Search found 401 matches

by simoni
Tue Jun 19, 2018 3:06 pm
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

There's no arbitration of the bus in ADFS. The host ID is always 1 and it supports 1 target with 4 LUNs (8 LUNs under VFS).
by simoni
Tue Jun 19, 2018 1:27 pm
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

The SCSI-1 interface implemented by ADFS is really SASI. It was made at a point where SASI was being transformed into SCSI. It's probably why little original documentation exists. The Adaptec ACB-4000 documentation (which is widely available) contains the specific implementation used by Acorn (as it...
by simoni
Tue Jun 19, 2018 11:27 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

As part of the Domesday86 project I've produced extensive documentation on the SCSI-1 protocol used by ADFS and VFS. There is also BeebSCSI which emulates both SCSI-1 hard drives and the VP415 LaserVision player used by Domesday. BeebSCSI also includes a verilog implementation of both the internal A...
by simoni
Tue Jun 19, 2018 3:58 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

The board is a replica of the Acorn AIV SCSI adapter. It's designed to connect to PL12 and be mounted inside the BBC Master (if you look up the AIV SCSI board original - this board does exactly the same). The logic of the AIV SCSI adapter and the original BBC 1MHz bus adapter is not the same, so the...
by simoni
Mon Jun 18, 2018 8:53 pm
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

I'm still waiting on the resistor networks. I found some via eBay, but they have been stuck in customs for over three weeks... I sent some emails yesterday to the seller and the postal company and I'm waiting for a response. Frustrating, but there you go. I've not abandoned it though :)
by simoni
Sun Jun 10, 2018 2:47 pm
Forum: hardware
Topic: Gotek noob - trying to get beebug C to work on a datacentre
Replies: 49
Views: 666

Re: Gotek noob - trying to get beebug C to work on a datacentre

how much do BeebSCSI’s go for? It's completely open-source hardware, so you can build one for yourself if you like - everything from the board design to the source code is on github. Otherwise there are usually people making and selling them (35-40 quid seems to be the price-point). I don't sell th...
by simoni
Sun Jun 10, 2018 1:07 pm
Forum: hardware
Topic: Gotek noob - trying to get beebug C to work on a datacentre
Replies: 49
Views: 666

Re: Gotek noob - trying to get beebug C to work on a datacentre

If you can get your hands on one; you could try a BeebSCSI instead. It works with the unpatched version of ADFS and doesn't require any additional ROMs or commands to work. If the software worked with an Acorn Winchester; it'll work with a BeebSCSI. It's also 3x faster than CF cards (and much, much ...
by simoni
Sat Jun 02, 2018 2:03 pm
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 178
Views: 14524

Re: BeebSCSI mini

but, there is a way to use beebSCSI with the A3000? Well, BeebSCSI is two things... An Acorn SCSI-1 host adapter (well, 3 things - since it's also an AIV SCSI adapter) and a SCSI-1 drive emulator. The SCSI-1 drive emulator is probably quite universal, but the host adapter isn't really suitable for ...
by simoni
Sat Jun 02, 2018 1:34 pm
Forum: hardware
Topic: Acorn Master and Electron cartridge breakout
Replies: 44
Views: 1122

Re: Acorn Master and Electron cartridge breakout

You'll have to source (make) the IDC cable yourself.
The reason I decided on a 50-way cable was a lot to do with the fact that's what SCSI-1 uses... so if you can find a short SCSI-1 cable, it's probably cheaper than making one :)
by simoni
Sat Jun 02, 2018 1:28 pm
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 178
Views: 14524

Re: BeebSCSI mini

DIY one pieces only seem an expensive solution The BoM cost per board comes out at around 25 UKP a board depending on quantity (which isn't really that much ;) ); whichever way you do it, making several requires some investment. Single quantities are more costly, as are distributors like Farnell. T...
by simoni
Fri Jun 01, 2018 5:37 am
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 178
Views: 14524

Re: BeebSCSI mini

To remove any guesswork, I've included the manufacturing specs for the PCB on the project pages (these match JLCPCB's options): https://www.domesday86.com/?page_id=409#Manufacturing_information There's a bill of materials on the page also. For soldering the board together (with a normal soldering ir...
by simoni
Thu May 31, 2018 4:16 am
Forum: for sale / freebies
Topic: BeebSCSI full size + internal VFS adaptor boards
Replies: 106
Views: 4871

Re: BeebSCSI full size + internal VFS adaptor boards

Do the vfs images exist anywhere or was that a hyperthetical solution? Right now they are not 'generally' available due to copyright and the BBC. If you have a Domesday system (and the discs) it is possible to make a copy though. There are images of the VFS partitions floating around due to the CAM...
by simoni
Wed May 30, 2018 8:17 am
Forum: hardware
Topic: Acorn Master and Electron cartridge breakout
Replies: 44
Views: 1122

Re: Acorn Master and Electron cartridge breakout

not looking to make a profit, just to cover the cost+postage
You should always at least cover cost, postage and your own board. That way you get the warm feeling of getting something for free even though it made you do a lot of work to get there :D
by simoni
Tue May 29, 2018 12:08 pm
Forum: hardware
Topic: Acorn Master and Electron cartridge breakout
Replies: 44
Views: 1122

Re: Acorn Master and Electron cartridge breakout

Will add to hardware list when I get a spare second
Thanks!
Thanks for making it available
You're very welcome - I hope it proves useful :)
by simoni
Tue May 29, 2018 9:37 am
Forum: hardware
Topic: Acorn Master and Electron cartridge breakout
Replies: 44
Views: 1122

Acorn Master and Electron cartridge breakout

I recently designed a breakout board for the Master and Electron's cartridge interface. The design features 2 PCBs, one which plugs into the cartridge slot of the computer and another which fits down the side of a standard breadboard to make it far easier to prototype designs. Interconnection is via...
by simoni
Sun May 27, 2018 8:24 am
Forum: for sale / freebies
Topic: BeebSCSI mini
Replies: 178
Views: 14524

Re: BeebSCSI mini

This is a cased BeebSCSI mini for the AP5 Looks nice :) But you do realise that the new 7_7 board supports the 'Dave Hitchins' configuration now? :) 12mm clearance height is all it needs: BeebSCSI 7_7 - RA Configuration.jpg Edit: You can also have the microSD card poking out the case as the new boa...
by simoni
Sun May 27, 2018 7:41 am
Forum: hardware
Topic: BeebSCSI 7_7
Replies: 2
Views: 196

Re: BeebSCSI 7_7

There is also a new version of the BeebSCSI firmware available now (V2.4): https://github.com/simoninns/BeebSCSI/releases/tag/V2.4 This release adds enhancements to the debug output (to assist people making boards) as well as PWM brightness control of the status LED. Now, instead of flashing on and ...
by simoni
Sat May 26, 2018 1:58 pm
Forum: hardware
Topic: BeebSCSI 7_7
Replies: 2
Views: 196

BeebSCSI 7_7

BeebSCSI has a newly designed (KiCAD) PCB now available that is smaller and designed for both internal mounting (in the BBC Master) or mounting in an external case: Github - https://github.com/simoninns/BeebSCSI BeebSCSI documentation - https://www.domesday86.com/?page_id=689 The new design also all...
by simoni
Sat May 26, 2018 5:34 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

Can't wait to see this The 'test' build is almost complete; just waiting on the resistor network to be delivered (it's a bit of an odd component). This board is just to make sure everything is ok - for the real versions I'm going to try and find some grey cable and some more 'authentic' looking cap...
by simoni
Thu May 17, 2018 4:12 am
Forum: hardware
Topic: SD cards which don't work with MMFS/SmartSPI/etc.
Replies: 13
Views: 339

Re: SD cards which don't work with MMFS/SmartSPI/etc.

A lot of the time many of the cards people list as 'fake' or 'don't support SPI' are in fact cards that work fine, but require closer adherence to the communication specs for SD cards. If you look at the Chan FAT FS project examples you'll see the recommended "works with almost anything" design: avr...
by simoni
Wed May 16, 2018 3:49 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

The AIV SCSI boards have now turned up. Eagle-eyed viewers will notice that I added a ground-plane to the underside of the board (to keep the signal shapes a little better). I didn't add this to the top-side though in order to keep the board's 'original' look when installed. I now have all the requi...
by simoni
Sat May 12, 2018 9:13 am
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 21
Views: 808

Re: myelin’s Econet Hub

Apologies, I should have made it clear in my first post that the Econet hub runs a modified version of your Econet clock 2 firmware That wasn't what I was after - the code is open-source and you are welcome to use it in anyway you like (following the GPL of course) - I don't need a mention every ti...
by simoni
Sat May 12, 2018 9:10 am
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 21
Views: 808

Re: myelin’s Econet Hub

Very cool stuff :) As a thought, you might want to put solder bridge pads on your next revision to set the speed. Just a couple of closely spaced SMD pads that you can drag solder across. It's a very cheap DIP switch :) There are two types in KiCAD, one open and the other has a small link which you ...
by simoni
Sat May 12, 2018 7:06 am
Forum: hardware
Topic: myelin’s Econet Hub
Replies: 21
Views: 808

Re: myelin’s Econet Hub

I'm assuming that the ATTiny is still running my Econet clock firmware? It's been really cool to watch this evolve from my "I need a Econet clock!" moment , all the way to an all-singing, all-dancing Econet solution. Nice work chaps :)
by simoni
Sat May 12, 2018 6:52 am
Forum: hardware
Topic: Master 128 keyboard restoration
Replies: 3
Views: 201

Re: Master 128 keyboard restoration

am I correct in assuming that I can just pull the keyswitch out from the top of the keyboard once it's desoldered? Yes; make sure the desoldering is clean though - you should be able to wiggle the pins with the tip of a screwdriver - before attempting to pull the keyswitch (this verifies that there...
by simoni
Sat May 12, 2018 6:47 am
Forum: hardware
Topic: Master 65C102 Co-pro - Hi-res PCB scans
Replies: 1
Views: 191

Master 65C102 Co-pro - Hi-res PCB scans

Just a note to say I've published high resolution (600 dpi) scans of the Master internal 65C102 co-processor PCB. You can find the images from the following link: https://www.domesday86.com/?page_id=1962 Hopefully a corrected schematic will follow soon (as there isn't currently one available and it ...
by simoni
Fri May 04, 2018 7:37 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

I'll have to look into the possibility of building some; but it probably won't be cheap since it's all PTH components and the PCB is a very odd size as well as being big :) Files are all on Github though; so you are all welcome to spin your own in the meantime!
by simoni
Thu May 03, 2018 8:17 pm
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

So in theory - an acorn Winchester 110'130 system could drive a SCSI1 directly off the SCSI host Adapter Board? Yes Would ADFS recognize it? Providing it supports 256 sectors, yes. People are using things like SCSI2SD for exactly that. Although you'd be better off putting a BeebSCSI in the Winchest...
by simoni
Thu May 03, 2018 11:44 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

Is the acorn SCSI host adapter the card in the acorn Winchester 110/130 device? Yes, it's part of it. The Winchester was: Acorn SCSI Card -> Adaptec ACB-4000 SCSI to MFM adapter -> MFM Hard drive For the Domesday system the SCSI to Laserdisc part (equivalent to the ACB-4000) is built into the VP415.
by simoni
Thu May 03, 2018 11:25 am
Forum: hardware
Topic: Acorn Domesday AIV SCSI Boards - now free...
Replies: 25
Views: 1072

Re: Acorn Domesday AIV SCSI Boards - now free...

No, the AVI SCSI adapter is just SCSI. In Domesday all the analogue video mixing was performed by the VP415. The board works with VFS and that will work with any SCSI drive ADFS can use (as VFS is really just a read-only version of ADFS). One note though is that VFS uses about 3 times slower DMA tha...