Search found 655 matches

by philpem
Mon Feb 22, 2021 12:13 pm
Forum: 32-bit acorn hardware
Topic: A4000 speaker inteference
Replies: 16
Views: 363

Re: A4000 speaker inteference

That's a 10uF capacitor. To be clear - C84 is a 10uF, or the little SMD parasite soldered onto C84 is 10uF? I was expecting the parasite/bodge to be somewhere in the picofarads or nanofarads range... You can bet I'm going to be checking my board for noise on IOR, IOW and POR now. This board has a t...
by philpem
Mon Feb 22, 2021 11:08 am
Forum: 32-bit acorn hardware
Topic: A4000 speaker inteference
Replies: 16
Views: 363

Re: A4000 speaker inteference

47 picofarads. Interesting. Which motherboard part number and revision is this? (it might have an "ED" suffix) Yeah, 47pF seems a bit trivial to me. They must have thought it worth the effort though. Just an EMC thing maybe? It would still have an effect on rise and fall times -- and nois...
by philpem
Mon Feb 22, 2021 3:20 am
Forum: 32-bit acorn hardware
Topic: A4000 speaker inteference
Replies: 16
Views: 363

Re: A4000 speaker inteference

47 picofarads. Interesting. Which motherboard part number and revision is this? (it might have an "ED" suffix)

I'm definitely going to see if this helps out with the I/O issues I had when overclocking my A4000...
by philpem
Fri Feb 19, 2021 3:24 pm
Forum: archive submissions
Topic: Winter Olympiad 88: 40T side mis-master, revealing copy protection 6522 simulator?!
Replies: 5
Views: 229

Re: Winter Olympiad 88: 40T side mis-master, revealing copy protection 6522 simulator?!

That looks like tokenised BASIC with a chunk of assembler code. Interesting!

I was going to take a look, but I can't remember the name of the BASIC detokeniser I used to use... there are a few around though.
by philpem
Thu Feb 18, 2021 10:16 am
Forum: 32-bit acorn hardware
Topic: A4000 speaker inteference
Replies: 16
Views: 363

Re: A4000 speaker inteference

Maybe: https://stardot.org.uk/forums/viewtopic.php?qf=16&t=17310 Interesting, I’d missed that one from Phil, and my A4000 is beginning to get a bit crackly. I’ll investigate refitting it’s audio board and remove the filter at the same time :) That fix is mostly applicable if the board has been ...
by philpem
Tue Feb 16, 2021 11:20 pm
Forum: wanted
Topic: Wanted - Imagery by PaletteStudio / Stallion Software
Replies: 0
Views: 85

Wanted - Imagery by PaletteStudio / Stallion Software

Does anyone happen to have a spare disk set for "Imagery" by PaletteStudio? It was apparently distributed by Stallion Software of Bath. (I've asked on Archive Requests but I wonder if someone might have a copy and not have the facilities to image the discs...!) I've just picked up a copy o...
by philpem
Mon Feb 15, 2021 8:26 am
Forum: other vintage hardware, software and languages
Topic: Economatics Smartbox SB-04
Replies: 95
Views: 5884

Re: Economatics Smartbox SB-04

Phipli wrote:
Mon Feb 15, 2021 4:58 am
Yes please!

Are you able to image it and share?
Here you go - enjoy!
by philpem
Mon Feb 15, 2021 3:40 am
Forum: wanted
Topic: WTD: 5.25-inch alignment floppy disk
Replies: 0
Views: 86

WTD: 5.25-inch alignment floppy disk

Is anyone looking to sell an alignment floppy for 5.25in drives? I'm after the Analog Alignment Disk type -- usually branded Accurite, Dysan or Dymek. They're sometimes called "CE disks", or are simply labelled "Alignment Disk". Either 48tpi (40 track) or 96tpi would be fine, but...
by philpem
Mon Feb 15, 2021 3:31 am
Forum: other vintage hardware, software and languages
Topic: Economatics Smartbox SB-04
Replies: 95
Views: 5884

Re: Economatics Smartbox SB-04

While we're on the subject of Economatics kit... I picked up a disk containing Economatics Logicator in a box of random Archimedes floppies. It complains about not being able to communicate with the control box -- which I assume would be the Smartbox. It looks like a flowchart-based control system b...
by philpem
Sun Feb 14, 2021 2:15 am
Forum: wanted
Topic: ArcVenture II and Plantwise by Sherston
Replies: 1
Views: 108

ArcVenture II and Plantwise by Sherston

Does anyone happen to have a copy of ArcVenture II or Plantwise by Sherston going spare? For Arcventure II, I have the Work Disc only and need the rest of the pack. For Plantwise I have the manuals, worksheets and two discs, but I'm missing (at the very least) Disc 1 -- so need the remaining disc (o...
by philpem
Sun Feb 14, 2021 2:12 am
Forum: archive requests
Topic: Looking for "Imagery" by PaletteStudio
Replies: 0
Views: 69

Looking for "Imagery" by PaletteStudio

Does anyone happen to have a spare disk set for "Imagery" by PaletteStudio -- apparently distributed by Stallion Software of Bath.

Just picked up a copy on ebay for grins and it turns out the previous owner copied Disc 2 over Disc 1... :shock: :evil: :?

Cheers
Phil
by philpem
Sat Feb 13, 2021 2:30 am
Forum: 32-bit acorn hardware
Topic: Another A4 lives \:D/
Replies: 2
Views: 205

Re: Another A4 lives \:D/

Nice work!

It's parked for the moment - I have the parts, but have been too busy with the software preservation work to sit down and bash out a PCB design.

My game plan was to redesign Theo's card with a more recent CPLD chip -- and do a mini-Podule version for the A4000.
by philpem
Fri Feb 12, 2021 1:38 am
Forum: 32-bit acorn hardware
Topic: A7000+ failed IDE - fixed!
Replies: 32
Views: 761

Re: A7000+ failed IDE

If it were my board, my next step would be to remove the floppy and IDE connectors and check for broken tracks underneath them. Check as close to everything as possible. It wouldn't surprise me if a bus control line or chip select went under there... Otherwise I fear you might be in the same circle ...
by philpem
Wed Feb 10, 2021 1:41 pm
Forum: 32-bit acorn hardware
Topic: Is this really what we ought to be doing?
Replies: 8
Views: 519

Re: Is this really what we ought to be doing?

Actually that is a modification that is OK to my mind. The FDD is an upgrade and will still load the original discs. It will also use the 1.6Mb discs and so make transfer of software between an A3000 and A5000 (say) easier. There is one drawback, however. A disc cloner such as !Pirat will not work ...
by philpem
Wed Feb 10, 2021 10:59 am
Forum: 32-bit acorn hardware
Topic: Is this really what we ought to be doing?
Replies: 8
Views: 519

Re: Is this really what we ought to be doing?

You'll probably want to crucify me for what I did then... putting a high-density floppy controller and a 1.6MB drive in an A3000...
by philpem
Mon Feb 08, 2021 4:44 pm
Forum: risc os software preservation
Topic: (Advanced tips) Cleaning floppy discs
Replies: 2
Views: 136

Re: (Advanced tips) Cleaning floppy discs

Every old trick is new again! :D
by philpem
Mon Feb 08, 2021 12:56 pm
Forum: 32-bit acorn hardware
Topic: CMOS Chip pin 7 NC?
Replies: 9
Views: 174

Re: CMOS Chip pin 7 NC?

Ah! Thanks, that all makes sense. I kept thinking it might be Test Pad but couldn't find any reference to it. Am I right in thinking there is a set of test points together somewhere on the board? Test points could be anywhere - but with Acorn boards they're usually close to the component they 'tap'...
by philpem
Mon Feb 08, 2021 12:51 pm
Forum: risc os software preservation
Topic: (Advanced tips) Cleaning floppy discs
Replies: 2
Views: 136

(Advanced tips) Cleaning floppy discs

I first spotted this trick on a Youtube video by ClassicRetroGamer -- https://www.youtube.com/watch?v=MPSqwaeMxTE. This is pretty good for dealing with floppies which have been stored in sub-optimal conditions (damp lofts, warehouses or garages for instance) 3.5in discs (and general hints) The name ...
by philpem
Mon Feb 08, 2021 12:21 pm
Forum: 32-bit acorn hardware
Topic: CMOS Chip pin 7 NC?
Replies: 9
Views: 174

Re: CMOS Chip pin 7 NC?

OK that keeps it easy. Thanks, Ian. Do we know what TP1 stands for? Just trying to make sense of this. TP1 is a test point, which gives access to the interrupt signal from the RTC. I haven't checked how RISC OS configures it, but it may be a square wave or periodic pulse. In which case it can be us...
by philpem
Mon Feb 08, 2021 1:59 am
Forum: 32-bit acorn hardware
Topic: Is this really what we ought to be doing?
Replies: 8
Views: 519

Re: Is this really what we ought to be doing?

I don't mind so much about installing the Gotek, that's fair enough. But selling the machine with hundreds of probably-pirated games is a bit rich!
by philpem
Sun Feb 07, 2021 12:50 am
Forum: 32-bit acorn software: classic games
Topic: backing up my games?
Replies: 23
Views: 789

Re: backing up my games?

Sorry I am little lost. I downloaded after advice ADFFS and have been using ADF disc images. What's APD? and JPD? How do I read a disc under them? I don't see any of those options in the menus for ADFFS? Once I have an APD or JPD how do I then use that on my real Archimedes? To list them all... - A...
by philpem
Thu Feb 04, 2021 11:19 pm
Forum: 32-bit acorn software: classic games
Topic: backing up my games?
Replies: 23
Views: 789

Re: backing up my games?

I tried and some of my games work, others not. For example Quark ADF file, when loaded still tries to use real floppy and says please insert disk xxxx. Actually quite a few are like this so does anyone know what the issue is and how to resolve? I have to admit back in the day I would have hacked th...
by philpem
Thu Feb 04, 2021 2:06 am
Forum: 32-bit acorn software: classic games
Topic: backing up my games?
Replies: 23
Views: 789

Re: backing up my games?

Just as a quick note from the preservation side -- if the game isn't supported by JASPP, your best bet is probably a Greaseweazle and a good-quality 3.5in floppy drive with clean, well-aligned heads. SCP files store the raw data from the disc and can be converted to HFE (which can be loaded into a G...
by philpem
Tue Feb 02, 2021 5:32 pm
Forum: 32-bit acorn hardware
Topic: I (Also) Overclocked My A3010
Replies: 24
Views: 747

Re: I (Also) Overclocked My A3010

In my case, any overclock on the A4000 caused it. Did you upgrade to faster RAM? Thats the benefit of the A3010 - the RAM seems to be the speed limit, and a 4MB upgrade in an A3010 disables the onboard RAM. Yep, I did. There's a 4MB fast RAM module plugged in, which plugs into the RAM-size-select j...
by philpem
Mon Feb 01, 2021 10:20 am
Forum: 32-bit acorn hardware
Topic: I (Also) Overclocked My A3010
Replies: 24
Views: 747

Re: I (Also) Overclocked My A3010

Copying a big ZIP file to a RAM drive with the Filer and unpacking it with SparkFS was usually enough to provoke it. Unzipping is quite processor intensive - is this just people pushing their overclock too far? I have a Gotek and an IDE interface in mine at the moment, is there something specific y...
by philpem
Mon Feb 01, 2021 2:31 am
Forum: 32-bit acorn hardware
Topic: I (Also) Overclocked My A3010
Replies: 24
Views: 747

Re: I (Also) Overclocked My A3010

Has anyone tested disk access on their overclocked machine? I saw issues where floppy disk reads and writes ended up corrupted when the machine was overclocked. Copying a big ZIP file to a RAM drive with the Filer and unpacking it with SparkFS was usually enough to provoke it. Admittedly this was on...
by philpem
Fri Jan 29, 2021 10:36 pm
Forum: for sale / freebies
Topic: Worth Taking a Look At
Replies: 2948
Views: 386533

Re: Worth Taking a Look At

e668ecp wrote:
Fri Jan 29, 2021 8:59 pm
https://www.ebay.co.uk/itm/Acorn-BBC-Mi ... 890.l49292

Someone is going to be disappointed.. look carefully
Depends if they want to use floppy disks... if it's being sold as an MMC-card only machine...
by philpem
Tue Jan 26, 2021 5:47 pm
Forum: 32-bit acorn hardware
Topic: A3000 CMOS - Successful replacement
Replies: 1
Views: 128

Re: A3000 CMOS - Successful replacement

Congratulations on a successful repair!

As you say it's best to take the motherboard out to do this replacement -- mostly because it's easier to remove the old chip and desolder the legs when you have access to the bottom. Well done for proving you can solder one in from the top too!
by philpem
Tue Jan 26, 2021 8:59 am
Forum: 32-bit acorn hardware
Topic: Reborn A540 - How to configure IDE / SCSI
Replies: 21
Views: 551

Re: Reborn A540 - How to configure IDE / SCSI

arkleyjoe wrote:
Tue Jan 26, 2021 8:38 am
with reference to . . .
Pernod wrote:
Mon Jan 25, 2021 8:12 pm
The blank line with *podules suggests it's been partially detected, but the ROM is not responding to deliver the podule details.
So I know where are I am looking, are we talking about the Risc OS Rom or a ROM on the SCSI podule?
The ROM on the SCSI podule.
by philpem
Tue Jan 26, 2021 8:52 am
Forum: 32-bit acorn hardware
Topic: Replacement 20mm mouse balls
Replies: 40
Views: 5416

Re: Replacement 20mm mouse balls

I know this is cracking on for 6 months old or so but does anyone have any spare 20mm balls? I've successfully replaced the cable on my mouse (with the pre-wired RS Components 9-pin minidin lead) and whilst it now moves up and down fine if I turn the roller with my finger, clearly the cracked/hard ...

Go to advanced search