm
Forum: emulators
Topic: Spark FS and RPC Emu Starting from Scratch again!
Replies: 10
Views: 879

Re: Spark FS and RPC Emu Starting from Scratch again!

Sparkplug is the easiest way to bootstrap the system, once you have that you can open other zip files (including spark fs).

https://www.4corn.co.uk/articles/sparkplug/
by IanS
Wed Mar 14, 2018 11:59 am
Forum: hardware
Topic: ECONET AEH60 schematics & ROM image
Replies: 11
Views: 389

Re: AEH60 schematics & ROM image

danielj wrote:Can't see any other use for it - although it could store updated modules I guess....

Looks like it:-
http://www.beebmaster.co.uk/32bit/A7000FixNet8.html
by IanS
Mon Mar 12, 2018 10:53 pm
Forum: hardware
Topic: ECONET AEH60 schematics & ROM image
Replies: 11
Views: 389

Re: AEH60 schematics & ROM image

jgharston wrote:
Ottly wrote:Do the schematics exist for this econet interface?
this one?

No, the AEH60 fits in the RISC-PC/A7000 network slot. That schematic also doen't have the collision detection, so shouldn't be used.
by IanS
Mon Mar 12, 2018 10:51 pm
Forum: hardware
Topic: ECONET AEH60 schematics & ROM image
Replies: 11
Views: 389

Re: AEH60 schematics & ROM image

I've never seen a schematic, but the fact it has programmable logic on the board would make it hard to reproduce, unless you had the details of the logic within. Do you want to re-create one just to get Econet on a RISC-PC/A7000, as there are simplified circuits that can use a standard master module...
by IanS
Mon Mar 12, 2018 8:54 pm
Forum: hardware
Topic: Econet Bridge Circuit Diagram
Replies: 7
Views: 937

Re: Econet Bridge Circuit Diagram

So, has anybody already built a homebrew Econet bridge? Not quite the same shape PCB, and it uses two econet modules rather than having the 6854's on-board, but it works fine. http://www.stardot.org.uk/forums/viewtopic.php?f=41&t=5594&p=163890#p163890 Beebmaster has some better photos of it...