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Someone requested these some time ago.

Novelty interest only, since the scan of the official circuit diagram already exists.
This is a copy of an earlier hard-drawn draft, before it got properly formatted.

Acorn's Technical Reference Manuals for various System boards.

As promised, here is the Acorn app note on upgrading Atom Econets to work with BBC hardware. Along with various other Acorn Atom-related documents.

If you go for (5) then some of the components need to be changed for it to work on an Econet with BBCs on it.

I’ve got an Acorn app note (from before they called them app notes) that I need to get scanned in which details the changes required. Along with a load of other similar Acorn documents.

The disk image is a 200K ssd. A CPM disk is image normally 400K, it seems only side 0 is now imaged. Since there was interesting stuff at the end of the image there may be more on side 1? Any chance of imaging the original disk as a dsd 400K image? Sadly, the other side is blank. I tried imaging it...

Took me a while to find the hxe tools image creator but it works fine.
Many thanks!

See also:

http://mdfs.net/Software/Tube/Z80/ABC/notes

This explains how the BBC series boots from MFM discs

Sadly not. I acquired all my Z80 stuff nearly 25 years ago now and haven't used it much for about 20. So far as I can remember, I got all the Z80 software from Trintity College, Cambridge when they were selling it all off. The Winchester Utils presumably came as part of that lot. They only had Z80 s...

Acornsoft's DOS Plus with Econet Software

Disk image is ADL format, copied from original disk to Gotek. Scan of manual is included - someone cleverer than me will have to OCR it!

I'm trying to copy my Master 512 disks onto my Gotek drive. The Acorn DOS+ disk works fine as an ADL image, and I can create new bootable 640K disks without problem. However, nothing seems to work for creating the 800K Acorn DOS images. I've tried downloaded images of the GEM disks, and formatting n...

Don't know if this is already widely available. It's an image of Acorn's Winchester Utilities Disc for the Z80 Second Processor. It adds a virtual CP/M disc image to a hard disc, for use as Drive C, similar to DOS+ and the 512. I'm sure I had it working on a real Z80 2P hooked up to my Master back i...

Does such a version exist? No, but it's easy to add. I've done a test build here: mmfs_test.zip The build you need is MMFS3.rom (which uses &FEA0 as the VIA address). Please give this a try and see if it works. Unfortunately, with these extra builds, some of the disks images are overflowing during ...

I suspect there isn't a suitable build out there for what I'm trying to do... I'm running an SD card on my Master, connected to an additional VIA interface in the Econet socket. I've downloaded the approriate MMFS for this, and it works great. (The real User Port has an AMX Mouse plugged into it). U...

I used the guide on Retroclinic - http://www.retroclinic.com/acorn/swr/swr.htm It’s very straightforward and worked great first time. I wondered the same thing as you - how can an individual 16k rom slot be selected if all pin 1s are wired together, and all pin 27s (except those planned for use with...

If it’s the MFM variant it should work fine. I’ve used several early Seagate 5.25 MFMs with mine, both full and half height.
Currently using a 100MB full height 5.25” Seagate. I wasn’t aware the ST506 specs went that high until I encountered this beast!

Just noticed how this topic appears when viewed on an iPhone:

Ideas please for better beep when Second Processor is present
Last post


Surely that’s more appropriate for shutdown than startup!

Thanks for the sound commands dv8. I wonder if two or three choice notes/chords from Also Sprach Zarathustra, Op. 30 - Strauss mightn't be in order. Perhaps the two chords at 0:46... or at 1:05. I'm admit, it's more or less a ta-da! Or go the whole hog, with the most famous chords from that piece. ...

Oo, plywood and perspex.

Classy!

It may work. It depends largely on whether the VCR has the full SCART pinout wired up - quite a few only had composite or s-video, and nothing on the RGB inputs. However, is it worth it for the quality you'll get? UHF input was okay for the low-resolution modes, but 80-column was pretty much unreada...

Thanks for the reassurance. I usually power the wedge before the computer anyway, but will make doubly sure now.

I’ve customised a defunct teletext adapter wedge as an expansion unit. It’s comfortably taken a datacentre complete with CF reader, plus a Pi 3A+ co-pro. There’s space left over for a BeebSID. Everything is powered by the 5V output from the wedge, with the link removed from the PiTube module so no p...

My bare board arrived yesterday (thanks GadgetUK164). Can anyone confirm whether the SWinSIDs available on Ebay work correctly with it these days? In the past, results seem to have been mixed... Are any mods required to use one? I do have a non-working C64 that I can cannibalise if needs be, but I’d...

They’re VIDC1 (production Arcs used VIDC1a) in the rear-right corner and early MEMC near the ARM. Not sure if ARM1 and 2 are pin-compatible, but my A500 (ARM2) is an Issue B board. Could be that Issue A was socketed for LCC chips (ARM1) and Issue B for PLCC (ARM2)... edit: Just checked the ARM Famil...

Both mine are 8625 and Autumn as well.

Neither has a proper serial number, but one has a “51” label on the board, the other “56”. I’m guessing this was Acorn’s internal serial system. If so, it gives a minimum to the number if Arm1’s made.

As requested by anightin, Bitstik rom version 1.0

Apologies if it's already available elsewhere

Not sure if Bitstik ever came with an actual rom. Mine (fully boxed with manual etc, so presumably as sold) came with a labelled eprom. IIRC my prestel adapter also came with a labelled eprom. Perhaps Acorn only made real roms for the stuff they expected to sell a reasonable amount of? Happy to send...

Sadly, no.
Or an Econet/X25 gateway, which was apparently purple!

Probably forget a few: System 3 Atom x2 BBC Model A BBC Model B x4 BBC Model B+ 128 Electron BBC Master x3 (Turbo, 512, ET) Communicator Briefcase Communicator Cambridge Workstation x2 (one 32016, one ARM1) A310 x 3 A420 A540 A500 A680 A3000 x2 A3010 A4000 A5000 A4 R140 RiscPC x2 (600 & 700) ZX81 x2...

The HP USB Disk Storage Format Tool has worked for me. Apparently, it can be a bit flaky under Windows 10, but I’ve never had an issue.