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It's probably missing a number of modules that are loaded from disc. Arthur / RISC OS development ROMs are like that. It is, and that A500 is sitting on my desk at the moment (on loan from Xavier). I think the full HDD image is on doomsday86.com, it chugs away on boot up, loading the modules. Would...

I've still got a freezing issue with one A4, which does "settle out" after about 10mins of being powered up, strangely enough. Still digging in to that. My RTC battery had made a bad mess of the board, so I'm replacing more components around that area as it's simple to do before a more detailed dig...

Also depends really what you want to debug... If a desktop application or standalone utility, for example, then yes DDE is what you need. But if a single tasking game or demo directly writing to the screen outside of OS routines, then you need something like Hacker or DesktopHacker, which works well...

Notice the pause part-way through the font rendering. It's completely random. Never seen any broken behaviour, all software works as it should, it's just these freezes. Not had time to do much probing yet, but I'm going to guess some kind of missing or jittery interrupt. The freezing/unfreezing is ...

Ah ok, but I would suggest that, as the vast majority of A5000s shipped with RO3.10 or RO3.11 from the factory, that this should really be the default, in that case? Fair enough, I'm not intimate with the various RISC OS versions so wasn't aware that 3.00 was buggy. I'll replace with 3.11. :) I'm s...

3) HCCS Ultimate - Vision micropodule (bare, no software or manual) - £10 + P&P Link to details here : http://chrisacorns.computinghistory.org.uk/32bit_UpgradesH2Z/HCCS_Vision_Micro.html I could be interested in 2 and 3... First want to check - are you sure you have definitely not got software for ...

All machines currently default to the OS they were originally shipped with. Ah ok, but I would suggest that, as the vast majority of A5000s shipped with RO3.10 or RO3.11 from the factory, that this should really be the default, in that case? RISC OS 3.0 was only shipped for about 5-6 months in the ...

Have you tried the MAME debugger? Archimedes emulation is not considered complete but should be good enough for your purposes. Now MAME is something I'd not considered, and didn't realise it had a debugger... I'll look into this. Thanks :) MAME Debugger works a treat! I've spent an hour playing wit...

Pernod wrote: ↑

Sat Aug 01, 2020 10:30 pm

Have you tried the MAME debugger? Archimedes emulation is not considered complete but should be good enough for your purposes.

Now MAME is something I'd not considered, and didn't realise it had a debugger... I'll look into this. Thanks

kieranhj wrote: ↑

Sat Aug 01, 2020 7:04 pm

If you want to write the debugger Steve, I know we’d all be grateful!!

Although I did actually write a reasonably complete ARM2 emulator on the RiscPC back in 1998, which could serve as a start point...

Even the earlier A5000, A30x0, A4, etc. running RISC OS 3.1 all detect a connected VGA/SVGA monitor and select 640x480@60Hz, 31.5khz, after a CMOS reset, if the PCB is working. So the Risc PC running RISC OS 3.5 or later will be doing this, if the CMOS reset is completing correctly (ie. holding Del ...

...the main problem I face is forcing the PCs to output in a 31khz or greater resolution. I saw a post some time ago by Z80 about shorting pins to force the mode change - unfortunately no avail. I have a cheap CGA-VGA converter board (GBS8200-compatible) that works but fails to sync lock - I also f...

Ah, that's a shame, but thanks for confirming Sarah!

I'd like to trace some of the inner workings of the RISC OS 3.1 ROM during self test and startup code - so I'm wondering if any of the available Archimedes emulators contain (or can have enabled) debug tools which allow breakpoints/watch points/register dumps/etc. to be set. Does anyone know?

Arcadian wrote: ↑

Sat Aug 01, 2020 10:09 am

I believe sydney has pm'd steve with the zoom details (or is about to) ...

Thanks all, PM received, I'll be joining tonight!

I can rarely attend these due to family commitments at weekends and I expect probably too late notice, but I am now free tonight and if any evening spaces, or drop-outs, I'd like to attend Phil (myelin's) presentation...

Is there any initialisation trick required to get > 4 logical drives to be supported, or is this a limitation of Wizzo IDEFS (which would then be a subject for trying to hack/fix) ? The IDEFS module just doesn't support that number, that's all. I suspect reason is thay IDEFS is following Acorn File...

philpem wrote: ↑

Wed Jul 29, 2020 9:07 pm

IanJeffray wrote: ↑

Wed Jul 29, 2020 8:14 pm

... if the source is ever found and released.

I created a pretty reasonable disassembly of ICS IDEFS v3.06 and v3.15 a while ago and commented key routines. Shouldn’t be hard to reverse engineer Wizzo with these as start points, since it is clearly based on ICS IDEFS. I’ll add that to my list...

Great result... if a little random! Wizzo IDEFS loaded whilst ADFS is also still configured for the HDD means two icons - scary they both manage the same disk at the same time. Don’t do this - they’re not managing the disc at the same time, they’re independently assuming they both own it - and your ...

Finally I have got the Arcflash v2 board running in my A540 :D (thanks myelin for the help, and the Arcflash!) The A540 uses reversed ROM order, so needed a rebuild of the standard ROM, with byte order reversed (like the A5000), but the fitment is the same as the earlier Archimedes, so no adaptor ne...

Hi Folks, I have just acquired a 3" CF-2 floppy drive for my Beeb along with some still sealed CF-2 disks. It is a Crescent 401 by a company called Servicon Dynamics Ltd. The drive is like new and after replacing the drive belt is working beautifully with Acorn DFS and ADFS. The sheet that came wit...

Nicely solved. I saw your first post and was thinking bits 0-3 for red... you’d probably have found not all screen modes would have worked correctly either as the control register would have been set incorrectly for DMA timing...

philpem wrote: ↑

Mon Jul 27, 2020 2:50 am

Sadly LCDGameModes is RISC OS 3.10 only.

Humm that reminds me I really should include the LCDGameModes MDF in the release archive... I'll dig out my RiscPC at the weekend and locate LCDGameModes definitions MDF.

Wow, that is impressive and from such a compact piece of BASIC - a nice little demo effect! It reminds me of a much simpler but larger (I think?) spinning ball demo, possibly a type-in from Micro User BITD (wasn't the Beebug one above). It took a very long time to render, so I remember 'optimising' ...

IC48 is incorrectly labelled as 74LS85 just below the RGB connector. Elsewhere in the UHF circuitry it is correctly labelled as 74LS86.

I have a SCART cable with the +5V wired into the scart plug at the tv end from the tv usb socket. If your disaply has a usb socket, it works well. I've just borrowed this idea, thanks Ian! My previous SCART setup picked up +5v from the A3000 expansion connector, but this morning I needed to connect...

Very interesting... with OS 0.1 fitted to the same computer, the relay tick between blocks is very faint, almost inaudible. Swapping OS 1.2 back in to check, and as before, the relay gives a much louder click between blocks when cataloguing or loading. No noticeable flicker in the cassette LED with ...

On my Issue 2 model A, OS 1.2, there is a loud relay click between each block as it catalogues and loads, but no noticable flicker of the cassette LED between blocks (or between files).

Will check OS 0.1 next.

IanJeffray wrote: ↑

Fri Jul 24, 2020 11:33 pm

the 711 plays no part in the IDE.

The 82C711 is the IDE/Serial/Parallel/Floppy multi-IO controller on the A4. Ref: https://www.chiark.greenend.org.uk/~the ... 82c711.pdf

I'd be tempted to bypass the transformer and regulators, and feed regulated +5 and +/-12V in the appropriate testpoints on the PCB. I think the A30x0 only needs +5v, and -5v for sound. Would be a good solution to have a power brick and feed in DC...and removes any chance of transformer humm often f...