Search found 1690 matches

by steve3000
Sun Aug 27, 2017 6:35 am
Forum: software
Topic: RISC PC - What version of RISC OS do you use?
Replies: 8
Views: 433

Re: RISC PC - What version of RISC OS do you use?

The only issue I recall having, was finding a softloader that worked for all ROM's. Jon, I'd be really interested to know which softloader you used in the end? I tried to achieve this set up a year or two ago, but gave up because I couldn't find a softloader which worked for all... It'd be great to...
by steve3000
Sat Aug 26, 2017 11:05 pm
Forum: hardware
Topic: Simple DIY method to get unfiltered high quality sound on your Archimedes!
Replies: 5
Views: 305

Re: Simple DIY method to get unfiltered high quality sound on your Archimedes!

That looks really cool and simple for most machines.... Thanks Paul, definitely simple for the big-box machines, and really worth while :) I have a slightly unrelated question... Is that A5000 an Alpha with a fifth column ROM??? If so, what's in the ROM? No, not an A5000 alpha (although it is moder...
by steve3000
Sat Aug 26, 2017 11:00 pm
Forum: hardware
Topic: Simple DIY method to get unfiltered high quality sound on your Archimedes!
Replies: 5
Views: 305

Re: Simple DIY method to get unfiltered high quality sound on your Archimedes!

Second example: following "Method 2" to modify an A3010. First open the cover and find the sound circuitry, shown here. tn_01 DSC_4431.JPG Here we see electrolytic capacitors C60 and C68 on the right hand side and LM324 op-amp chip on the vertically mounted audio board in the centre of th...
by steve3000
Sat Aug 26, 2017 10:39 pm
Forum: hardware
Topic: Simple DIY method to get unfiltered high quality sound on your Archimedes!
Replies: 5
Views: 305

Re: Simple DIY method to get unfiltered high quality sound on your Archimedes!

First example: following "Method 1" to modify an A5000. First open the cover and find the sound circuitry (I've highlighted this with a red rectangle). tn_A5k_01 sound circuit.JPG Here we see electrolytic capacitors C19 and C21 (light blue), and aux. sound connector LK3 in the centre of t...
by steve3000
Sat Aug 26, 2017 10:27 pm
Forum: hardware
Topic: Simple DIY method to get unfiltered high quality sound on your Archimedes!
Replies: 5
Views: 305

Simple DIY method to get unfiltered high quality sound on your Archimedes!

First a bit of background: I've always found it frustrating that the standard audio output from the Archimedes sounds rather muffled, even when playing very high quality samples/music. The reason for this was Acorn's choice of aggressive low-pass sound filter, which strips out the high frequencies,...
by steve3000
Sat Aug 26, 2017 8:26 pm
Forum: hardware
Topic: A680s
Replies: 16
Views: 689

Re: A680s

I think I have at least one spare VIDC somewhere (probably some MEMCs and IOCs too) but, in any case, CJE still stock them: http://www.cjemicros.co.uk/micros/individual/newprodpages/prodinfo.php?prodcode=VLSI-ARM-VIDC Would be great if between the community we could restore some of these, I'd be mo...
by steve3000
Sat Aug 26, 2017 8:19 pm
Forum: hardware
Topic: A680s
Replies: 16
Views: 689

Re: A680s

Really interesting to see these photos. The boards are clearly in varying states of configuration, as you say, it looks like at least one might be in a state which could function. To get the others working may/may not be possible, but would certainly need some time and effort to compare with the mos...
by steve3000
Sat Aug 26, 2017 6:42 am
Forum: hardware
Topic: Resurrecting A5000
Replies: 41
Views: 1217

Re: Resurrecting A5000

Hi, welcome to the forum! I must say, looking at those pictures of your CMOS RAM/RTC chip and surrounding circuitry, the damage doesn't look bad (at least compared to some of the thoroughly corroded Archimedes I've rescued in the past), so I'd say you've definitely got a good chance to get yours run...
by steve3000
Fri Aug 25, 2017 7:23 pm
Forum: hardware
Topic: A680s
Replies: 16
Views: 689

Re: A680s

Also interested, particulary if you think it's likely the faults or damage are repairable.

I'd hope between the forum the would be enough parts to resurrect more than one of these rarities and if successful possibly one (or more) could end up in a retro computer museum...
by steve3000
Fri Aug 18, 2017 11:19 pm
Forum: hardware
Topic: Vectorlight's A3010 IDE mod : step by step guide
Replies: 60
Views: 2478

Re: Vectorlight's A3010 IDE mod : step by step guide

Could you softload ADFS from RISC OS 3.5/.6/.7/.71 onto a RISC OS 3.1x machine? If so wouldn't this version of ADFS be more forgiving about the type of CF card or spinning rust? Good idea, but doesn't work unfortunately, as the RiscPC (which runs RO 3.5 and later) uses a different floppy/ide contro...
by steve3000
Fri Aug 18, 2017 11:18 pm
Forum: hardware
Topic: Vectorlight's A3010 IDE mod : step by step guide
Replies: 60
Views: 2478

Re: Vectorlight's A3010 IDE mod : step by step guide

Trapper wrote:I assume this hack still will not work with an Adelaide? Can you remove the Adelaide and replace it with a standard ARM250?

Works fine with Adelaide, just a bit less space under the lid. The SuperIO floppy and ide controller (82C710) chip is completely separate to the Arm250/Adelaide.
by steve3000
Sun Aug 13, 2017 10:15 am
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

And finally, here are the default ColourCard Gold mode definitions for multiscan monitors, provided in the "AcornMulti" module: MODE Physical bpp Video Hfreq FPS no. X Y (MHz) (kHz) (Hz) 88 512 511 4 24 25.42 81.4 89 512 511 8 24 25.42 81.4 90 768 575 4 24 25.42 81.4 91 768 575 8 24 25.42 ...
by steve3000
Wed Aug 09, 2017 10:55 pm
Forum: off-topic
Topic: Extending an olive branch?
Replies: 16
Views: 698

Re: Extending an olive branch?

trixster wrote:I feel his presence, enthusiasm and knowledge are missed from stardot. I've had plenty of dealings with him on and off the forum and he's a genuinely great chap.

I don't know exactly what happened, but completely agree with the above [-o<
by steve3000
Tue Aug 08, 2017 11:21 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

And here are the default ColourCard Gold mode definitions for "high-end"-monitors, provided in the "Taxan795" module: MODE Physical bpp Video Hfreq FPS no. X Y (MHz) (kHz) (Hz) 88 512 511 4 24 25.42 81.4 89 512 511 8 24 25.42 81.4 90 768 575 4 24 25.42 81.4 91 768 575 8 24 25.42 ...
by steve3000
Tue Aug 08, 2017 10:59 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

They all check out on my machine - only difference is that my monitor always rounds down whereas you correctly round up when required. (Where the 1bpp/2bpp/4bpp/8bpp modes formed a set with the same rates, I only checked the first one.) Strangely, my monitor won't report the line and frame rate for...
by steve3000
Tue Aug 08, 2017 10:11 pm
Forum: hardware
Topic: 32 bit Fault finding index
Replies: 16
Views: 1409

Re: 32 bit Fault finding index

Great advice Paul, and coincidentally I have just had the very same fault from my A5000 - indeed I've just been interrogating your Web pages to decode the floppy POST message :)

Another job for the weekend...
by steve3000
Mon Aug 07, 2017 11:49 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Here's my decoded information for the full range of iSV VividGold screen modes for the ColourCard Gold. If anyone spots errors here, let me know and I'll correct the table :) MODE Logical Physical bpp Video Hfreq FPS no. res. X Y (MHz) (kHz) (Hz) 18 640x512 640 512 1 36 42.85 80.3 19 640x512 640 512...
by steve3000
Sun Aug 06, 2017 11:41 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Monitor says 36.6KHz / 82Hz for 32K colours, 40.3KHz / 90Hz for 256 colours and below. Thanks! This compares very nicely to my calculations :) http://stardot.org.uk/forums/download/file.php?id=31268 I'll finalise my table of all data for the iSV mode definitions tomorrow, and post this up here. I'l...
by steve3000
Sun Aug 06, 2017 7:33 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

If you need me to test anything, just let me know. :) Any chance you could post up the line rate and frame rate for the 15bpp 576x424 iSV mode? 15 bpp modes are defined differently to the others, I think I've worked them out - but I'm getting different line rates and frame rates compared to the equ...
by steve3000
Sun Aug 06, 2017 8:14 am
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Excellent. So I should now have what I need to programme this, just need to put it into practice :)
by steve3000
Sat Aug 05, 2017 10:34 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Rob, based on the 800x600 rates you gave above, I've determined the base frequency of the clock feed to the G332 on the ColourCard as 6MHz, this is then multiplied up by a PLL multiplier to set the pixel rate for each mode definition. To check my calculation of the base frequency, I've calculated th...
by steve3000
Fri Aug 04, 2017 10:50 pm
Forum: off-topic
Topic: Detecting mosquitoes and kill them
Replies: 50
Views: 1160

Re: Detecting mosquitoes and kill them

Yikes, wouldn't wish that image on anyone... :shock:
by steve3000
Fri Aug 04, 2017 10:10 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Thanks for the link Rob, exactly what I was looking for! I had been delving into the only source code I could find for programming the G332 ( here ) but the data book alongside the source certainly makes life a lot easier! If you could post up the colourcard vsync rate for 800x600 at 16 and 256 colo...
by steve3000
Fri Aug 04, 2017 9:52 pm
Forum: off-topic
Topic: Detecting mosquitoes and kill them
Replies: 50
Views: 1160

Re: Detecting mosquitoes and kill them

One word: Marmite.

Usually airborne insects target me at the first opportunity. However on the recommendation of a friend, I did a week of marmite on toast for breakfast, before backpacking through south east Asia. Only two mosquitos dared to bite. :)
by steve3000
Fri Aug 04, 2017 6:48 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Brilliant, thanks Rob. I've thought the same about the iSV modules...and so I reverse engineered one this afternoon :) Now I've got a fair idea how to add new modes to the card :mrgreen: It looks like it uses standard VIDC and RISC OS mode variable settings, set to a low refresh rate, along with a t...
by steve3000
Fri Aug 04, 2017 9:14 am
Forum: hardware
Topic: Vectorlight's A3010 IDE mod : step by step guide
Replies: 60
Views: 2478

Re: Vectorlight's A3010 IDE mod : step by step guide

I was wondering if the overclocking might make some games unplayable though. For instance, I've got a copy of Speedball for the PC which was designed for old DOS based PCs, and when you play it on a modern PC it goes so fast you can't even see it move. Is that likely to be the case for any Archimed...
by steve3000
Fri Aug 04, 2017 8:57 am
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

I haven't had any luck with the passthrough on mine (in an A5000). I'm thinking there might be some re-processing of the sync signals, perhaps changing the polarity to match the CC configuration?...or, as you say, it might need a re-wired cable specific for the pass through. I think the card was or...
by steve3000
Fri Aug 04, 2017 8:51 am
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Useful information, thanks Mark. Unfortunately the first problem is lack of information - the Colourcard manual doesn't give either the V or H refresh rates. So although most of the resolutions sound fine (800x600, 640x480, 1024x768, 1280x1024...along with a few less common ones) the only one I've h...
by steve3000
Thu Aug 03, 2017 11:08 pm
Forum: hardware
Topic: ColourCard (Gold) on the Archimedes
Replies: 27
Views: 1137

Re: ColourCard (Gold) on the Archimedes

Great - and thanks for the tip about VividGold. Looks like they defined some new screen modes for the ColourCard - this will be really useful to reverse engineer, if it turns out no one has kept any technical information about defining modes on the ColourCard... (something for a rainy weekend!)
by steve3000
Thu Aug 03, 2017 10:59 pm
Forum: hardware
Topic: BBC A3000 + Watford Electronics ARM3 - installation woes
Replies: 24
Views: 779

Re: BBC A3000 + Watford Electronics ARM3 - installation woes

Good news everyone! It seems you were spot on steve3000 ... the oscillator circuit was dead (one of the flip flops of the 74ACT74 was bad). Exchanged the 74ACT74 with a new one (and socketed and replaced the oscillator in the same go) and boom - RISC OS 3 is working with the ARM3 upgrade. Great new...

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