Search found 2316 matches

by steve3000
Sun Jan 17, 2021 6:20 pm
Forum: programming
Topic: BBC BASIC detecting if it is being run on a BBC or Archimedes
Replies: 14
Views: 299

Re: BBC BASIC detecting if it is being run on a BBC or Archimedes

I've written a program in BASIC for the BBC Micro which I also want to run on an Archimedes emulator on a Raspberry Pi . On the Archimedes, the colour palette is different. Is there a command in BBC Basic that will return a unique result for BBC Micro so I can set one set of colours for the BBC and...
by steve3000
Wed Jan 13, 2021 1:11 am
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 139
Views: 5730

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

It also seems that RISC OS 3 simply doesn't like an A305. This is "a bit weird" since I did test RISC OS 3 on Arculator confugured as an A305, and it's fine there and I had understood that IanS had an A305 with RISC OS 3 running from ArcFlash, but I'm not sure now -- Ian? Has anyone else ...
by steve3000
Tue Jan 12, 2021 9:38 pm
Forum: 32-bit acorn hardware
Topic: A3000 Battery Damage
Replies: 15
Views: 389

Re: A3000 Battery Damage

The keyboard connectors aren't available any more. What I do (and anecodtally others successfully have also done) is replace the connector with a stanadrd 0.1" pin strip, then put these 'Clincher' connectors on the flexi. This also makes it much less scary removing the keyboard the next time y...
by steve3000
Mon Jan 11, 2021 11:49 pm
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 139
Views: 5730

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

Think you’ve got it. IIRC the lower half of the pages were used, upper ignored. There’s an interesting chunk of code in the RISC OS ROM that crunches through the different page size possibilities and determines the layout and memory size at boot up. Expect for multi-MEMC support added in RISC OS 2, ...
by steve3000
Sun Jan 10, 2021 10:00 pm
Forum: 32-bit acorn hardware
Topic: Transfer data between A3000 and RISCOS on Raspberry Pi
Replies: 7
Views: 262

Re: Transfer data between A3000 and RISCOS on Raspberry Pi

Unfortunately there is/was no standard for >1 ‘filecore’ partition under RISC OS, so BITD each IDE interface manufacture created their own different approach to provide multiple partitions, but even now RISC OS 5 doesn’t know about these, so still only looks for (and reads) the first partition. Does...
by steve3000
Sun Jan 10, 2021 9:48 pm
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 139
Views: 5730

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

Is the POSTbox incorrectly setting up a 4kb page size for 512kb, when it should be 8kb? Well: control = (0x036E0000 | os_mode << 12 | sound_dma << 11 | video_dma << 10 | refresh << 8 | high_rom_time << 6 | low_rom_time << 4 | page_size << 2) We pass in page_size = 0 for a 512K machine, setting 4K p...
by steve3000
Sun Jan 10, 2021 9:22 pm
Forum: for sale / freebies
Topic: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)
Replies: 139
Views: 5730

Re: FS: USB "POST box" adaptors (for debugging Archimedes / Risc PC systems that don't boot)

Is the POSTbox incorrectly setting up a 4kb page size for 512kb, when it should be 8kb?
by steve3000
Sat Jan 02, 2021 10:10 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

That ST506 reader looks interesting, and could be ideal, but I really think/hope it should be possible to read from software, if I can get past the first track... The solenoid clunk sounds fine and you can hear the heads move on power-up (sound clip above seems identical to YouTube clips of an ident...
by steve3000
Sat Jan 02, 2021 9:29 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

Oh dear, you've voided the warranty now! Oops :wink: with those hidden torx screws they really didn't want anyone getting in...! I am sure you will be able to do a direct disc sector read of the drive using a SYS ADFS_DiscOp loop to retrieve the contents. Should have been clearer above... That's ex...
by steve3000
Sat Jan 02, 2021 3:30 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

Ok, so still no luck with this RODIME ST506 HDD. I did take the plunge and pop it open for a peak (in our dust-minimised kitchen!) - but nothing blocking the movement of the heads, and the platters spin freely (photos attached - note the hidden screws under the label). So I've packaged it back up an...
by steve3000
Sat Jan 02, 2021 3:15 pm
Forum: 32-bit acorn hardware
Topic: The Risc PC SIMM compatibility chestnut - voltage issues - 3.3V dressed as 5V!
Replies: 5
Views: 285

Re: The Risc PC SIMM compatibility chestnut - voltage issues - 3.3V dressed as 5V!

Really interesting detective work Phil!

One question... you said "swapping in one of the 32MB modules sadly hasn't helped" - any thoughts why?
by steve3000
Wed Dec 30, 2020 12:15 am
Forum: 32-bit acorn software: other
Topic: ADFS Formatter
Replies: 5
Views: 321

Re: ADFS Formatter

I suppose in the world of disc images it would be impossible to feed it the equivalent of an unformatted disc so perhaps "formatting" an image file has been confined to laying out the filesystem structure Oh yes, very good point - this could be an emulation issue rather than RISC OS 5, de...
by steve3000
Tue Dec 29, 2020 9:53 pm
Forum: 32-bit acorn software: other
Topic: ADFS Formatter
Replies: 5
Views: 321

Re: ADFS Formatter

Well, it is because when ADFS formats the disc (or is it FileCore formats it?) it only initialises the disc (i.e. puts down the Boot Map, Disc Record, Allocation/Free Space Map, and Root directory) while leaving the rest intact. Interesting, I wonder if this is a RISC OS 5 "feature"? I've...
by steve3000
Tue Dec 22, 2020 10:19 pm
Forum: 32-bit acorn hardware
Topic: Identifying a RISC PC Motherboard
Replies: 2
Views: 192

Re: Identifying a RISC PC Motherboard

If those pictures are of your RiscPC, then you have a prototype! Both points you mention are the clues. The PCB issue "B" is a give-away since release versions were numbered. As is the VIDC20 chip in the photo marked "PROTO A USA" - this is not present on the release versions. Do...
by steve3000
Fri Dec 18, 2020 8:48 pm
Forum: 32-bit acorn software: other
Topic: BBC Archimedes - Last machine to teach BASIC in the User Guide?
Replies: 9
Views: 657

Re: BBC Archimedes - Last machine to teach BASIC in the User Guide?

There was a welcome guide that explained all the windows stuff... like how to hold a mouse :) http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_A3000WG.pdf That's the A3000 / RISC OS 2 user guide. I think only the A305/A310/A440 Arthur user guides went into the full details of BAS...
by steve3000
Thu Dec 17, 2020 9:35 pm
Forum: 8-bit acorn hardware
Topic: Write-up of Western Security floppy disc protection
Replies: 11
Views: 733

Re: Write-up of Western Security floppy disc protection

Wow, another mind-bending retro-protection write up! I really like the simplicity of this method, but as others have above, I wonder about ability to mass-produce. When I was (briefly) involved with copy protection on the Archimedes, the requirement was that the system had to be compatible with a di...
by steve3000
Fri Nov 20, 2020 9:36 pm
Forum: 32-bit acorn hardware
Topic: Acorn A3010 and Serial WiFi adapter
Replies: 8
Views: 390

Re: Acorn A3010 and Serial WiFi adapter

I did find that line. I found that even deleting it entirely made no difference [-X Ahh yes the pains of UniBoot... I thought that'd do the trick, but if not, things get more challenging because there are many other places it claims and releases RMA, it even creates a RAM disc for temporary use if ...
by steve3000
Fri Nov 20, 2020 6:34 pm
Forum: 32-bit acorn hardware
Topic: Acorn A3010 and Serial WiFi adapter
Replies: 8
Views: 390

Re: Acorn A3010 and Serial WiFi adapter

From memory...Look in “!Boot.Utils.BootRun”, you’ll find a line stating “AddToRMA 764k” (or similar), try reducing that until the Boot fails, then add back a bit.
by steve3000
Fri Nov 20, 2020 12:35 am
Forum: for sale / freebies
Topic: A540 RAM cards on eBay
Replies: 14
Views: 757

Re: A540 RAM cards on eBay

...clocked at 26MHz for that little bit faster experience :)
by steve3000
Thu Nov 19, 2020 12:04 am
Forum: 32-bit acorn software: classic games
Topic: Dune 2 on A3000
Replies: 12
Views: 503

Re: Dune 2 on A3000

"Bad screen mode" usually means not enough memory for the screen mode. So 4mb will certainly help, but first try changing to a larger memory screen mode, like MODE15, before starting...which could solve it straight away. Changing mode won't help the sound though. I've not played Dune II fo...
by steve3000
Mon Nov 16, 2020 2:12 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

I doubt it would be a fully RISC iX format drive, since RISC OS would hang for a minute each reboot, and with this being the only HDD in the computer, the previous owner would have had to load !RISCiX startup software off a floppy... but not impossible I suppose. From what I've heard about Risc iX,...
by steve3000
Sun Nov 15, 2020 11:38 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

There's no chance it's -just- a RiscIX format drive is there? That'd explain why ADFS barfs. The audio sounds better than an ST506 drive I recently got hold of that's working just fine, so don't worry about that. I would strongly advise against opening the drive - the tolerances on an ST506-era dri...
by steve3000
Sun Nov 15, 2020 11:34 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

Those are perfectly normal Rodime spin up and spin down noises. As it's been transplanted to a different machine, and the controller is in the machine rather than the drive, it might need reminding of its geometry with a mode select. I don't know how the Archimedes ST506 interface stores the disc g...
by steve3000
Sun Nov 15, 2020 5:49 pm
Forum: 32-bit acorn hardware
Topic: Software to image a ST506 hard disc?
Replies: 4
Views: 414

Re: Software to image a ST506 hard disc?

Thanks Ian! Just to follow up on this, the software in your zip "adfsread" looks perfect for the job, so I connected everything up ready to give this a go and powered the ST506 drive up for the first time in >20 years... and it sounded OK. Spun up, a few clicks, steady spin speed. :) But i...
by steve3000
Sun Nov 15, 2020 5:47 pm
Forum: 32-bit acorn hardware
Topic: ST506 HDD woes
Replies: 54
Views: 5918

Re: ST506 HDD woes

Bit of a thread resurrection here, but with a different ST506 drive, related to much of what is discussed above. (And I just realised that I started actually this thread, with a post about my A410/1 ST506 drive - so just to update, I never did get that drive working, but didn't take any drastic step...
by steve3000
Sun Nov 15, 2020 5:22 pm
Forum: 32-bit acorn hardware
Topic: Connor HDD "restoration"
Replies: 2
Views: 219

Connor HDD "restoration"

I've recently taken possession of two old HDDs from Archimedes - a Connor CP30100 100mb SCSI HDD from an A540 and a ST506 drive from an R140, both in unknown condition, and likely not used in >20 years. My hope was that the discs were in good operational condition and could be reused for a proper ea...
by steve3000
Sat Nov 14, 2020 12:07 pm
Forum: other vintage hardware, software and languages
Topic: Technomatic EpromRyter Power Cable Details
Replies: 7
Views: 539

Re: Technomatic EpromRyter Power Cable Details

I've also pulled out my "EpromRyter" to check but completely forgot that mine is not an EpromRyter, but the older Epromer II. It is same style as George's EpromRyter in the post here: https://stardot.org.uk/forums/viewtopic.php?f=3&t=8688 I can measure the voltages, but from above, it ...
by steve3000
Fri Nov 13, 2020 8:09 pm
Forum: 8-bit acorn software: classic games
Topic: Electron Exile 'Helper'
Replies: 28
Views: 1232

Re: Electron Exile 'Helper'

Finally got round to doing a compilable disassembly of Electron Exile, and was astonished to find the vertical stripes of code/data down the sides are no such thing ! They're just 'randomish' generated values. Wow. :shock: Not suggesting anything untoward, but as I read this, something in the way y...
by steve3000
Sun Nov 08, 2020 2:41 pm
Forum: 32-bit acorn software: classic games
Topic: Zarch variant with rising flying tone?
Replies: 9
Views: 582

Re: Zarch variant with rising flying tone?

Maye not the same thing, but I definitely recall playing Zarch on a very early A310 (or possibly A305) at a friend's house, in 1987... and there was a distinct loud interference buzz through the internal speaker which increased in pitch when the quantity of on-screen graphics reduced - so would have...
by steve3000
Fri Nov 06, 2020 12:44 am
Forum: archive submissions
Topic: RISC OS 3.71
Replies: 5
Views: 464

Re: RISC OS 3.71

Wow, that's a great find!

I've only had a quick peak but spotted a "3.60" directory in there, and a "Morris2" one - can it build any earlier versions, 3.70 or 3.60?

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