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by BeebMaster
Fri Jan 20, 2017 7:41 pm
Forum: off-topic
Topic: Ubuntu on Raspberry Pi 3!
Replies: 10
Views: 1048

Re: Ubuntu on Raspberry Pi 3!

I'd say I've got my Ubuntu RPi3 to a state which is now almost useable as a "desktop computer". Still some things won't work. I can't install Skype, or Lightning for Thunderbird, and I had to go for Libre office because Open Office doesn't appear to be available. On a distribution upgrade ...
by BeebMaster
Fri Jan 20, 2017 6:32 pm
Forum: hardware
Topic: Domesday86 Project
Replies: 82
Views: 3459

Re: Domesday86 Project

ISTR reading that the BBC didn't get copyright waivers from all their contributors (and don't know who many of the contributors are) so even they are on slightly dodgy ground when it comes to using and publishing the data these days. Paul Well I think all this agonising over copyright is bunk. In t...
by BeebMaster
Fri Jan 20, 2017 6:24 pm
Forum: past events & exhibitions
Topic: RISC OS SouthWest Show - Sat 25th Feb, 2017
Replies: 15
Views: 898

Re: RISC OS SouthWest Show - Sat 25th Feb, 2017

I've been to the 2013 and 2016 South-West shows, along with IanS. It's a bit smaller and a lot (for us) further away than Wakefield, but worth a look once in a while.
by BeebMaster
Tue Jan 10, 2017 11:12 pm
Forum: off-topic
Topic: Ubuntu on Raspberry Pi 3!
Replies: 10
Views: 1048

Re: Ubuntu on Raspberry Pi 3!

Nah, only took three days!

Actually, only steps 1-4 are needed, you're in after that, the rest is customising it for my own use.
by BeebMaster
Tue Jan 10, 2017 7:55 pm
Forum: off-topic
Topic: Ubuntu on Raspberry Pi 3!
Replies: 10
Views: 1048

Ubuntu on Raspberry Pi 3!

It may not be news, but it was certainly news to me that there is now a full Ubuntu 16.04 image for the Raspberry Pi (3)! It's been around since about April but this past weekend was the first time I've had a go with my Pi 3 since around that time, when I could only find downloads for Ubuntu server ...
by BeebMaster
Sat Jan 07, 2017 12:12 pm
Forum: hardware
Topic: Domesday86 Project
Replies: 82
Views: 3459

Re: Domesday86 Project

Very nice and thanks for all the effort! I'd definitely be interested in anything SCSI flavoured if a run of boards is made.
by BeebMaster
Sat Jan 07, 2017 12:07 pm
Forum: software: other
Topic: bbc master hard drive winchester how to backup
Replies: 13
Views: 788

Re: bbc master hard drive winchester how to backup

I wouldn't try doing it via a serial link, that amount of data would take a very long time to transfer. You could transfer the files via Econet, using the BBC with the Datacentre as a Level 3 file server. For a small network of two stations you can connect the two together via an Econet clock so all...
by BeebMaster
Sat Dec 24, 2016 12:28 pm
Forum: hardware
Topic: Econet pinout
Replies: 9
Views: 559

Re: Econet pinout

Hmmm, this is interesting. On the one hand, if in doubt, rewind to 1981! The Acorn Econet Technical Manual (March 1981, predating the BBC Micro) has the "correct" pinout: The network is connected by four core twisted pair cable which may be up to 1 kilometre long. The use of a differential...
by BeebMaster
Sun Dec 18, 2016 2:29 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

I've noticed a few other things going on when trying to run the National Disc from ADFS. It still looks at VFS - if there is no disc in the drive, it ejects the tray, same as happens if you try to mount with the drive empty. If the LV-ROM player isn't switched on and plugged into the AIV SCSI board,...
by BeebMaster
Sat Dec 17, 2016 10:42 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Good work, although I do wonder if there is still some translation or bodgery going on at some level with Domesday when it deals with the masses of data within the large files and only needs to access a specific bit. My ADFS copy of the Community Disc N works, but after a few moves I find that the t...
by BeebMaster
Sat Dec 17, 2016 10:30 pm
Forum: programming
Topic: Writing to Second Processor Memory from Sideways ROM
Replies: 3
Views: 274

Re: Writing to Second Processor Memory from Sideways ROM

Thanks very muchly for that, I've got it doing what it needs to be doing now - quite a faff to say I only wanted to transfer 6 bytes!!!
by BeebMaster
Sat Dec 17, 2016 5:52 pm
Forum: programming
Topic: Writing to Second Processor Memory from Sideways ROM
Replies: 3
Views: 274

Writing to Second Processor Memory from Sideways ROM

How do I store a byte in a location in the second processor RAM from a sideways ROM? In my ROM image code, basically I have an "STA location" instruction. With the Tube off, it writes it in the I/O processor RAM, which is correct as I want it storing in the currently-in-use processor. But ...
by BeebMaster
Wed Dec 14, 2016 11:06 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

If I try to send or receive an F-code using OSWORD &72, command code &CA or &C8 then I get a Disc error &70. I wonder if it would be possible to trap the error and send it to some code which could simulate providing an F-code response. Maybe it could be done using the unknown OSWORD ...
by BeebMaster
Wed Dec 14, 2016 10:44 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Sounds plausible, I was wondering earlier why the National Disc would be looking for maps at start-up when it goes into the Domesday Gallery. The user code is a 6 byte text string beginning with a letter U, I don't know what those long numbers are. The National Disc side A user code is U1=986 and th...
by BeebMaster
Wed Dec 14, 2016 9:19 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Here's a *EX of the National Disc I made some years earlier: http://www.beebmaster.co.uk/Domesday/Pics/NatVFS2big.jpg http://www.beebmaster.co.uk/Domesday/Pics/NatVFS3big.jpg *INFO MAPDATA1 and *DUMP MAPDATA1 give a not found error. What sector is it reading when it looks for Mapdata1? Whereabouts o...
by BeebMaster
Tue Dec 13, 2016 10:36 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

It's the last shout for the Domesday Machine tonight before it all goes away again. The last thing I wanted to try was connecting the SCSI2SD board to the SCSI cable between the LV-ROM player and the Master AIV SCSI interface to see if the debug option would listen to the SCSI data going between the...
by BeebMaster
Sun Dec 11, 2016 10:56 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Right...I've solved that curiosity, it's if the last sector is only part of a sector long, it will load the final sector separately. If the file is an exact number of sectors in length (say a 16K ROM image) then it loads the whole lot in one operation.
by BeebMaster
Sun Dec 11, 2016 10:33 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

SCSI2SD is doing something very strange. I don't know whether it's ADFS doing this, or a feature of SCSI2SD. I turned on the debug log to see what was happening between a SHIFT-BREAK and the Mapdata1 not found error. The first part of each line is the SCSI op code, 3 bytes of start sector, 1 byte of...
by BeebMaster
Sun Dec 11, 2016 3:51 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Right...I've reconstructed the SD card image and told SCSI2SD where the different drives should start and re-done the dummy padding where there's sound on the laserdisc, which had been overwritten by the incorrect SD card mapping, so I'm back to where I should have been if that hadn't happened. It d...
by BeebMaster
Sat Dec 10, 2016 7:30 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Comparing the VFS technical information in chapter 6 of the AIV User Guide and the ADFS technical information in section J of the Reference Manual Part 1, there isn't any difference between the free space map and directory layout of the two filing systems. The only difference at all is that after th...
by BeebMaster
Sat Dec 10, 2016 6:35 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

Ahh - well yes - that could be right, although it does work fine with disc images made from a CF card/IDE hard drive, so I don't think it's necessarily a size-of-disc problem. Maybe there is something in the VFS free space map that is slightly non-standard that it doesn't like, but I haven't discove...
by BeebMaster
Sat Dec 10, 2016 6:18 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

I finished copying the Northern Side of the Community Disc this afternoon. I had to switch to my 2003 disc last night as I couldn't get past the error. I noticed that there is a Mapdata1 file on Community which isn't on National! None of the images I have made will mount with Fuse ADFS. However, the...
by BeebMaster
Sun Dec 04, 2016 10:14 pm
Forum: general
Topic: SCSI LUNs
Replies: 0
Views: 240

SCSI LUNs

I discovered earlier today that ADFS can mount "hard" drives 1, 2 and 3 (as well as 0) if these are presented to ADFS as Logical Unit Numbers on SCSI ID 0, rather than appearing as SCSI IDs 1, 2 & 3 which it doesn't seem to like. This was when using the SCSI2SD board by selecting the &...
by BeebMaster
Sun Dec 04, 2016 10:05 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

I got waylaid by a genuine disc error on the Community Disc that I can't get past and by an exciting diversion in a nearby thread involving connecting the LV-ROM player to the 1MHz bus but I've reassembled the Domesday Machine now ready to have another go at the copying. Just before doing that, I tr...
by BeebMaster
Sun Dec 04, 2016 9:59 pm
Forum: hardware
Topic: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter
Replies: 15
Views: 895

Re: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter

I've noticed in the bundle of files which contains the ADFS disassembly at MDFS.net there are tools to create-your-own-ADFS for SCSI, IDE, MMC etc. but also it looks like this would allow for changing of the hardware mapping for the SCSI interface - so we might be able to generate an ADFS which look...
by BeebMaster
Sun Dec 04, 2016 9:54 pm
Forum: past events & exhibitions
Topic: ABug North 18/19/20 November 2016, Bolton
Replies: 199
Views: 10893

Re: ABug North 18/19/20 November 2016, Bolton

That's good to know. I still haven't tried SoftMDFS, it hasn't even made it on to the to-do list yet.

I think I need a to-do-list-to-do-list !!
by BeebMaster
Sun Dec 04, 2016 5:18 pm
Forum: hardware
Topic: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter
Replies: 15
Views: 895

Re: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter

Well, I tried... I just discovered that you can copy a ROM using ADT with the MOVE command (AMOVE on a Master to avoid conflict with the MOS 3.20 command): *AMOVE 8000+4000 3000 13 Will copy ROM 13 (ADFS) into the main RAM at 3000, I only need to change one byte, &8BAE, ie &3BAE in the RAM c...
by BeebMaster
Sun Dec 04, 2016 4:34 pm
Forum: hardware
Topic: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter
Replies: 15
Views: 895

Re: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter

As far as I can see the "pause a bit" routine is this: 821B JSR &821E 821E RTS So it just does a couple of sort of nested jumps and then carries on. Given that we've only got 4 bytes to play with, what can we replace those 4 bytes with that might take longer? Actually going back a few ...
by BeebMaster
Sun Dec 04, 2016 3:30 pm
Forum: hardware
Topic: Domesday 30
Replies: 38
Views: 2137

Re: Domesday 30

I enjoyed the whole copying process so much that I thought I'd try again! This time I was a bit adventurous. I used the same disc, and the same SCSI2SD setup, except that by this point I'd worked out how to access ADFS hard drives 1, 2 and 3 - you have to use the "Map LUNs to SCSI ID" opti...
by BeebMaster
Sun Dec 04, 2016 3:07 pm
Forum: hardware
Topic: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter
Replies: 15
Views: 895

Re: Acorn SCSI Host Adapter Vs Acorn AIV SCSI adapter

Thanks for that, it has explained - but not solved - a long-standing mystery!

When you say we would have to slow down the ADFS DMA transfer rate, it that something which could be achieved using interrupt/event handling to slow the system down? Or would it need the ADFS code to be re-written?

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